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class="vector-toc-numb">2</span> <span>Standards development</span> </div> </a> <button aria-controls="toc-Standards_development-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Standards development subsection</span> </button> <ul id="toc-Standards_development-sublist" class="vector-toc-list"> <li id="toc-Two-_and_four-pair_Ethernet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Two-_and_four-pair_Ethernet"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Two- and four-pair Ethernet</span> </div> </a> <ul id="toc-Two-_and_four-pair_Ethernet-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Single-pair_Ethernet" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Single-pair_Ethernet"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Single-pair Ethernet</span> </div> </a> <ul id="toc-Single-pair_Ethernet-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Uses" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Uses"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Uses</span> </div> </a> <ul id="toc-Uses-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Terminology" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Terminology"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Terminology</span> </div> </a> <button aria-controls="toc-Terminology-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Terminology subsection</span> </button> <ul id="toc-Terminology-sublist" class="vector-toc-list"> <li id="toc-Power_sourcing_equipment" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Power_sourcing_equipment"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>Power sourcing equipment</span> </div> </a> <ul id="toc-Power_sourcing_equipment-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Powered_device" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Powered_device"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Powered device</span> </div> </a> <ul id="toc-Powered_device-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Power_management_features_and_integration" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Power_management_features_and_integration"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Power management features and integration</span> </div> </a> <button aria-controls="toc-Power_management_features_and_integration-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Power management features and integration subsection</span> </button> <ul id="toc-Power_management_features_and_integration-sublist" class="vector-toc-list"> <li id="toc-Integrating_EEE_and_PoE" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Integrating_EEE_and_PoE"> <div class="vector-toc-text"> <span class="vector-toc-numb">5.1</span> <span>Integrating EEE and PoE</span> </div> </a> <ul id="toc-Integrating_EEE_and_PoE-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Standard_implementation" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Standard_implementation"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Standard implementation</span> </div> </a> <button aria-controls="toc-Standard_implementation-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Standard implementation subsection</span> </button> <ul id="toc-Standard_implementation-sublist" class="vector-toc-list"> <li id="toc-Powering_devices" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Powering_devices"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.1</span> <span>Powering devices</span> </div> </a> <ul id="toc-Powering_devices-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Configuration_via_Ethernet_layer_2_LLDP" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Configuration_via_Ethernet_layer_2_LLDP"> <div class="vector-toc-text"> <span class="vector-toc-numb">6.2</span> <span>Configuration via Ethernet layer 2 LLDP</span> </div> </a> <ul id="toc-Configuration_via_Ethernet_layer_2_LLDP-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Non-standard_implementations" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Non-standard_implementations"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Non-standard implementations</span> </div> </a> <button aria-controls="toc-Non-standard_implementations-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Non-standard implementations subsection</span> </button> <ul id="toc-Non-standard_implementations-sublist" class="vector-toc-list"> <li id="toc-Cisco" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cisco"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.1</span> <span>Cisco</span> </div> </a> <ul id="toc-Cisco-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Analog_Devices" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Analog_Devices"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.2</span> <span>Analog Devices</span> </div> </a> <ul id="toc-Analog_Devices-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Microsemi" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Microsemi"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.3</span> <span>Microsemi</span> </div> </a> <ul id="toc-Microsemi-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Passive" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Passive"> <div class="vector-toc-text"> <span class="vector-toc-numb">7.4</span> <span>Passive</span> </div> </a> <ul id="toc-Passive-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Power_capacity_limits" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Power_capacity_limits"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>Power capacity limits</span> </div> </a> <ul id="toc-Power_capacity_limits-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Pinouts" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Pinouts"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>Pinouts</span> </div> </a> <ul id="toc-Pinouts-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">10</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">11</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label 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Available in 25 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-25" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">25 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%B7%D8%A7%D9%82%D8%A9_%D8%B9%D8%A8%D8%B1_%D8%A7%D9%84%D8%A5%D9%8A%D8%AB%D8%B1%D9%86%D8%AA" title="طاقة عبر الإيثرنت – Arabic" lang="ar" hreflang="ar" data-title="طاقة عبر الإيثرنت" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Catalan" lang="ca" hreflang="ca" data-title="Power over Ethernet" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Czech" lang="cs" hreflang="cs" data-title="Power over Ethernet" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Danish" lang="da" hreflang="da" data-title="Power over Ethernet" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – German" lang="de" hreflang="de" data-title="Power over Ethernet" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Spanish" lang="es" hreflang="es" data-title="Power over Ethernet" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%A7%D9%86%D8%AA%D9%82%D8%A7%D9%84_%D8%AA%D9%88%D8%A7%D9%86_%D8%A7%D9%84%DA%A9%D8%AA%D8%B1%DB%8C%DA%A9%DB%8C_%D8%A8%D8%B1_%D8%A8%D8%B3%D8%AA%D8%B1_%DA%A9%D8%A7%D8%A8%D9%84_%D8%B4%D8%A8%DA%A9%D9%87" title="انتقال توان الکتریکی بر بستر کابل شبکه – Persian" lang="fa" hreflang="fa" data-title="انتقال توان الکتریکی بر بستر کابل شبکه" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Alimentation_%C3%A9lectrique_par_c%C3%A2ble_Ethernet" title="Alimentation électrique par câble Ethernet – French" lang="fr" hreflang="fr" data-title="Alimentation électrique par câble Ethernet" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%9D%B4%EB%8D%94%EB%84%B7_%EC%A0%84%EC%9B%90_%EC%9E%A5%EC%B9%98" title="이더넷 전원 장치 – Korean" lang="ko" hreflang="ko" data-title="이더넷 전원 장치" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Italian" lang="it" hreflang="it" data-title="Power over Ethernet" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Hebrew" lang="he" hreflang="he" data-title="Power over Ethernet" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Hungarian" lang="hu" hreflang="hu" data-title="Power over Ethernet" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Dutch" lang="nl" hreflang="nl" data-title="Power over Ethernet" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Japanese" lang="ja" hreflang="ja" data-title="Power over Ethernet" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Power over Ethernet" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Polish" lang="pl" hreflang="pl" data-title="Power over Ethernet" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Power_Over_Ethernet" title="Power Over Ethernet – Portuguese" lang="pt" hreflang="pt" data-title="Power Over Ethernet" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/PoE_(Alimentare_prin_Ethernet)" title="PoE (Alimentare prin Ethernet) – Romanian" lang="ro" hreflang="ro" data-title="PoE (Alimentare prin Ethernet)" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Russian" lang="ru" hreflang="ru" data-title="Power over Ethernet" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Simple English" lang="en-simple" hreflang="en-simple" data-title="Power over Ethernet" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Finnish" lang="fi" hreflang="fi" data-title="Power over Ethernet" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Swedish" lang="sv" hreflang="sv" data-title="Power over Ethernet" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Turkish" lang="tr" hreflang="tr" data-title="Power over Ethernet" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Power_over_Ethernet" title="Power over Ethernet – Ukrainian" lang="uk" hreflang="uk" data-title="Power over Ethernet" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E4%BB%A5%E5%A4%AA%E7%BD%91%E4%BE%9B%E7%94%B5" title="以太网供电 – Chinese" lang="zh" hreflang="zh" data-title="以太网供电" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet 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id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=802.3cq&redirect=no" class="mw-redirect" title="802.3cq">802.3cq</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">System for delivering power along with data over an Ethernet cable</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">"PoE" redirects here. For other uses, see <a href="/wiki/Poe_(disambiguation)" class="mw-disambig" title="Poe (disambiguation)">Poe (disambiguation)</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">"PoE++" and "4PPoE" redirect here. For the point-to-point protocol, see <a href="/wiki/PPPoE" class="mw-redirect" title="PPPoE">PPPoE</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="/wiki/Ethernet_over_power" class="mw-redirect" title="Ethernet over power">Ethernet over power</a> (<a href="/wiki/HomePlug" title="HomePlug">HomePlug</a>) particularly IEEE standard <a href="/wiki/IEEE_1901" title="IEEE 1901">IEEE 1901</a>.</div> <figure typeof="mw:File/Thumb"><a href="/wiki/File:ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg/300px-ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg" decoding="async" width="300" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg/450px-ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f1/ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg/600px-ZyXEL_ZyAIR_G-1000_and_D-Link_DWL-P50_20060829_2.jpg 2x" data-file-width="2560" data-file-height="1920" /></a><figcaption>In this configuration, an Ethernet connection includes Power over Ethernet (PoE) (gray cable looping below), and a PoE splitter provides a separate data cable (gray, looping above) and power cable (black, also looping above) for a <a href="/wiki/Wireless_access_point" title="Wireless access point">wireless access point</a>. The splitter is the silver and black box in the middle between the wiring junction box (left) and the access point (right). The PoE connection eliminates the need for a nearby <a href="/wiki/Power_outlet" class="mw-redirect" title="Power outlet">power outlet</a>. In another common configuration, the access point or other connected device includes internal PoE splitting and the external splitter is not necessary.</figcaption></figure> <p><b>Power over Ethernet</b> (<b>PoE</b>) describes any of several <a href="/wiki/Technical_standard" title="Technical standard">standards</a> or <a href="/wiki/Ad_hoc" title="Ad hoc">ad hoc</a> systems that pass <a href="/wiki/Electric_power" title="Electric power">electric power</a> along with data on <a href="/wiki/Twisted-pair_Ethernet" class="mw-redirect" title="Twisted-pair Ethernet">twisted-pair Ethernet</a> cabling. This allows a single cable to provide both a data connection and enough electricity to power networked devices such as <a href="/wiki/Wireless_access_point" title="Wireless access point">wireless access points</a> (WAPs), <a href="/wiki/IP_camera" title="IP camera">IP cameras</a> and <a href="/wiki/VoIP_phone" title="VoIP phone">VoIP phones</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Techniques">Techniques</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=1" title="Edit section: Techniques"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are several common techniques for transmitting power over Ethernet cabling. Three of them have been standardized by the <a href="/wiki/Institute_of_Electrical_and_Electronics_Engineers_(IEEE)" class="mw-redirect" title="Institute of Electrical and Electronics Engineers (IEEE)">Institute of Electrical and Electronics Engineers (IEEE)</a> standard <a href="/wiki/IEEE_802.3" title="IEEE 802.3">IEEE 802.3</a> since 2003. </p><p>The three techniques are: </p> <ul><li><i>alternative A</i>, which uses the same two of the four <a href="/wiki/Balanced_line" title="Balanced line">signal pairs</a> that <a href="/wiki/10BASE-T" class="mw-redirect" title="10BASE-T">10BASE-T</a> and <a href="/wiki/100BASE-TX" class="mw-redirect" title="100BASE-TX">100BASE-TX</a> use for data in typical <a href="/wiki/Cat_5" class="mw-redirect" title="Cat 5">Cat 5</a> cabling.</li> <li><i>alternative B</i>, which separates the data and the power conductors for 10BASE-T/100BASE-TX, making troubleshooting easier.</li> <li><i>4PPoE</i>, which uses all four twisted pairs in parallel, increasing the achievable power.</li></ul> <p>Alternative A transmits power on the same wires as data for 10 and 100 Mbit/s Ethernet variants. This is similar to the <a href="/wiki/Phantom_power" title="Phantom power">phantom power</a> technique commonly used for powering condenser microphones. Power is transmitted on the data conductors by applying a common voltage to each pair. Because twisted-pair Ethernet uses <a href="/wiki/Differential_signaling" class="mw-redirect" title="Differential signaling">differential signaling</a>, this does not interfere with <a href="/wiki/Data_transmission" class="mw-redirect" title="Data transmission">data transmission</a>. The common-mode voltage is easily extracted using the <a href="/wiki/Center_tap" title="Center tap">center tap</a> of the standard Ethernet <a href="/wiki/Pulse_transformer" class="mw-redirect" title="Pulse transformer">pulse transformer</a>. For <a href="/wiki/Gigabit_Ethernet" title="Gigabit Ethernet">Gigabit Ethernet</a> and faster, both alternatives A and B transmit power on wire pairs also used for data since all four pairs are used for data transmission at these speeds. </p><p><b>4PPoE</b> provides power using all four pairs of a twisted-pair cable. This enables higher power for applications like <a href="/wiki/Pan%E2%80%93tilt%E2%80%93zoom_camera" title="Pan–tilt–zoom camera">pan–tilt–zoom cameras</a> (PTZ), high-performance <a href="/wiki/Wireless_access_point" title="Wireless access point">wireless access points</a> (WAPs), or even charging <a href="/wiki/Laptop_battery" class="mw-redirect" title="Laptop battery">laptop batteries</a>. </p><p>In addition to standardizing existing practice for spare-pair (<i>Alternative B</i>), common-mode data pair power (<i>Alternative A</i>) and 4-pair transmission (<i>4PPoE</i>), the IEEE PoE standards provide for signaling between the <b>power sourcing equipment</b> (PSE) and <b>powered device</b> (PD). This signaling allows the presence of a conformant device to be detected by the power source, and allows the device and source to negotiate the amount of power required or available while avoiding damage to non-compatible devices. </p> <div class="mw-heading mw-heading2"><h2 id="Standards_development">Standards development</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=2" title="Edit section: Standards development"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Two-_and_four-pair_Ethernet">Two- and four-pair Ethernet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=3" title="Edit section: Two- and four-pair Ethernet"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The original <b>IEEE 802.3af-2003</b><sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> PoE standard provides up to 15.4 W of <a href="/wiki/Direct_Current" class="mw-redirect" title="Direct Current">DC</a> power (minimum <span class="nowrap">44 V DC</span> and 350 mA)<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> on each port.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p><p>The <b>IEEE 802.3at-2009</b><sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> PoE standard, also known as <b>PoE+</b> or <b>PoE plus</b>, provides up to 25.5 W of power for Type 2 devices.<sup id="cite_ref-standards.ieee.org_7-0" class="reference"><a href="#cite_note-standards.ieee.org-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> The 2009 standard prohibits a powered device from using all four pairs for power.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> Both of these standards have since been incorporated into the <a href="/wiki/IEEE_802.3-2012" class="mw-redirect" title="IEEE 802.3-2012">IEEE 802.3-2012</a> publication.<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> </p><p>The <b>IEEE 802.3bt-2018</b> standard further expands the power capabilities of 802.3at. It is also known as <b>PoE++</b> or <b>4PPoE</b>. The standard introduces two additional power types: up to 51 W delivered power (Type 3) and up to 71.3 W delivered power (Type 4), optionally by using all four pairs for power.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Each pair of twisted pairs needs to handle a current of up to 600 <a href="/wiki/Ampere" title="Ampere">mA</a> (Type 3) or 960 mA (Type 4).<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Additionally, support for <a href="/wiki/2.5GBASE-T_and_5GBASE-T" title="2.5GBASE-T and 5GBASE-T">2.5GBASE-T, 5GBASE-T</a> and <a href="/wiki/10GBASE-T" class="mw-redirect" title="10GBASE-T">10GBASE-T</a> is included.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> This development opens the door to new applications and expands the use of applications such as high-performance <a href="/wiki/Wireless_access_point" title="Wireless access point">wireless access points</a> and surveillance cameras. </p> <div class="mw-heading mw-heading3"><h3 id="Single-pair_Ethernet">Single-pair Ethernet</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=4" title="Edit section: Single-pair Ethernet"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <b>IEEE 802.3bu-2016</b><sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> amendment introduced <i>single-pair</i> <b>Power over Data Lines (<style data-mw-deduplicate="TemplateStyles:r1238216509">.mw-parser-output .vanchor>:target~.vanchor-text{background-color:#b1d2ff}@media screen{html.skin-theme-clientpref-night .mw-parser-output .vanchor>:target~.vanchor-text{background-color:#0f4dc9}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .vanchor>:target~.vanchor-text{background-color:#0f4dc9}}</style><span class="vanchor"><span id="PoDL"></span><span class="vanchor-text">PoDL</span></span>)</b> for the single-pair Ethernet standards <a href="/wiki/100BASE-T1" class="mw-redirect" title="100BASE-T1">100BASE-T1</a> and <a href="/wiki/1000BASE-T1" class="mw-redirect" title="1000BASE-T1">1000BASE-T1</a> intended for automotive and industrial applications.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> On the two-pair or four-pair standards, the same power voltage is applied to each conductor of the pair, so that within each pair there is no differential voltage other than that representing the transmitted data. With single-pair Ethernet, power is transmitted in parallel to the data. PoDL initially defined ten power classes, ranging from 0.5 to 50 W (at PD). </p><p>Subsequently, PoDL was added to the single-pair variants <a href="/wiki/Classic_Ethernet#10BASE-T1" title="Classic Ethernet">10BASE-T1</a>,<sup id="cite_ref-802.3cg_15-0" class="reference"><a href="#cite_note-802.3cg-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> <a href="/wiki/2.5GBASE-T_and_5GBASE-T" title="2.5GBASE-T and 5GBASE-T">2.5GBASE-T1, 5GBASE-T1</a>, and <a href="/wiki/10_Gigabit_Ethernet#10GBASE-T1" title="10 Gigabit Ethernet">10GBASE-T1</a><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> and as of 2021<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Power_over_Ethernet&action=edit">[update]</a></sup> includes a total of 15 power classes with additional intermediate voltage and power levels.<sup id="cite_ref-802.3cg_15-1" class="reference"><a href="#cite_note-802.3cg-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Uses">Uses</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=5" title="Edit section: Uses"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1248256098">@media all and (max-width:720px){.mw-parser-output .mod-gallery{width:100%!important}}.mw-parser-output .mod-gallery{display:table}.mw-parser-output .mod-gallery-default{background:transparent;margin-top:4px}.mw-parser-output .mod-gallery-center{margin-left:auto;margin-right:auto}.mw-parser-output .mod-gallery-left{float:left}.mw-parser-output .mod-gallery-right{float:right}.mw-parser-output .mod-gallery-none{float:none}.mw-parser-output .mod-gallery-collapsible{width:100%}.mw-parser-output .mod-gallery .title,.mw-parser-output .mod-gallery .main,.mw-parser-output .mod-gallery .footer{display:table-row}.mw-parser-output .mod-gallery .title>div{display:table-cell;padding:0 4px 4px;text-align:center;font-weight:bold}.mw-parser-output .mod-gallery .main>div{display:table-cell}.mw-parser-output .mod-gallery .gallery{line-height:1.35em}.mw-parser-output .mod-gallery .footer>div{display:table-cell;padding:4px;text-align:right;font-size:85%;line-height:1em}.mw-parser-output .mod-gallery .title>div *,.mw-parser-output .mod-gallery .footer>div *{overflow:visible}.mw-parser-output .mod-gallery .gallerybox img{background:none!important}.mw-parser-output .mod-gallery .bordered-images .thumb img{border:solid var(--background-color-neutral,#eaecf0)1px}.mw-parser-output .mod-gallery .whitebg .thumb{background:var(--background-color-base,#fff)!important}</style><div class="mod-gallery mod-gallery-default"><div class="title"><div>Products using PoE</div></div><div class="main"><div><ul class="gallery mw-gallery-traditional nochecker bordered-images whitebg"> <li class="gallerybox" style="width: 285px"> <div class="thumb" style="width: 280px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:IP_camera_Ethernet_power.jpg" class="mw-file-description" title="An IP camera powered by Power over Ethernet"><img alt="An IP camera powered by Power over Ethernet" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/IP_camera_Ethernet_power.jpg/200px-IP_camera_Ethernet_power.jpg" decoding="async" width="200" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ef/IP_camera_Ethernet_power.jpg/300px-IP_camera_Ethernet_power.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ef/IP_camera_Ethernet_power.jpg/400px-IP_camera_Ethernet_power.jpg 2x" data-file-width="1248" data-file-height="1124" /></a></span></div> <div class="gallerytext">An <a href="/wiki/IP_camera" title="IP camera">IP camera</a> powered by Power over Ethernet</div> </li> <li class="gallerybox" style="width: 285px"> <div class="thumb" style="width: 280px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:1140E.jpg" class="mw-file-description" title="Avaya IP Phone 1140E with PoE support"><img alt="Avaya IP Phone 1140E with PoE support" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/1140E.jpg/155px-1140E.jpg" decoding="async" width="155" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/1140E.jpg/233px-1140E.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bd/1140E.jpg/310px-1140E.jpg 2x" data-file-width="2048" data-file-height="2375" /></a></span></div> <div class="gallerytext"><a href="/wiki/Avaya_IP_Phone_1140E" title="Avaya IP Phone 1140E">Avaya IP Phone 1140E</a> with PoE support</div> </li> <li class="gallerybox" style="width: 285px"> <div class="thumb" style="width: 280px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:CableFree-FOR3-Microwave-Link-20180410.jpg" class="mw-file-description" title="A CableFree FOR3 microwave link installed in the UAE: a full outdoor radio featuring proprietary high power over Ethernet"><img alt="A CableFree FOR3 microwave link installed in the UAE: a full outdoor radio featuring proprietary high power over Ethernet" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/CableFree-FOR3-Microwave-Link-20180410.jpg/135px-CableFree-FOR3-Microwave-Link-20180410.jpg" decoding="async" width="135" height="180" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0a/CableFree-FOR3-Microwave-Link-20180410.jpg/202px-CableFree-FOR3-Microwave-Link-20180410.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0a/CableFree-FOR3-Microwave-Link-20180410.jpg/270px-CableFree-FOR3-Microwave-Link-20180410.jpg 2x" data-file-width="624" data-file-height="832" /></a></span></div> <div class="gallerytext">A CableFree FOR3 microwave link installed in the UAE: a full outdoor radio featuring proprietary high power over Ethernet</div> </li> <li class="gallerybox" style="width: 285px"> <div class="thumb" style="width: 280px; height: 210px;"><span typeof="mw:File"><a href="/wiki/File:IP-phone_with_PoE.jpg" class="mw-file-description" title="Cisco 7906 VoIP phone with PoE"><img alt="Cisco 7906 VoIP phone with PoE" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/IP-phone_with_PoE.jpg/250px-IP-phone_with_PoE.jpg" decoding="async" width="250" height="141" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/IP-phone_with_PoE.jpg/375px-IP-phone_with_PoE.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a7/IP-phone_with_PoE.jpg/500px-IP-phone_with_PoE.jpg 2x" data-file-width="4128" data-file-height="2322" /></a></span></div> <div class="gallerytext">Cisco 7906 <a href="/wiki/VoIP_phone" title="VoIP phone">VoIP phone</a> with PoE</div> </li> </ul></div></div></div> <p>Examples of devices powered by PoE include:<sup id="cite_ref-PoE_enabled_devices_17-0" class="reference"><a href="#cite_note-PoE_enabled_devices-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <ul><li><a href="/wiki/VoIP" class="mw-redirect" title="VoIP">VoIP</a> phones</li> <li><a href="/wiki/IP_camera" title="IP camera">IP cameras</a> including <a href="/wiki/Pan%E2%80%93tilt%E2%80%93zoom_camera" title="Pan–tilt–zoom camera">PTZs</a></li> <li><a href="/wiki/Wireless_access_point" title="Wireless access point">WAPs</a></li> <li><a href="/wiki/IPTV" class="mw-redirect" title="IPTV">IPTV decoders</a></li> <li>Network <a href="/wiki/Router_(computing)" title="Router (computing)">routers</a></li> <li>A mini <a href="/wiki/Network_switch" title="Network switch">network switch</a> installed in distant rooms, to support a small cluster of Ethernet ports from one <a href="/wiki/Uplink" class="mw-redirect" title="Uplink">uplink</a> cable. PoE power is fed into the PD (or PoE in) port. These switches may in turn power remote PoE devices using PoE pass through.</li> <li><a href="/wiki/Intercom" title="Intercom">Intercom</a> and <a href="/wiki/Public_address_system" title="Public address system">public address systems</a> and hallway speaker amplifiers</li> <li><a href="/wiki/Clock" title="Clock">Wall clocks</a> in rooms and hallways, with time set using <a href="/wiki/Network_Time_Protocol" title="Network Time Protocol">Network Time Protocol (NTP)</a></li> <li>Outdoor roof mounted radios with integrated antennas, 4G/LTE, 802.11 or 802.16 based wireless CPEs (customer premises equipment) used by wireless ISPs</li> <li>Outdoor <a href="/wiki/Point-to-point_(telecommunications)" title="Point-to-point (telecommunications)">point to point</a> microwave and millimeter wave radios and some <a href="/wiki/Free_space_optics" class="mw-redirect" title="Free space optics">Free Space Optics (FSO)</a> units usually featuring proprietary PoE</li> <li><a href="/wiki/Industrial_control_system" title="Industrial control system">Industrial control system</a> components including sensors, controllers, meters etc.</li> <li><a href="/wiki/Access_control" title="Access control">Access control</a> components including help-points, intercoms, entry cards, keyless entry, etc.</li> <li><a href="/wiki/Lighting_control_system" title="Lighting control system">Intelligent lighting controllers</a> and <a href="/wiki/Light-emitting_diode" title="Light-emitting diode">Light-Emitting Diode (LED)</a> <a href="/wiki/LED_lamp" title="LED lamp">Lighting fixtures</a><sup id="cite_ref-POE_LED_Lighting_18-0" class="reference"><a href="#cite_note-POE_LED_Lighting-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup></li> <li>Stage and Theatrical devices, such as networked audio breakout and routing boxes</li> <li>Remote <a href="/wiki/Point_of_sale" title="Point of sale">Point Of Sale (POS)</a> kiosks</li> <li>Inline Ethernet extenders<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li> <li>PoE splitters that output the power, often at a different voltage (e.g. 5V), to power a remote device or charge a <a href="/wiki/Mobile_phone" title="Mobile phone">mobile phone</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Terminology">Terminology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=6" title="Edit section: Terminology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Power_sourcing_equipment">Power sourcing equipment</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=7" title="Edit section: Power sourcing equipment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><i>Power sourcing equipment</i> (PSE) are devices that provide (<i><a href="/wiki/Power_source_(disambiguation)" class="mw-redirect mw-disambig" title="Power source (disambiguation)">source</a></i>) power on the Ethernet cable. This device may be a <a href="/wiki/Network_switch" title="Network switch">network switch</a>, commonly called an <i>endspan</i> (IEEE 802.3af refers to it as <i>endpoint</i>), or an intermediary device between a non-PoE-capable switch and a PoE device, an external PoE <i>injector</i>, called a <i>midspan</i> device.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Powered_device">Powered device</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=8" title="Edit section: Powered device"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A <i>powered device</i> (PD) is any device powered by PoE, thus consuming energy. Examples include <a href="/wiki/Wireless_access_point" title="Wireless access point">wireless access points</a>, <a href="/wiki/VoIP_phone" title="VoIP phone">VoIP phones</a>, and <a href="/wiki/IP_camera" title="IP camera">IP cameras</a>. </p><p>Many powered devices have an auxiliary power connector for an optional external power supply. Depending on the design, some, none, or all of the device's power can be supplied from the auxiliary port,<sup id="cite_ref-802.3-2008,_33.3.5_PD_Power_21-0" class="reference"><a href="#cite_note-802.3-2008,_33.3.5_PD_Power-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-802.3at-2009,_33.3.7_PD_Power_22-0" class="reference"><a href="#cite_note-802.3at-2009,_33.3.7_PD_Power-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> with the auxiliary port also sometimes acting as backup power in case PoE-supplied power fails. </p> <div class="mw-heading mw-heading2"><h2 id="Power_management_features_and_integration">Power management features and integration</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=9" title="Edit section: Power management features and integration"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:5520-24-POE.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/5520-24-POE.JPG/300px-5520-24-POE.JPG" decoding="async" width="300" height="58" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/5520-24-POE.JPG/450px-5520-24-POE.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/aa/5520-24-POE.JPG/600px-5520-24-POE.JPG 2x" data-file-width="663" data-file-height="128" /></a><figcaption><a href="/wiki/Avaya_ERS_5500" class="mw-redirect" title="Avaya ERS 5500">Avaya ERS 5500</a> switch with 48 Power over Ethernet ports</figcaption></figure> <p>Advocates of PoE expect PoE to become a global long term DC power cabling standard and replace a multiplicity of individual <a href="/wiki/AC_adapter" title="AC adapter">AC adapters</a>, which cannot be easily centrally managed.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> Critics of this approach argue that PoE is inherently less efficient than AC power due to the lower voltage, and this is made worse by the thin conductors of Ethernet. Advocates of PoE, like the <a href="/wiki/Ethernet_Alliance" title="Ethernet Alliance">Ethernet Alliance</a>, point out that quoted losses are for worst case scenarios in terms of cable quality, length and power consumption by powered devices.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> In any case, where the central PoE supply replaces several dedicated AC circuits, transformers and inverters, the power loss in cabling can be justifiable. </p> <div class="mw-heading mw-heading3"><h3 id="Integrating_EEE_and_PoE">Integrating EEE and PoE</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=10" title="Edit section: Integrating EEE and PoE"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The integration of PoE with the IEEE 802.3az <a href="/wiki/Energy-Efficient_Ethernet" title="Energy-Efficient Ethernet">Energy-Efficient Ethernet</a> (EEE) standard potentially produces additional energy savings. Pre-standard integrations of EEE and PoE (such as <a href="/wiki/Marvell_Technology_Group" class="mw-redirect" title="Marvell Technology Group">Marvell</a>'s <b>EEPoE</b> outlined in a May 2011 white paper) claim to achieve a savings upwards of 3 W per link. This saving is especially significant as higher power devices come online.<sup id="cite_ref-marvell1_25-0" class="reference"><a href="#cite_note-marvell1-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Standard_implementation">Standard implementation</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=11" title="Edit section: Standard implementation"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Standards-based Power over Ethernet is implemented following the specifications in IEEE 802.3af-2003 (which was later incorporated as clause 33 into <a href="/wiki/IEEE_802.3-2005" class="mw-redirect" title="IEEE 802.3-2005">IEEE 802.3-2005</a>) or the 2009 update, IEEE 802.3at. The standards require <a href="/wiki/Category_5_cable" title="Category 5 cable">category 5 cable</a> or better for high power levels but allow using <a href="/wiki/Category_3_cable" title="Category 3 cable">category 3 cable</a> if less power is required.<sup id="cite_ref-33.1.1c_26-0" class="reference"><a href="#cite_note-33.1.1c-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </p><p>Power is supplied as a <a href="/wiki/Common-mode_signal" title="Common-mode signal">common-mode signal</a> over two or more of the <a href="/wiki/Twisted_pair" title="Twisted pair">differential pairs</a> of wires found in the <a href="/wiki/Ethernet" title="Ethernet">Ethernet</a> cables and comes from a power supply within a PoE-enabled networking device such as an <a href="/wiki/Ethernet_switch" class="mw-redirect" title="Ethernet switch">Ethernet switch</a> or can be injected into a cable run with a <i>midspan</i> power supply, an additional PoE power source that can be used in combination with a non-PoE switch. </p><p>A <a href="/wiki/Phantom_power" title="Phantom power">phantom power</a> technique is used to allow the powered pairs to also carry data. This permits its use not only with <a href="/wiki/10BASE-T" class="mw-redirect" title="10BASE-T">10BASE-T</a> and <a href="/wiki/100BASE-TX" class="mw-redirect" title="100BASE-TX">100BASE-TX</a>, which use only two of the four pairs in the cable, but also with <a href="/wiki/1000BASE-T" class="mw-redirect" title="1000BASE-T">1000BASE-T</a> (gigabit Ethernet), <a href="/wiki/2.5GBASE-T_and_5GBASE-T" title="2.5GBASE-T and 5GBASE-T">2.5GBASE-T, 5GBASE-T</a>, and <a href="/wiki/10GBASE-T" class="mw-redirect" title="10GBASE-T">10GBASE-T</a> which use all four pairs for data transmission. This is possible because all versions of Ethernet over twisted pair cable specify <a href="/wiki/Differential_signaling" class="mw-redirect" title="Differential signaling">differential data transmission</a> over each pair with <a href="/wiki/Network_isolator" title="Network isolator">transformer coupling</a>; the DC supply and load connections can be made to the transformer center-taps at each end. Each pair thus operates in <a href="/wiki/Common-mode_signal" title="Common-mode signal">common mode</a> as one side of the DC supply, so two pairs are required to complete the circuit. The polarity of the DC supply may be inverted by <a href="/wiki/Ethernet_crossover_cable" title="Ethernet crossover cable">crossover cables</a>; the powered device must operate with either pair: spare pairs 4–5 and 7–8 or data pairs 1–2 and 3–6. Polarity is defined by the standards on spare pairs, and ambiguously implemented for data pairs, with the use of a <a href="/wiki/Diode_bridge" title="Diode bridge">diode bridge</a>. </p> <table class="wikitable"> <caption>Comparison of PoE parameters </caption> <tbody><tr> <th>Property </th> <th>802.3af <span class="nowrap">(802.3at Type 1)</span>, <i>PoE</i> </th> <th><span class="nowrap">802.3at Type 2</span>, <i>PoE+</i> </th> <th><span class="nowrap">802.3bt Type 3</span>, <i>4PPoE</i><sup id="cite_ref-802.3bt_0514_27-0" class="reference"><a href="#cite_note-802.3bt_0514-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> or <i>PoE++</i> </th> <th><span class="nowrap">802.3bt Type 4</span>, <i>4PPoE</i> or <i>PoE++</i> </th></tr> <tr> <td>Power available at PD<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup> </td> <td><span class="nowrap">12.95 W</span> </td> <td><span class="nowrap">25.50 W</span> </td> <td><span class="nowrap">51 W</span> </td> <td><span class="nowrap">71.3 W</span> </td></tr> <tr> <td>Maximum power delivered by PSE </td> <td><span class="nowrap">15.40 W</span> </td> <td><span class="nowrap">30.0 W</span> </td> <td><span class="nowrap">60 W</span> </td> <td><span class="nowrap">90 W</span><sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>Voltage range (at PSE) </td> <td><span class="nowrap">44.0–57.0 V</span><sup id="cite_ref-Table_33.11_30-0" class="reference"><a href="#cite_note-Table_33.11-30"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </td> <td colspan="2"><span class="nowrap">50.0–57.0 V</span><sup id="cite_ref-Table_33.11_30-1" class="reference"><a href="#cite_note-Table_33.11-30"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </td> <td><span class="nowrap">52.0–57.0 V</span> </td></tr> <tr> <td>Voltage range (at PD) </td> <td><span class="nowrap">37.0–57.0 V</span><sup id="cite_ref-Table_33.18_31-0" class="reference"><a href="#cite_note-Table_33.18-31"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </td> <td colspan="2"><span class="nowrap">42.5–57.0 V</span><sup id="cite_ref-Table_33.18_31-1" class="reference"><a href="#cite_note-Table_33.18-31"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Table_145-1_32-0" class="reference"><a href="#cite_note-Table_145-1-32"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </td> <td><span class="nowrap">41.1–57.0 V</span> </td></tr> <tr> <td>Maximum current I<sub>max</sub> </td> <td><span class="nowrap">350 mA</span><sup id="cite_ref-table_33-1_33-0" class="reference"><a href="#cite_note-table_33-1-33"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </td> <td colspan="2"><span class="nowrap">600 mA</span> per pair<sup id="cite_ref-table_33-1_33-1" class="reference"><a href="#cite_note-table_33-1-33"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Table_145-1_32-1" class="reference"><a href="#cite_note-Table_145-1-32"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </td> <td><span class="nowrap">960 mA</span> per pair<sup id="cite_ref-Table_145-1_32-2" class="reference"><a href="#cite_note-Table_145-1-32"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>Maximum cable resistance per pairset </td> <td><span class="nowrap">20 Ω</span><sup id="cite_ref-33.1.4_34-0" class="reference"><a href="#cite_note-33.1.4-34"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup> (<a href="/wiki/Category_3_cable" title="Category 3 cable">Category 3</a>) </td> <td colspan="3"><span class="nowrap">12.5 Ω</span><sup id="cite_ref-33.1.4_34-1" class="reference"><a href="#cite_note-33.1.4-34"><span class="cite-bracket">[</span>33<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Table_145-1_32-3" class="reference"><a href="#cite_note-Table_145-1-32"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> (<a href="/wiki/Category_5_cable" title="Category 5 cable">Category 5</a>) </td></tr> <tr> <td>Power management </td> <td>Three power class levels (1–3) negotiated by signature </td> <td>Four power class levels (1–4) negotiated by signature or <span class="nowrap">0.1 W</span> steps negotiated by LLDP </td> <td>Six power class levels (1–6) negotiated by signature or <span class="nowrap">0.1 W</span> steps negotiated by LLDP<sup id="cite_ref-35" class="reference"><a href="#cite_note-35"><span class="cite-bracket">[</span>34<span class="cite-bracket">]</span></a></sup> </td> <td>Eight power class levels (1–8) negotiated by signature or <span class="nowrap">0.1 W</span> steps negotiated by LLDP </td></tr> <tr> <td>Derating of maximum cable ambient operating temperature </td> <td>None </td> <td>5 °C (9 °F) with one mode (two pairs) active </td> <td>10 °C (20 °F) with more than half of bundled cables pairs at I<sub>max</sub><sup id="cite_ref-bt_temp_36-0" class="reference"><a href="#cite_note-bt_temp-36"><span class="cite-bracket">[</span>35<span class="cite-bracket">]</span></a></sup> </td> <td>10 °C (20 °F) with temperature planning required </td></tr> <tr> <td>Supported cabling </td> <td>Category 3 and Category 5<sup id="cite_ref-33.1.1c_26-1" class="reference"><a href="#cite_note-33.1.1c-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> </td> <td colspan="3">Category 5<sup id="cite_ref-33.1.1c_26-2" class="reference"><a href="#cite_note-33.1.1c-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-37" class="reference"><a href="#cite_note-37"><span class="cite-bracket">[</span>note 2<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <td>Supported modes </td> <td>Mode A (endspan), Mode B (midspan) </td> <td>Mode A, Mode B </td> <td>Mode A, Mode B, 4-pair Mode </td> <td>4-pair Mode Mandatory </td></tr></tbody></table> <p>Notes: </p> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text">Most <a href="/wiki/Switched-mode_power_supplies" class="mw-redirect" title="Switched-mode power supplies">switched-mode power supplies</a> within the powered device will lose another 10 to 25% of the available power to heat.</span> </li> <li id="cite_note-37"><span class="mw-cite-backlink"><b><a href="#cite_ref-37">^</a></b></span> <span class="reference-text">More stringent cable specification allows assumption of more current carrying capacity and lower resistance (20.0 Ω for Category 3 versus 12.5 Ω for Category 5).</span> </li> </ol></div> <div class="mw-heading mw-heading3"><h3 id="Powering_devices">Powering devices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=12" title="Edit section: Powering devices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Three modes, A, B, and 4-pair are available. Mode A delivers power on the data pairs of <a href="/wiki/100BASE-TX" class="mw-redirect" title="100BASE-TX">100BASE-TX</a> or 10BASE-T. Mode B delivers power on the spare pairs. 4-pair delivers power on all four pairs. PoE can also be used on 1000BASE-T, 2.5GBASE-T, 5GBASE-T and 10GBASE-T Ethernet, in which case there are no spare pairs and all power is delivered using the phantom technique. </p><p>Mode A has two alternate configurations (MDI and MDI-X), using the same pairs but with different polarities. In mode A, pins 1 and 2 (pair #2 in <a href="/wiki/T568B" class="mw-redirect" title="T568B">T568B</a> wiring) form one side of the 48 V DC, and pins 3 and 6 (pair #3 in T568B) form the other side. These are the same two pairs used for data transmission in 10BASE-T and 100BASE-TX, allowing the provision of both power and data over only two pairs in such networks. The free polarity allows PoE to accommodate for crossover cables, patch cables and <a href="/wiki/Auto_MDI-X" class="mw-redirect" title="Auto MDI-X">Auto MDI-X</a>. </p><p>In mode B, pins 4–5 (pair #1 in both <a href="/wiki/T568A" class="mw-redirect" title="T568A">T568A</a> and T568B) form one side of the DC supply and pins 7–8 (pair #4 in both T568A and T568B) provide the return; these are the <i>spare</i> pairs in 10BASE-T and 100BASE-TX. Mode B, therefore, requires a 4-pair cable. </p><p>The PSE, not the PD, decides whether power mode A or B shall be used. PDs that implement only mode A or mode B are disallowed by the standard.<sup id="cite_ref-38" class="reference"><a href="#cite_note-38"><span class="cite-bracket">[</span>36<span class="cite-bracket">]</span></a></sup> The PSE can implement mode A or B or both. A PD indicates that it is standards-compliant by placing a 25 kΩ resistor between the powered pairs. If the PSE detects a resistance that is too high or too low (including a short circuit), no power is applied. This protects devices that do not support PoE. An optional <i>power class</i> feature allows the PD to indicate its power requirements by changing the sense resistance at higher voltages. </p><p>To retain power, the PD must use at least 5–10 mA for at least 60 ms at a time. If the PD goes more than 400 ms without meeting this requirement, the PSE will consider the device disconnected and, for safety reasons, remove power.<sup id="cite_ref-39" class="reference"><a href="#cite_note-39"><span class="cite-bracket">[</span>37<span class="cite-bracket">]</span></a></sup> </p><p>There are two types of PSEs: endspans and midspans. Endspans (commonly called PoE switches) are Ethernet switches that include the power over Ethernet transmission circuitry. Midspans are power injectors that stand between a regular Ethernet switch and the powered device, injecting power without affecting the data. Endspans are normally used on new installations or when the switch has to be replaced for other reasons (such as moving from <a href="/wiki/10/100" class="mw-redirect" title="10/100">10/100</a> Mbit/s to 1 Gbit/s), which makes it convenient to add the PoE capability. Midspans are used when there is no desire to replace and configure a new Ethernet switch, and only PoE needs to be added to the network. </p> <table class="wikitable"> <caption>Stages of powering up a PoE link </caption> <tbody><tr> <th rowspan="2">Stage </th> <th rowspan="2">Action </th> <th colspan="2">Volts specified (V) </th></tr> <tr> <th>802.3af </th> <th>802.3at </th></tr> <tr> <td>Detection</td> <td>PSE detects if the PD has the correct signature resistance of <span class="nowrap">19–26.5 kΩ</span> </td> <td colspan="2" style="text-align:center;"><span class="nowrap">2.7–10.1</span> </td></tr> <tr> <td>Classification</td> <td>PSE detects resistor indicating power range (<a href="#Power_levels_available">see below</a>) </td> <td colspan="2" style="text-align:center;"><span class="nowrap">14.5–20.5</span> </td></tr> <tr> <td><span class="nowrap">Mark 1</span></td> <td>Signals PSE is 802.3at capable. PD presents a <span class="nowrap">0.25–4 mA</span> load. </td> <td align="center">—</td> <td align="center"><span class="nowrap">7–10</span> </td></tr> <tr> <td><span class="nowrap">Class 2</span></td> <td>PSE outputs classification voltage again to indicate 802.3at capability </td> <td align="center">—</td> <td align="center"><span class="nowrap">14.5–20.5</span> </td></tr> <tr> <td><span class="nowrap">Mark 2</span></td> <td>Signals PSE is 802.3at capable. PD presents a <span class="nowrap">0.25–4 mA</span> load. </td> <td align="center">—</td> <td align="center"><span class="nowrap">7–10</span> </td></tr> <tr> <td>Startup</td> <td>Startup voltage<sup id="cite_ref-802.3-2008,_section_2,_table_33-12_40-0" class="reference"><a href="#cite_note-802.3-2008,_section_2,_table_33-12-40"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-802.3at,_table_33-18_41-0" class="reference"><a href="#cite_note-802.3at,_table_33-18-41"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup></td> <td align="center"><span class="nowrap">> 42</span></td> <td align="center"><span class="nowrap">> 42</span> </td></tr> <tr> <td>Normal operation</td> <td>Supply power to device<sup id="cite_ref-802.3-2008,_section_2,_table_33-12_40-1" class="reference"><a href="#cite_note-802.3-2008,_section_2,_table_33-12-40"><span class="cite-bracket">[</span>38<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-802.3at,_table_33-18_41-1" class="reference"><a href="#cite_note-802.3at,_table_33-18-41"><span class="cite-bracket">[</span>39<span class="cite-bracket">]</span></a></sup></td> <td align="center"><span class="nowrap">37–57</span></td> <td align="center"><span class="nowrap">42.5–57</span> </td></tr></tbody></table> <p>IEEE 802.3at capable devices are also referred to as <i>Type 2</i>. An 802.3at PSE may also use <a href="#Configuration_via_Ethernet_layer_2_LLDP">LLDP communication</a> to signal 802.3at capability.<sup id="cite_ref-linear-LTC4278_ds_42-0" class="reference"><a href="#cite_note-linear-LTC4278_ds-42"><span class="cite-bracket">[</span>40<span class="cite-bracket">]</span></a></sup> <span class="anchor" id="Power_levels_available"></span> </p> <table class="wikitable"> <caption>Power levels available<sup id="cite_ref-802.3s2t33.3_43-0" class="reference"><a href="#cite_note-802.3s2t33.3-43"><span class="cite-bracket">[</span>41<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-44" class="reference"><a href="#cite_note-44"><span class="cite-bracket">[</span>42<span class="cite-bracket">]</span></a></sup> </caption> <tbody><tr> <th>Class</th> <th>Usage</th> <th>Classification current (mA)</th> <th>Power range at PD (W)</th> <th>Max power from PSE (W)</th> <th>Class description </th></tr> <tr> <td>0</td> <td>Default</td> <td>0–5</td> <td>0.44–12.94</td> <td>15.4</td> <td>Classification unimplemented </td></tr> <tr> <td>1</td> <td>Optional</td> <td>8–13</td> <td>0.44–3.84</td> <td>4.00</td> <td>Very Low power </td></tr> <tr> <td>2</td> <td>Optional</td> <td>16–21</td> <td>3.84–6.49</td> <td>7.00</td> <td>Low power </td></tr> <tr> <td>3</td> <td>Optional</td> <td>25–31</td> <td>6.49–12.95</td> <td>15.4</td> <td>Mid power </td></tr> <tr> <td>4</td> <td>Valid for Type 2 (802.3at) devices,<br />not allowed for 802.3af devices</td> <td>35–45</td> <td>12.95–25.50</td> <td>30</td> <td>High power </td></tr> <tr> <td>5</td> <td rowspan="2">Valid for Type 3 (802.3bt) devices</td> <td>36–44 & 1–4</td> <td>40 (4-pair)</td> <td>45</td> <td> </td></tr> <tr> <td>6</td> <td>36–44 & 9–12</td> <td>51 (4-pair)</td> <td>60</td> <td> </td></tr> <tr> <td>7</td> <td rowspan="2">Valid for Type 4 (802.3bt) devices</td> <td>36–44 & 17–20</td> <td>62 (4-pair)</td> <td>75</td> <td> </td></tr> <tr> <td>8</td> <td>36–44 & 26–30</td> <td>71.3 (4-pair)</td> <td>90</td> <td> </td></tr></tbody></table> <p>Class 4 can only be used by IEEE 802.3at (Type 2) devices, requiring valid Class 2 and Mark 2 currents for the power up stages. An 802.3af device presenting a class 4 current is considered non-compliant and, instead, will be treated as a Class 0 device.<sup id="cite_ref-802.3,_section_2,_33.3.4_45-0" class="reference"><a href="#cite_note-802.3,_section_2,_33.3.4-45"><span class="cite-bracket">[</span>43<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 13">: 13 </span></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Configuration_via_Ethernet_layer_2_LLDP">Configuration via Ethernet layer 2 LLDP</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=13" title="Edit section: Configuration via Ethernet layer 2 LLDP"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Link_Layer_Discovery_Protocol" title="Link Layer Discovery Protocol">Link Layer Discovery Protocol</a> (LLDP) is a layer-2 Ethernet protocol for managing devices. LLDP allows an exchange of information between a PSE and a PD. This information is formatted in <a href="/wiki/Type%E2%80%93length%E2%80%93value" title="Type–length–value">type–length–value</a> (TLV) format. PoE standards define TLV structures used by PSEs and PDs to signal and negotiate available power. </p> <table class="wikitable"> <caption><a href="/wiki/LLDP" class="mw-redirect" title="LLDP">LLDP</a> Power via MDI TLV <i>IEEE 802.3-2015</i><sup id="cite_ref-802.3_PoETLV_46-0" class="reference"><a href="#cite_note-802.3_PoETLV-46"><span class="cite-bracket">[</span>44<span class="cite-bracket">]</span></a></sup> </caption> <tbody><tr> <th colspan="2" style="width:60px;">TLV Header </th> <th colspan="8" style="width:60px;">TLV information string </th></tr> <tr style="text-align:center;"> <th style="width:60px;">Type  <br />(<span class="nowrap">7 bits</span>) </th> <th style="width:60px;">Length <br />(<span class="nowrap">9 bits</span>) </th> <th style="width:75px;">IEEE 802.3 <a href="/wiki/Organizationally_Unique_Identifier" class="mw-redirect" title="Organizationally Unique Identifier">OUI</a>  <br />(<span class="nowrap">3 octets</span>) </th> <th>IEEE 802.3 subtype<br />(<span class="nowrap">1 octet</span>) </th> <th>MDI power support<sup id="cite_ref-RFC3621_47-0" class="reference"><a href="#cite_note-RFC3621-47"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><br />(<span class="nowrap">1 octet</span>) </th> <th>PSE power pair<sup id="cite_ref-RFC3621_47-1" class="reference"><a href="#cite_note-RFC3621-47"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><br />(<span class="nowrap">1 octet</span>) </th> <th>Power class <br />(<span class="nowrap">1 octet</span>) </th> <th>Type/source priority <br />(<span class="nowrap">1 octet</span>) </th> <th>PD requested power value <br />(<span class="nowrap">2 octets</span>) </th> <th>PSE allocated power value <br />(<span class="nowrap">2 octets</span>) </th></tr> <tr> <td style="text-align:center;">127 </td> <td style="text-align:center;">12 </td> <td style="text-align:center;">00-12-0F </td> <td style="text-align:center;">2 </td> <td>b0 port class: 1=PSE; 0=PD<br />b1 PSE MDI power support<br />b2 PSE MDI power state<br />b3 PSE pairs control ability<br />b7-4 reserved </td> <td>1=signal pair<br />2=spare pair </td> <td>1=class 0<br />2=class 1<br />3=class 2<br />4=class 3<br />5=class 4 </td> <td>b7 power type: 1=Type 1; 0=Type 2<br />b6 power type: 1=PD; 0=PSE <br />b5-4: power source<br />b3-2: reserved<br />b0-1 power priority: 11=low;10=high;01=critical;00=unknown </td> <td><span class="nowrap">0–25.5 W</span> in <span class="nowrap">0.1 W</span> steps </td> <td><span class="nowrap">0–25.5 W</span> in <span class="nowrap">0.1 W</span> steps </td></tr></tbody></table> <table class="wikitable"> <caption>Legacy LLDP Power via MDI TLV <i>IEEE 802.1AB-2009</i><sup id="cite_ref-48" class="reference"><a href="#cite_note-48"><span class="cite-bracket">[</span>46<span class="cite-bracket">]</span></a></sup> </caption> <tbody><tr> <th colspan="2" style="width:60px;">TLV Header </th> <th colspan="5" style="width:60px;">TLV information string </th></tr> <tr style="text-align:center;"> <th style="width:60px;">Type  <br />(<span class="nowrap">7 bits</span>) </th> <th style="width:60px;">Length <br />(<span class="nowrap">9 bits</span>) </th> <th style="width:75px;">IEEE 802.3 <a href="/wiki/Organizationally_Unique_Identifier" class="mw-redirect" title="Organizationally Unique Identifier">OUI</a>  <br />(<span class="nowrap">3 octets</span>) </th> <th>IEEE 802.3 subtype<br />(<span class="nowrap">1 octet</span>) </th> <th>MDI power support<sup id="cite_ref-RFC3621_47-2" class="reference"><a href="#cite_note-RFC3621-47"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><br />(<span class="nowrap">1 octet</span>) </th> <th>PSE power pair<sup id="cite_ref-RFC3621_47-3" class="reference"><a href="#cite_note-RFC3621-47"><span class="cite-bracket">[</span>45<span class="cite-bracket">]</span></a></sup><br />(<span class="nowrap">1 octet</span>) </th> <th>Power class <br />(<span class="nowrap">1 octet</span>) </th></tr> <tr> <td style="text-align:center;">127 </td> <td style="text-align:center;">7 </td> <td style="text-align:center;">00-12-0F </td> <td style="text-align:center;">2 </td> <td>b0 port class: 1=PSE; 0=PD<br />b1 PSE MDI power support<br />b2 PSE MDI power state<br />b3 PSE pairs control ability<br />b7-4 reserved </td> <td>1=signal pair<br />2=spare pair </td> <td>1=class 0<br />2=class 1<br />3=class 2<br />4=class 3<br />5=class 4 </td></tr></tbody></table> <table class="wikitable"> <caption>Legacy LLDP- <a href="/wiki/Link_Layer_Discovery_Protocol#Media_endpoint_discovery_extension" title="Link Layer Discovery Protocol">MED</a> Advanced Power Management<sup id="cite_ref-ieee802-lldp-med-prop2006_49-0" class="reference"><a href="#cite_note-ieee802-lldp-med-prop2006-49"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 8">: 8 </span></sup> </caption> <tbody><tr> <th colspan="2" style="width:60px;">TLV Header </th> <th colspan="2" style="width:60px;"><a href="/wiki/Link_Layer_Discovery_Protocol#Media_endpoint_discovery_extension" title="Link Layer Discovery Protocol">MED</a> Header </th> <th colspan="4" style="width:60px;">Extended power via <a href="/wiki/Medium_dependent_interface" class="mw-redirect" title="Medium dependent interface">MDI</a> </th></tr> <tr style="text-align:center;"> <th style="width:60px;">Type  <br />(<span class="nowrap">7 bits</span>) </th> <th style="width:60px;">Length <br />(<span class="nowrap">9 bits</span>) </th> <th style="width:75px;"><a href="/wiki/Telecommunications_Industry_Association" title="Telecommunications Industry Association">TIA</a> <a href="/wiki/Organizationally_Unique_Identifier" class="mw-redirect" title="Organizationally Unique Identifier">OUI</a>  <br />(<span class="nowrap">3 octets</span>) </th> <th>Extended power via MDI subtype <br />(<span class="nowrap">1 octet</span>) </th> <th>Power type <br />(<span class="nowrap">2 bits</span>) </th> <th>Power source <br />(<span class="nowrap">2 bits</span>) </th> <th>Power priority <br />(<span class="nowrap">4 bits</span>) </th> <th>Power value <br />(<span class="nowrap">2 octets</span>) </th></tr> <tr style="text-align:center;"> <td>127 </td> <td>7 </td> <td>00-12-BB </td> <td>4 </td> <td><a href="#Power_sourcing_equipment">PSE</a> or <a href="#Powered_device">PD</a> </td> <td>Normal or <a href="/wiki/Emergency_power_system" title="Emergency power system">Backup conservation</a> </td> <td>Critical,<br /> High,<br /> Low </td> <td><span class="nowrap">0–102.3 W</span> in <span class="nowrap">0.1 W</span> steps </td></tr></tbody></table> <p>The setup phases are as follows: </p> <ul><li>PSE (provider) tests PD (consumer) physically using 802.3af phase class 3. <ul><li>PSE powers up PD.</li></ul></li> <li>PD sends to PSE: I'm a PD, max power = X, max power requested = X.</li> <li>PSE sends to PD: I'm a PSE, max power allowed = X. <ul><li>PD may now use the amount of power as specified by the PSE.</li></ul></li></ul> <p>The rules for this power negotiation are: </p> <ul><li>PD shall never request more power than physical 802.3af class</li> <li>PD shall never draw more than max power advertised by PSE</li> <li>PSE may deny any PD drawing more power than max allowed by PSE</li> <li>PSE shall not reduce power allocated to PD that is in use</li> <li>PSE may <i>request</i> reduced power, via conservation mode<sup id="cite_ref-ieee802-lldp-med-prop2006_49-1" class="reference"><a href="#cite_note-ieee802-lldp-med-prop2006-49"><span class="cite-bracket">[</span>47<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 10">: 10 </span></sup></li></ul> <div class="mw-heading mw-heading2"><h2 id="Non-standard_implementations">Non-standard implementations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=14" title="Edit section: Non-standard implementations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>There are more than ten proprietary implementations.<sup id="cite_ref-50" class="reference"><a href="#cite_note-50"><span class="cite-bracket">[</span>48<span class="cite-bracket">]</span></a></sup> The more common ones are discussed below. </p> <div class="mw-heading mw-heading3"><h3 id="Cisco">Cisco</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=15" title="Edit section: Cisco"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Some Cisco WLAN access points and <a href="/wiki/VoIP_phone" title="VoIP phone">VoIP phones</a> supported a proprietary form of PoE<sup id="cite_ref-pinout_51-0" class="reference"><a href="#cite_note-pinout-51"><span class="cite-bracket">[</span>49<span class="cite-bracket">]</span></a></sup> many years before there was an IEEE standard for delivering PoE. Cisco's original PoE implementation is not software upgradeable to the IEEE 802.3af standard. Cisco's original PoE equipment is capable of delivering up to <span class="nowrap">10 W</span> per port. The amount of power to be delivered is negotiated between the endpoint and the Cisco switch based on a power value that was added to the Cisco proprietary <a href="/wiki/Cisco_Discovery_Protocol" title="Cisco Discovery Protocol">Cisco Discovery Protocol</a> (CDP). CDP is also responsible for dynamically communicating the Voice VLAN value from the Cisco switch to the Cisco VoIP Phone. </p><p>Under Cisco's pre-standard scheme, the PSE (switch) will send a <a href="/wiki/Fast_link_pulse" class="mw-redirect" title="Fast link pulse">fast link pulse</a> (FLP) on the transmit pair. The PD (device) connects the transmit line to the receive line via a <a href="/wiki/Low-pass_filter" title="Low-pass filter">low-pass filter</a>. The PSE gets the FLP in return. The PSE will provide a common mode current between pairs 1 and 2, resulting in <span class="nowrap">48 V DC</span><sup id="cite_ref-ciscopress_ciscophone_52-0" class="reference"><a href="#cite_note-ciscopress_ciscophone-52"><span class="cite-bracket">[</span>50<span class="cite-bracket">]</span></a></sup> and <span class="nowrap">6.3 W</span><sup id="cite_ref-conticomp_CAT6500POE_ds_53-0" class="reference"><a href="#cite_note-conticomp_CAT6500POE_ds-53"><span class="cite-bracket">[</span>51<span class="cite-bracket">]</span></a></sup> default of allocated power. The PD must then provide Ethernet link within <span class="nowrap">5 seconds</span> to the auto-negotiation mode switch port. A later CDP message with a TLV tells the PSE its final power requirement. A discontinuation of link pulses shuts down power.<sup id="cite_ref-cisco_technote00_54-0" class="reference"><a href="#cite_note-cisco_technote00-54"><span class="cite-bracket">[</span>52<span class="cite-bracket">]</span></a></sup> </p><p><span class="anchor" id="UPOE"></span>In 2014, Cisco created another non-standard PoE implementation called <b><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238216509"><span class="vanchor"><span id="Universal_Power_over_Ethernet"></span><span class="vanchor-text">Universal Power over Ethernet</span></span></b> (<b>UPOE</b>). UPOE can use all 4 pairs, after negotiation, to supply up to 60 W.<sup id="cite_ref-55" class="reference"><a href="#cite_note-55"><span class="cite-bracket">[</span>53<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Analog_Devices"><span class="anchor" id="LTPoE++"></span>Analog Devices</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=16" title="Edit section: Analog Devices"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A proprietary high-power development called LTPoE++, using a single Cat 5e Ethernet cable, is capable of supplying varying levels at 38.7, 52.7, 70, and 90 W.<sup id="cite_ref-www.linear.com_56-0" class="reference"><a href="#cite_note-www.linear.com-56"><span class="cite-bracket">[</span>54<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Microsemi">Microsemi</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=17" title="Edit section: Microsemi"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/PowerDsine" title="PowerDsine">PowerDsine</a>, acquired by <a href="/wiki/Microsemi" title="Microsemi">Microsemi</a> in 2007, which was then acquired by Microchip in 2018, has been selling midspan power injectors since 1999. Using Microchip's multi-PoE PSE ICs, PoE injectors and switches can support the IEEE 802.3 PoE standards and also pre-standard configurations. Several companies such as <a href="/wiki/Polycom" class="mw-redirect" title="Polycom">Polycom</a>, <a href="/wiki/3Com" title="3Com">3Com</a>, <a href="/wiki/Lucent" class="mw-redirect" title="Lucent">Lucent</a> and <a href="/wiki/Nortel" title="Nortel">Nortel</a> used PowerDsine's older <i>Power over LAN</i> PoE implementation.<sup id="cite_ref-57" class="reference"><a href="#cite_note-57"><span class="cite-bracket">[</span>55<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Passive">Passive</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=18" title="Edit section: Passive"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In a passive PoE system, the injector does not communicate with the powered device to negotiate its voltage or wattage requirements, but merely supplies power at all times. Common 100 Mbit/s passive applications use the pinout of 802.3af mode B (see <a href="#Pinouts">§ Pinouts</a>) – with DC positive on pins 4 and 5 and DC negative on 7 and 8 and data on 1–2 and 3–6, but polarization may vary. Gigabit passive injectors use a transformer on the data pins to allow power and data to share the cable and are typically compatible with 802.3af Mode A. Passive midspan injectors with up to 12 ports are available. </p><p>Devices needing 5 volts cannot typically use PoE at 5 V on Ethernet cable beyond short distances (about 15 feet (4.6 m)) as the voltage drop of the cable becomes too significant, so a 24 V or 48 V to 5 V DC-DC converter is required at the remote end.<sup id="cite_ref-Active_5v_Splitter_manufacturer_58-0" class="reference"><a href="#cite_note-Active_5v_Splitter_manufacturer-58"><span class="cite-bracket">[</span>56<span class="cite-bracket">]</span></a></sup><sup class="noprint Inline-Template" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Reliable_sources" title="Wikipedia:Reliable sources"><span title="The material near this tag may rely on an unreliable source. (February 2020)">unreliable source?</span></a></i>]</sup> </p><p>Passive PoE power sources are commonly used with a variety of indoor and outdoor wireless radio equipment, most commonly from Motorola (now Cambium), <a href="/wiki/Ubiquiti_Networks" class="mw-redirect" title="Ubiquiti Networks">Ubiquiti Networks</a>, <a href="/wiki/MikroTik" title="MikroTik">MikroTik</a> and others. Earlier versions of passive PoE 24 VDC power sources shipped with 802.11a, 802.11g and 802.11n based radios are commonly 100 Mbit/s only. </p><p>Passive DC-to-DC injectors also exist which convert a 9 V to 36 V DC, or 36 V to 72 V DC power source to a stabilized 24 V 1 A, 48 V 0.5 A, or up to 48 V 2.0 A PoE feed with '+' on pins 4 & 5 and '−' on pins 7 & 8. These DC-to-DC PoE injectors are used in various telecom applications.<sup id="cite_ref-Passive_PoE_injector_manufacturer_59-0" class="reference"><a href="#cite_note-Passive_PoE_injector_manufacturer-59"><span class="cite-bracket">[</span>57<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Power_capacity_limits">Power capacity limits</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=19" title="Edit section: Power capacity limits"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/ISO/IEC" class="mw-redirect" title="ISO/IEC">ISO/IEC</a> TR 29125 and <a href="/wiki/Cenelec" class="mw-redirect" title="Cenelec">Cenelec</a> EN 50174-99-1 draft standards outline the cable bundle temperature rise that can be expected from the use of 4PPoE. A distinction is made between two scenarios: </p> <ol><li>bundles heating up from the inside to the outside, and</li> <li>bundles heating up from the outside to match the ambient temperature.</li></ol> <p>The second scenario largely depends on the environment and installation, whereas the first is solely influenced by the cable construction. In a standard unshielded cable, the PoE-related temperature rise increases by a factor of 5. In a shielded cable, this value drops to between 2.5 and 3, depending on the design. </p> <div class="mw-heading mw-heading2"><h2 id="Pinouts">Pinouts</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=20" title="Edit section: Pinouts"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <table class="wikitable" style="text-align: center;"> <caption>802.3af/at/bt standards A and B from the power sourcing equipment perspective (MDI-X) </caption> <tbody><tr> <th>Pins at switch </th> <th>T568A color </th> <th>T568B color </th> <th colspan="2">10/100 mode B, <br />DC on spares </th> <th colspan="2">10/100 mode A, <br />mixed DC & data </th> <th colspan="2">1000 (1 gigabit) mode B, <br />DC & bi-data </th> <th colspan="2">1000 (1 gigabit) mode A, <br />DC & bi-data </th> <th colspan="2">1000 (1 gigabit) mode A+B (4PPoE), <br />DC & bi-data<sup id="cite_ref-type34only_60-0" class="reference"><a href="#cite_note-type34only-60"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup> </th></tr> <tr> <th>Pin 1 </th> <td><span typeof="mw:File"><a href="/wiki/File:Wire_white_green_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/60px-Wire_white_green_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/90px-Wire_white_green_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/120px-Wire_white_green_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> White/green stripe </td> <td><span typeof="mw:File"><a href="/wiki/File:Wire_white_orange_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/60px-Wire_white_orange_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/90px-Wire_white_orange_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/120px-Wire_white_orange_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> White/orange stripe </td> <td>Rx +</td> <td> </td> <td>Rx +</td> <td>DC + </td> <td>TxRx A +</td> <td> </td> <td>TxRx A +</td> <td>DC + </td> <td>TxRx A +</td> <td>DC + </td></tr> <tr> <th>Pin 2 </th> <td><span typeof="mw:File"><a href="/wiki/File:Wire_green.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/60px-Wire_green.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/90px-Wire_green.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/120px-Wire_green.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> Green solid </td> <td><span typeof="mw:File"><a href="/wiki/File:Wire_orange.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/60px-Wire_orange.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/90px-Wire_orange.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/120px-Wire_orange.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> Orange solid </td> <td>Rx −</td> <td> </td> <td>Rx −</td> <td>DC + </td> <td>TxRx A −</td> <td> </td> <td>TxRx A −</td> <td>DC + </td> <td>TxRx A −</td> <td>DC + </td></tr> <tr> <th>Pin 3 </th> <td><span typeof="mw:File"><a href="/wiki/File:Wire_white_orange_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/60px-Wire_white_orange_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/90px-Wire_white_orange_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/dd/Wire_white_orange_stripe.svg/120px-Wire_white_orange_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br />White/orange stripe </td> <td><span typeof="mw:File"><a href="/wiki/File:Wire_white_green_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/60px-Wire_white_green_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/90px-Wire_white_green_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Wire_white_green_stripe.svg/120px-Wire_white_green_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> White/green stripe </td> <td>Tx +</td> <td> </td> <td>Tx +</td> <td>DC − </td> <td>TxRx B +</td> <td> </td> <td>TxRx B +</td> <td>DC − </td> <td>TxRx B +</td> <td>DC − </td></tr> <tr> <th>Pin 4 </th> <td colspan="2"><span typeof="mw:File"><a href="/wiki/File:Wire_blue.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Wire_blue.svg/60px-Wire_blue.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/de/Wire_blue.svg/90px-Wire_blue.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/de/Wire_blue.svg/120px-Wire_blue.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> Blue solid </td> <td></td> <td>DC + </td> <td colspan="2" rowspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">Unused </td> <td>TxRx C +</td> <td>DC + </td> <td>TxRx C +</td> <td> </td> <td>TxRx C +</td> <td>DC + </td></tr> <tr> <th>Pin 5 </th> <td colspan="2"><span typeof="mw:File"><a href="/wiki/File:Wire_white_blue_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/29/Wire_white_blue_stripe.svg/60px-Wire_white_blue_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/29/Wire_white_blue_stripe.svg/90px-Wire_white_blue_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/29/Wire_white_blue_stripe.svg/120px-Wire_white_blue_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> White/blue stripe </td> <td></td> <td>DC + </td> <td>TxRx C −</td> <td>DC + </td> <td>TxRx C −</td> <td> </td> <td>TxRx C −</td> <td>DC + </td></tr> <tr> <th>Pin 6 </th> <td><span typeof="mw:File"><a href="/wiki/File:Wire_orange.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/60px-Wire_orange.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/90px-Wire_orange.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Wire_orange.svg/120px-Wire_orange.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> Orange solid </td> <td><span typeof="mw:File"><a href="/wiki/File:Wire_green.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/60px-Wire_green.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/90px-Wire_green.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d9/Wire_green.svg/120px-Wire_green.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br />Green solid </td> <td>Tx −</td> <td> </td> <td>Tx −</td> <td>DC − </td> <td>TxRx B −</td> <td> </td> <td>TxRx B −</td> <td>DC − </td> <td>TxRx B −</td> <td>DC − </td></tr> <tr> <th>Pin 7 </th> <td colspan="2"><span typeof="mw:File"><a href="/wiki/File:Wire_white_brown_stripe.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Wire_white_brown_stripe.svg/60px-Wire_white_brown_stripe.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Wire_white_brown_stripe.svg/90px-Wire_white_brown_stripe.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Wire_white_brown_stripe.svg/120px-Wire_white_brown_stripe.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> White/brown stripe </td> <td></td> <td>DC − </td> <td colspan="2" rowspan="2" data-sort-value="" style="background: var(--background-color-interactive, #ececec); color: var(--color-base, inherit); vertical-align: middle; text-align: center;" class="table-na">Unused </td> <td>TxRx D +</td> <td>DC − </td> <td>TxRx D +</td> <td> </td> <td>TxRx D +</td> <td>DC − </td></tr> <tr> <th>Pin 8 </th> <td colspan="2"><span typeof="mw:File"><a href="/wiki/File:Wire_brown.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Wire_brown.svg/60px-Wire_brown.svg.png" decoding="async" width="60" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Wire_brown.svg/90px-Wire_brown.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Wire_brown.svg/120px-Wire_brown.svg.png 2x" data-file-width="1000" data-file-height="300" /></a></span><br /> Brown solid </td> <td></td> <td>DC − </td> <td>TxRx D −</td> <td>DC − </td> <td>TxRx D −</td> <td> </td> <td>TxRx D −</td> <td>DC − </td></tr> <tr> <td colspan="13" style="text-align: left;">Notes: <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-type34only-60"><span class="mw-cite-backlink"><b><a href="#cite_ref-type34only_60-0">^</a></b></span> <span class="reference-text">Only supported by 802.3bt for devices that identify as the newly added Type 3 or Type 4.<sup id="cite_ref-61" class="reference"><a href="#cite_note-61"><span class="cite-bracket">[</span>58<span class="cite-bracket">]</span></a></sup></span> </li> </ol></div></div> </td></tr></tbody></table> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=21" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation cs2"><i>802.3af-2003</i>, June 2003</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=802.3af-2003&rft.date=2003-06&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text">IEEE 802.3-2005, section 2, table 33-5, item 1</span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">IEEE 802.3-2005, section 2, table 33-5, item 4</span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text">IEEE 802.3-2005, section 2, table 33-5, item 14</span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">IEEE 802.3-2005, section 2, clause 33.3.5.2</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><i>802.3at Amendment 3: Data Terminal Equipment (DTE) Power via the Media Dependent Interface (MDI) Enhancements</i>, September 11, 2009</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=802.3at+Amendment+3%3A+Data+Terminal+Equipment+%28DTE%29+Power+via+the+Media+Dependent+Interface+%28MDI%29+Enhancements&rft.date=2009-09-11&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-standards.ieee.org-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-standards.ieee.org_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20121016220504/http://standards.ieee.org/news/">"Amendment to IEEE 802.3 Standard Enhances Power Management and Increases Available Power"</a>. IEEE. Archived from <a rel="nofollow" class="external text" href="http://standards.ieee.org/announcements/stdbd_approves_ieee802.3at.html">the original</a> on 2012-10-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2010-06-24</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Amendment+to+IEEE+802.3+Standard+Enhances+Power+Management+and+Increases+Available+Power&rft.pub=IEEE&rft_id=http%3A%2F%2Fstandards.ieee.org%2Fannouncements%2Fstdbd_approves_ieee802.3at.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">Clause 33.3.1 stating, "PDs that simultaneously require power from both Mode A and Mode B are specifically not allowed by this standard."</span> </li> <li id="cite_note-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-9">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><i>IEEE 802.3-2012 Standard for Ethernet</i>, <a href="/wiki/IEEE_Standards_Association" title="IEEE Standards Association">IEEE Standards Association</a>, December 28, 2012</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=IEEE+802.3-2012+Standard+for+Ethernet&rft.pub=IEEE+Standards+Association&rft.date=2012-12-28&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text">Clause 33.3.1 stating, "A PD may indicate the ability to accept power on both pairsets from a Clause 145 PSE using TLV variable PD 4PID."</span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</a></b></span> <span class="reference-text">IEEE 802.3bt <i>145.1.3 System parameters</i></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.ieee802.org/3/bt/public/jan16/hstewart_02_0116_baseline.pdf">"IEEE P802.3bt/D1.5 Draft Standard for Ethernet – Amendment: Physical Layer and Management Parameters for DTE Power via MDI over 4-Pair"</a> <span class="cs1-format">(PDF)</span>. 30 November 2015. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170410051052/http://www.ieee802.org/3/bt/public/jan16/hstewart_02_0116_baseline.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2017-04-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-04-09</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=IEEE+P802.3bt%2FD1.5+Draft+Standard+for+Ethernet+%E2%80%93+Amendment%3A+Physical+Layer+and+Management+Parameters+for+DTE+Power+via+MDI+over+4-Pair&rft.date=2015-11-30&rft_id=http%3A%2F%2Fwww.ieee802.org%2F3%2Fbt%2Fpublic%2Fjan16%2Fhstewart_02_0116_baseline.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.ieee802.org/3/bu/index.html">"IEEE P802.3bu 1-Pair Power over Data Lines (PoDL) Task Force"</a>. 2017-03-17. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171010063853/http://www.ieee802.org/3/bu/index.html">Archived</a> from the original on 2017-10-10<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-10-30</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=IEEE+P802.3bu+1-Pair+Power+over+Data+Lines+%28PoDL%29+Task+Force&rft.date=2017-03-17&rft_id=http%3A%2F%2Fwww.ieee802.org%2F3%2Fbu%2Findex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.eenewsautomotive.com/news/new-automotive-power-over-ethernet-standard-extends-wattage-range">"Automotive power-over-Ethernet standard extends wattage range"</a>. 2017-03-13. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20210122004440/https://www.eenewsautomotive.com/news/new-automotive-power-over-ethernet-standard-extends-wattage-range">Archived</a> from the original on 2021-01-22<span class="reference-accessdate">. Retrieved <span class="nowrap">2021-01-16</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Automotive+power-over-Ethernet+standard+extends+wattage+range&rft.date=2017-03-13&rft_id=https%3A%2F%2Fwww.eenewsautomotive.com%2Fnews%2Fnew-automotive-power-over-ethernet-standard-extends-wattage-range&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-802.3cg-15"><span class="mw-cite-backlink">^ <a href="#cite_ref-802.3cg_15-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-802.3cg_15-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3cg-2019</span> </li> <li id="cite_note-16"><span class="mw-cite-backlink"><b><a href="#cite_ref-16">^</a></b></span> <span class="reference-text">IEEE 802.3ch-2020</span> </li> <li id="cite_note-PoE_enabled_devices-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-PoE_enabled_devices_17-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110829043155/http://www.garrettcom.co.uk/power-over-ethernet">"Power over Ethernet"</a>. <i>Commercial web page</i>. GarrettCom. Archived from <a rel="nofollow" class="external text" href="http://www.garrettcom.co.uk/power-over-ethernet">the original</a> on August 29, 2011<span class="reference-accessdate">. Retrieved <span class="nowrap">August 6,</span> 2011</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Commercial+web+page&rft.atitle=Power+over+Ethernet&rft_id=http%3A%2F%2Fwww.garrettcom.co.uk%2Fpower-over-ethernet&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-POE_LED_Lighting-18"><span class="mw-cite-backlink"><b><a href="#cite_ref-POE_LED_Lighting_18-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMakdessian" class="citation web cs1">Makdessian, Alec M. <a rel="nofollow" class="external text" href="https://www.maximintegrated.com/content/dam/files/design/technical-documents/white-papers/led-white-paper.pdf">"The Bright New Outlook For LEDs: New Drivers, New Possibilities"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/Maxim_Integrated" title="Maxim Integrated">Maxim Integrated</a></i>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221208160026/https://www.maximintegrated.com/content/dam/files/design/technical-documents/white-papers/led-white-paper.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 8 December 2022<span class="reference-accessdate">. Retrieved <span class="nowrap">17 February</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Maxim+Integrated&rft.atitle=The+Bright+New+Outlook+For+LEDs%3A+New+Drivers%2C+New+Possibilities&rft.aulast=Makdessian&rft.aufirst=Alec+M.&rft_id=https%3A%2F%2Fwww.maximintegrated.com%2Fcontent%2Fdam%2Ffiles%2Fdesign%2Ftechnical-documents%2Fwhite-papers%2Fled-white-paper.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-19"><span class="mw-cite-backlink"><b><a href="#cite_ref-19">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.veracityglobal.com/products/ethernet-and-poe-devices/outreach-max.aspx">"Ethernet Extender for POE and POE Plus equipment"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20150930060346/http://www.veracityglobal.com/products/ethernet-and-poe-devices/outreach-max.aspx">Archived</a> from the original on 2015-09-30<span class="reference-accessdate">. Retrieved <span class="nowrap">2015-10-26</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Ethernet+Extender+for+POE+and+POE+Plus+equipment&rft_id=http%3A%2F%2Fwww.veracityglobal.com%2Fproducts%2Fethernet-and-poe-devices%2Foutreach-max.aspx&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-20"><span class="mw-cite-backlink"><b><a href="#cite_ref-20">^</a></b></span> <span class="reference-text">Cisco Aironet technotes on <a rel="nofollow" class="external text" href="http://www.cisco.com/en/US/docs/wireless/technology/poe/technical/reference/Power.html#wp40055">1000BASE-T mid-span devices</a>, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110802220854/http://www.cisco.com/en/US/docs/wireless/technology/poe/technical/reference/Power.html#wp40055">Archived</a> 2011-08-02 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> visited 18 July 2011</span> </li> <li id="cite_note-802.3-2008,_33.3.5_PD_Power-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3-2008,_33.3.5_PD_Power_21-0">^</a></b></span> <span class="reference-text">IEEE 802.3-2008, section 2, clause 33.3.5</span> </li> <li id="cite_note-802.3at-2009,_33.3.7_PD_Power-22"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3at-2009,_33.3.7_PD_Power_22-0">^</a></b></span> <span class="reference-text">IEEE 802.3at-2009, clause 33.3.7</span> </li> <li id="cite_note-23"><span class="mw-cite-backlink"><b><a href="#cite_ref-23">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDave_Dwelley2003" class="citation cs2">Dave Dwelley (Oct 26, 2003), <a rel="nofollow" class="external text" href="http://www.electronicdesign.com/displays/banish-those-wall-warts-power-over-ethernet">"Banish Those "Wall Warts" With Power Over Ethernet"</a>, <i>Electronic Design</i>, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20171126003421/http://www.electronicdesign.com/displays/banish-those-wall-warts-power-over-ethernet">archived</a> from the original on 2017-11-26<span class="reference-accessdate">, retrieved <span class="nowrap">2018-07-21</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Electronic+Design&rft.atitle=Banish+Those+%22Wall+Warts%22+With+Power+Over+Ethernet&rft.date=2003-10-26&rft.au=Dave+Dwelley&rft_id=http%3A%2F%2Fwww.electronicdesign.com%2Fdisplays%2Fbanish-those-wall-warts-power-over-ethernet&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-24"><span class="mw-cite-backlink"><b><a href="#cite_ref-24">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFDavid_TremblayLennart_Yseboodt2017" class="citation cs2">David Tremblay; Lennart Yseboodt (November 10, 2017), <a rel="nofollow" class="external text" href="https://www.cablinginstall.com/articles/2017/110/power-over-ethernet-cable-losses-ethernet-alliance.html">"Clarifying misperceptions about Power over Ethernet and cable losses"</a>, <i>Cabling Installation and Maintenance</i>, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20180722011438/https://www.cablinginstall.com/articles/2017/110/power-over-ethernet-cable-losses-ethernet-alliance.html">archived</a> from the original on 2018-07-22<span class="reference-accessdate">, retrieved <span class="nowrap">2018-07-21</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Cabling+Installation+and+Maintenance&rft.atitle=Clarifying+misperceptions+about+Power+over+Ethernet+and+cable+losses&rft.date=2017-11-10&rft.au=David+Tremblay&rft.au=Lennart+Yseboodt&rft_id=https%3A%2F%2Fwww.cablinginstall.com%2Farticles%2F2017%2F110%2Fpower-over-ethernet-cable-losses-ethernet-alliance.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-marvell1-25"><span class="mw-cite-backlink"><b><a href="#cite_ref-marvell1_25-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFRoman_KleinermanDaniel_Feldman2011" class="citation cs2">Roman Kleinerman; Daniel Feldman (May 2011), <a rel="nofollow" class="external text" href="http://www.marvell.com/switching/assets/Marvell-PoE-An-Energy-Efficient-Alternative.pdf"><i>Power over Ethernet (PoE): An Energy-Efficient Alternative</i></a> <span class="cs1-format">(PDF)</span>, Marvell, <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160416004558/http://www.marvell.com/switching/assets/Marvell-PoE-An-Energy-Efficient-Alternative.pdf">archived</a> <span class="cs1-format">(PDF)</span> from the original on 2016-04-16<span class="reference-accessdate">, retrieved <span class="nowrap">2016-08-31</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Power+over+Ethernet+%28PoE%29%3A+An+Energy-Efficient+Alternative&rft.pub=Marvell&rft.date=2011-05&rft.au=Roman+Kleinerman&rft.au=Daniel+Feldman&rft_id=http%3A%2F%2Fwww.marvell.com%2Fswitching%2Fassets%2FMarvell-PoE-An-Energy-Efficient-Alternative.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-33.1.1c-26"><span class="mw-cite-backlink">^ <a href="#cite_ref-33.1.1c_26-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-33.1.1c_26-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-33.1.1c_26-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009, clause 33.1.1c</span> </li> <li id="cite_note-802.3bt_0514-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3bt_0514_27-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKoussalya_BalasubramanianDavid_Abramson2014" class="citation web cs1">Koussalya Balasubramanian; David Abramson (May 2014). <a rel="nofollow" class="external text" href="http://www.ieee802.org/3/bt/public/may14/abramson_01_0514.pdf">"Base Line Text for IEEE 802.3 BT"</a> <span class="cs1-format">(PDF)</span>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170402082938/http://www.ieee802.org/3/bt/public/may14/abramson_01_0514.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2017-04-02<span class="reference-accessdate">. Retrieved <span class="nowrap">2017-04-02</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Base+Line+Text+for+IEEE+802.3+BT&rft.date=2014-05&rft.au=Koussalya+Balasubramanian&rft.au=David+Abramson&rft_id=http%3A%2F%2Fwww.ieee802.org%2F3%2Fbt%2Fpublic%2Fmay14%2Fabramson_01_0514.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://ethernetalliance.org/wp-content/uploads/2018/04/WP_EA_Overview8023bt_FINAL.pdf"><i>Overview of 802.3bt - Power over Ethernet standard</i></a> <span class="cs1-format">(PDF)</span>, <a href="/wiki/Ethernet_Alliance" title="Ethernet Alliance">Ethernet Alliance</a><span class="reference-accessdate">, retrieved <span class="nowrap">2024-08-19</span></span></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Overview+of+802.3bt+-+Power+over+Ethernet+standard&rft.pub=Ethernet+Alliance&rft_id=https%3A%2F%2Fethernetalliance.org%2Fwp-content%2Fuploads%2F2018%2F04%2FWP_EA_Overview8023bt_FINAL.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-Table_33.11-30"><span class="mw-cite-backlink">^ <a href="#cite_ref-Table_33.11_30-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Table_33.11_30-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009 Table 33-11</span> </li> <li id="cite_note-Table_33.18-31"><span class="mw-cite-backlink">^ <a href="#cite_ref-Table_33.18_31-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Table_33.18_31-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009 Table 33-18</span> </li> <li id="cite_note-Table_145-1-32"><span class="mw-cite-backlink">^ <a href="#cite_ref-Table_145-1_32-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Table_145-1_32-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-Table_145-1_32-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-Table_145-1_32-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text">IEEE 802.3bt Table 145-1</span> </li> <li id="cite_note-table_33-1-33"><span class="mw-cite-backlink">^ <a href="#cite_ref-table_33-1_33-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-table_33-1_33-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009 Table 33-1</span> </li> <li id="cite_note-33.1.4-34"><span class="mw-cite-backlink">^ <a href="#cite_ref-33.1.4_34-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-33.1.4_34-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009 <i>33.1.4 Type 1 and Type 2 system parameters</i></span> </li> <li id="cite_note-35"><span class="mw-cite-backlink"><b><a href="#cite_ref-35">^</a></b></span> <span class="reference-text">IEEE 802.3bt <i>145.3.1 PD Type definitions</i></span> </li> <li id="cite_note-bt_temp-36"><span class="mw-cite-backlink"><b><a href="#cite_ref-bt_temp_36-0">^</a></b></span> <span class="reference-text">IEEE 802.3bt <i>145.1.3.1 Cabling requirements</i></span> </li> <li id="cite_note-38"><span class="mw-cite-backlink"><b><a href="#cite_ref-38">^</a></b></span> <span class="reference-text">IEEE 802.3 <i>33.3.1 PD PI</i></span> </li> <li id="cite_note-39"><span class="mw-cite-backlink"><b><a href="#cite_ref-39">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHerboldDwelley2003" class="citation cs2">Herbold, Jacob; Dwelley, Dave (27 October 2003), <a rel="nofollow" class="external text" href="https://web.archive.org/web/20050320054651/http://elecdesign.com/Articles/Index.cfm?ArticleID=5945&pg=3">"Banish Those "Wall Warts" With Power Over Ethernet"</a>, <i>Electronic Design</i>, <b>51</b> (24): 61, archived from <a rel="nofollow" class="external text" href="http://elecdesign.com/Articles/Index.cfm?ArticleID=5945&pg=3">the original</a> on 2005-03-20</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Electronic+Design&rft.atitle=Banish+Those+%22Wall+Warts%22+With+Power+Over+Ethernet&rft.volume=51&rft.issue=24&rft.pages=61&rft.date=2003-10-27&rft.aulast=Herbold&rft.aufirst=Jacob&rft.au=Dwelley%2C+Dave&rft_id=http%3A%2F%2Felecdesign.com%2FArticles%2FIndex.cfm%3FArticleID%3D5945%26pg%3D3&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-802.3-2008,_section_2,_table_33-12-40"><span class="mw-cite-backlink">^ <a href="#cite_ref-802.3-2008,_section_2,_table_33-12_40-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-802.3-2008,_section_2,_table_33-12_40-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3-2008, section 2, table 33-12</span> </li> <li id="cite_note-802.3at,_table_33-18-41"><span class="mw-cite-backlink">^ <a href="#cite_ref-802.3at,_table_33-18_41-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-802.3at,_table_33-18_41-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">IEEE 802.3at-2009, table 33-18</span> </li> <li id="cite_note-linear-LTC4278_ds-42"><span class="mw-cite-backlink"><b><a href="#cite_ref-linear-LTC4278_ds_42-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20110713210954/http://cds.linear.com/docs/Datasheet/4278fa.pdf">"LTC4278 IEEE 802.3at PD with Synchronous No-Opto Flyback Controller and 12V Aux Support"</a> <span class="cs1-format">(PDF)</span>. <i>cds.linear.com</i>. p. 15. Archived from <a rel="nofollow" class="external text" href="http://cds.linear.com/docs/Datasheet/4278fa.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2011-07-13.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=cds.linear.com&rft.atitle=LTC4278+IEEE+802.3at+PD+with+Synchronous+No-Opto+Flyback+Controller+and+12V+Aux+Support&rft.pages=15&rft_id=http%3A%2F%2Fcds.linear.com%2Fdocs%2FDatasheet%2F4278fa.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-802.3s2t33.3-43"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3s2t33.3_43-0">^</a></b></span> <span class="reference-text">IEEE 802.3-2018, section 2, table 33-9</span> </li> <li id="cite_note-44"><span class="mw-cite-backlink"><b><a href="#cite_ref-44">^</a></b></span> <span class="reference-text">IEEE 802.3bt, table 145-26</span> </li> <li id="cite_note-802.3,_section_2,_33.3.4-45"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3,_section_2,_33.3.4_45-0">^</a></b></span> <span class="reference-text">IEEE 802.3-2008, section 2, clause 33.3.4</span> </li> <li id="cite_note-802.3_PoETLV-46"><span class="mw-cite-backlink"><b><a href="#cite_ref-802.3_PoETLV_46-0">^</a></b></span> <span class="reference-text">IEEE 802.3 Clause 79.3.2 <i>Power Via MDI TLV</i></span> </li> <li id="cite_note-RFC3621-47"><span class="mw-cite-backlink">^ <a href="#cite_ref-RFC3621_47-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-RFC3621_47-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-RFC3621_47-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-RFC3621_47-3"><sup><i><b>d</b></i></sup></a></span> <span class="reference-text">IETF <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><a href="/wiki/RFC_(identifier)" class="mw-redirect" title="RFC (identifier)">RFC</a> <a rel="nofollow" class="external text" href="https://datatracker.ietf.org/doc/html/rfc3621">3621</a></span> </li> <li id="cite_note-48"><span class="mw-cite-backlink"><b><a href="#cite_ref-48">^</a></b></span> <span class="reference-text">IEEE 802.1AB-2009 Annex F.3 <i>Power Via MDI TLV</i></span> </li> <li id="cite_note-ieee802-lldp-med-prop2006-49"><span class="mw-cite-backlink">^ <a href="#cite_ref-ieee802-lldp-med-prop2006_49-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ieee802-lldp-med-prop2006_49-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.ieee802.org/1/files/public/docs2006/ab-congdon-lldp-med-8023at-0906.pdf">"LLDP / LLDP-MED Proposal for PoE Plus (2006-09-15)"</a> <span class="cs1-format">(PDF)</span>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100923081119/http://www.ieee802.org/1/files/public/docs2006/ab-congdon-lldp-med-8023at-0906.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on 2010-09-23<span class="reference-accessdate">. Retrieved <span class="nowrap">2010-01-10</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=LLDP+%2F+LLDP-MED+Proposal+for+PoE+Plus+%282006-09-15%29&rft_id=http%3A%2F%2Fwww.ieee802.org%2F1%2Ffiles%2Fpublic%2Fdocs2006%2Fab-congdon-lldp-med-8023at-0906.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span>2010-01-10</span> </li> <li id="cite_note-50"><span class="mw-cite-backlink"><b><a href="#cite_ref-50">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://pinoutguide.com/Net/poe_pinout.shtml#poeprop">"Power over Ethernet (POE) proprietary pinouts"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Power+over+Ethernet+%28POE%29+proprietary+pinouts&rft_id=https%3A%2F%2Fpinoutguide.com%2FNet%2Fpoe_pinout.shtml%23poeprop&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-pinout-51"><span class="mw-cite-backlink"><b><a href="#cite_ref-pinout_51-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150401193537/http://pinoutsguide.com/Net/poe_pinout.shtml">"Power over Ethernet (POE) pinout"</a>. Archived from <a rel="nofollow" class="external text" href="http://pinoutsguide.com/Net/poe_pinout.shtml">the original</a> on 2015-04-01.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Power+over+Ethernet+%28POE%29+pinout&rft_id=http%3A%2F%2Fpinoutsguide.com%2FNet%2Fpoe_pinout.shtml&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-ciscopress_ciscophone-52"><span class="mw-cite-backlink"><b><a href="#cite_ref-ciscopress_ciscophone_52-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.ciscopress.com/articles/article.asp?p=385336&seqNum=2&rll=1">"Planning for Cisco IP Telephony > Network Infrastructure Analysis"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20110708155947/http://www.ciscopress.com/articles/article.asp?p=385336&seqNum=2&rll=1">Archived</a> from the original on 2011-07-08<span class="reference-accessdate">. Retrieved <span class="nowrap">2010-01-12</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Planning+for+Cisco+IP+Telephony+%3E+Network+Infrastructure+Analysis&rft_id=http%3A%2F%2Fwww.ciscopress.com%2Farticles%2Farticle.asp%3Fp%3D385336%26seqNum%3D2%26rll%3D1&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span> 2010-01-12 ciscopress.com</span> </li> <li id="cite_note-conticomp_CAT6500POE_ds-53"><span class="mw-cite-backlink"><b><a href="#cite_ref-conticomp_CAT6500POE_ds_53-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.webcitation.org/5u2FxkQis?url=http://www.conticomp.com/PDF/CAT6500POE_ds.pdf">"Power over Ethernet on the Cisco Catalyst 6500 Series Switch"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="http://www.conticomp.com/PDF/CAT6500POE_ds.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2010-11-06.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Power+over+Ethernet+on+the+Cisco+Catalyst+6500+Series+Switch&rft_id=http%3A%2F%2Fwww.conticomp.com%2FPDF%2FCAT6500POE_ds.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span> 2010-01-12 conticomp.com</span> </li> <li id="cite_note-cisco_technote00-54"><span class="mw-cite-backlink"><b><a href="#cite_ref-cisco_technote00_54-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a00801189b5.shtml">"Understanding the Cisco IP Phone 10/100 Ethernet In-Line Power Detection Algorithm - Cisco Systems"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20090202164951/http://cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a00801189b5.shtml">Archived</a> from the original on 2009-02-02<span class="reference-accessdate">. Retrieved <span class="nowrap">2010-01-12</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Understanding+the+Cisco+IP+Phone+10%2F100+Ethernet+In-Line+Power+Detection+Algorithm+-+Cisco+Systems&rft_id=http%3A%2F%2Fwww.cisco.com%2Fen%2FUS%2Fproducts%2Fhw%2Fphones%2Fps379%2Fproducts_tech_note09186a00801189b5.shtml&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span> 2010-01-12 cisco.com</span> </li> <li id="cite_note-55"><span class="mw-cite-backlink"><b><a href="#cite_ref-55">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20171128140727/http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4500-series-switches/white_paper_c11-670993.html">"Cisco Universal Power Over Ethernet - Unleash the Power of your Network White Paper"</a>. Cisco Systems. 2014-07-11. Archived from <a rel="nofollow" class="external text" href="http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4500-series-switches/white_paper_c11-670993.html">the original</a> on 2017-11-28.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Cisco+Universal+Power+Over+Ethernet+-+Unleash+the+Power+of+your+Network+White+Paper&rft.pub=Cisco+Systems&rft.date=2014-07-11&rft_id=http%3A%2F%2Fwww.cisco.com%2Fc%2Fen%2Fus%2Fproducts%2Fcollateral%2Fswitches%2Fcatalyst-4500-series-switches%2Fwhite_paper_c11-670993.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-www.linear.com-56"><span class="mw-cite-backlink"><b><a href="#cite_ref-www.linear.com_56-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.linear.com/products/power-over-ethernet_(poe)_interface_controllers">"Power over Ethernet Interface Controllers"</a>. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160720141040/http://www.linear.com/products/Power-Over-Ethernet_(PoE)_Interface_Controllers">Archived</a> from the original on 2016-07-20<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-07-27</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Power+over+Ethernet+Interface+Controllers&rft_id=http%3A%2F%2Fwww.linear.com%2Fproducts%2Fpower-over-ethernet_%28poe%29_interface_controllers&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-57"><span class="mw-cite-backlink"><b><a href="#cite_ref-57">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation cs2"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120728191203/http://www.poweroverethernet.com/sponsors.php?sponsor_id=12"><i>PowerDsine Limited</i></a>, archived from <a rel="nofollow" class="external text" href="http://www.poweroverethernet.com/sponsors.php?sponsor_id=12">the original</a> on 2012-07-28</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=PowerDsine+Limited&rft_id=http%3A%2F%2Fwww.poweroverethernet.com%2Fsponsors.php%3Fsponsor_id%3D12&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-Active_5v_Splitter_manufacturer-58"><span class="mw-cite-backlink"><b><a href="#cite_ref-Active_5v_Splitter_manufacturer_58-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20130702011332/http://wifiqos.com/foscam.php">"5 volt power over ethernet adapters"</a>. Archived from <a rel="nofollow" class="external text" href="http://wifiqos.com/foscam.php">the original</a> on 2013-07-02.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=5+volt+power+over+ethernet+adapters&rft_id=http%3A%2F%2Fwifiqos.com%2Ffoscam.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-Passive_PoE_injector_manufacturer-59"><span class="mw-cite-backlink"><b><a href="#cite_ref-Passive_PoE_injector_manufacturer_59-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20100620210314/http://tyconpower.com/products/POE.htm">"Passive Power over Ethernet equipment, AC-DC and DC-DC"</a>. Archived from <a rel="nofollow" class="external text" href="http://tyconpower.com/products/POE.htm">the original</a> on 2010-06-20.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Passive+Power+over+Ethernet+equipment%2C+AC-DC+and+DC-DC&rft_id=http%3A%2F%2Ftyconpower.com%2Fproducts%2FPOE.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3APower+over+Ethernet" class="Z3988"></span></span> </li> <li id="cite_note-61"><span class="mw-cite-backlink"><b><a href="#cite_ref-61">^</a></b></span> <span class="reference-text">IEEE 802.3bt-2018, clause 145.2.9 stating "A PSE shall not apply 4-pair power unless the PSE [...] has identified the PD as Type 3 or Type 4."</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Power_over_Ethernet&action=edit&section=22" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://ieeexplore.ieee.org/browse/standards/get-program/page/series?id=68">IEEE GET Program for free download of standards after registration</a></li> <li><a rel="nofollow" class="external text" href="http://www.ieee802.org/3/af/">ieee802.org: IEEE 802.3af Task Force</a></li> <li><a rel="nofollow" class="external text" href="http://www.ieee802.org/3/at/">ieee802.org: IEEE 802.3at Task Force</a></li> <li><a rel="nofollow" class="external text" href="http://www.ieee802.org/3/bt/">ieee802.org: IEEE 802.3bt Task Force</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output 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href="/wiki/Template:Ethernet" title="Template:Ethernet"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Ethernet" title="Template talk:Ethernet"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Ethernet" title="Special:EditPage/Template:Ethernet"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Ethernet_family_of_local_area_network_technologies" style="font-size:114%;margin:0 4em"><a href="/wiki/Ethernet" title="Ethernet">Ethernet</a> family of <a href="/wiki/Local_area_network" title="Local area network">local area network</a> technologies</div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">Speeds</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Classic_Ethernet" title="Classic Ethernet">10 Mbit/s</a></li> <li><a href="/wiki/Fast_Ethernet" title="Fast Ethernet">100 Mbit/s</a></li> <li><a href="/wiki/Gigabit_Ethernet" title="Gigabit Ethernet">1 Gbit/s</a></li> <li><a href="/wiki/2.5GBASE-T_and_5GBASE-T" title="2.5GBASE-T and 5GBASE-T">2.5 and 5 Gbit/s</a></li> <li><a href="/wiki/10_Gigabit_Ethernet" title="10 Gigabit Ethernet">10 Gbit/s</a></li> <li><a href="/wiki/25_Gigabit_Ethernet" title="25 Gigabit Ethernet">25 and 50 Gbit/s</a></li> <li><a href="/wiki/100_Gigabit_Ethernet" title="100 Gigabit Ethernet">40 and 100 Gbit/s</a></li> <li><a href="/wiki/Terabit_Ethernet" title="Terabit Ethernet">200, 400, 800 and 1600 Gbit/s</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">General</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ethernet_physical_layer" title="Ethernet physical layer">Physical layer</a></li> <li><a href="/wiki/Autonegotiation" title="Autonegotiation">Autonegotiation</a></li> <li><a href="/wiki/EtherType" title="EtherType">EtherType</a></li> <li><a href="/wiki/Ethernet_flow_control" title="Ethernet flow control">Flow control</a></li> <li><a href="/wiki/Ethernet_frame" title="Ethernet frame">Frames</a></li> <li><a href="/wiki/Jumbo_frame" title="Jumbo frame">Jumbos</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Organizations</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/IEEE_802.3" title="IEEE 802.3">IEEE 802.3</a></li> <li><a href="/wiki/Ethernet_Alliance" title="Ethernet Alliance">Ethernet Alliance</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Media</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Ethernet_over_fiber" title="Ethernet over fiber">Fiber</a></li> <li><a href="/wiki/Ethernet_over_twisted_pair" title="Ethernet over twisted pair">Twisted pair</a></li> <li><a href="/wiki/Ethernet_over_coax" title="Ethernet over coax">Coaxial</a></li> <li><a href="/wiki/Ethernet_in_the_first_mile" title="Ethernet in the first mile">First mile</a> <ul><li><a href="/wiki/10G-EPON" title="10G-EPON">10G-EPON</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Historic</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Carrier-sense_multiple_access_with_collision_detection" title="Carrier-sense multiple access with collision detection">CSMA/CD</a></li> <li><a href="/wiki/StarLAN" title="StarLAN">StarLAN</a></li> <li><a href="/wiki/10BROAD36" title="10BROAD36">10BROAD36</a></li> <li><a href="/wiki/10BASE-FB" class="mw-redirect" title="10BASE-FB">10BASE-FB</a></li> <li><a href="/wiki/10BASE-FL" class="mw-redirect" title="10BASE-FL">10BASE-FL</a></li> <li><a href="/wiki/10BASE5" title="10BASE5">10BASE5</a></li> <li><a href="/wiki/10BASE2" title="10BASE2">10BASE2</a></li> <li><a href="/wiki/Medium_Attachment_Unit" title="Medium Attachment Unit">MAU</a></li> <li><a href="/wiki/Fiber-optic_inter-repeater_link" class="mw-redirect" title="Fiber-optic inter-repeater link">FOIRL</a></li> <li><a href="/wiki/100BaseVG" title="100BaseVG">100BaseVG</a></li> <li><a href="/wiki/LattisNet" title="LattisNet">LattisNet</a></li> <li><a href="/wiki/Long_Reach_Ethernet" title="Long Reach Ethernet">Long Reach</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Applications</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Audio_over_Ethernet" title="Audio over Ethernet">Audio</a></li> <li><a href="/wiki/Automotive_Ethernet" class="mw-redirect" title="Automotive Ethernet">Automotive</a></li> <li><a href="/wiki/Carrier_Ethernet" title="Carrier Ethernet">Carrier</a></li> <li><a href="/wiki/Data_center_bridging" title="Data center bridging">Data center</a></li> <li><a href="/wiki/Energy-Efficient_Ethernet" title="Energy-Efficient Ethernet">Energy Efficiency</a></li> <li><a href="/wiki/Industrial_Ethernet" title="Industrial Ethernet">Industrial</a></li> <li><a href="/wiki/Metro_Ethernet" title="Metro Ethernet">Metro</a></li> <li><a class="mw-selflink selflink">Power</a></li> <li><a href="/wiki/Synchronous_Ethernet" title="Synchronous Ethernet">Synchronous</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Transceiver" title="Transceiver">Transceivers</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Gigabit_interface_converter" title="Gigabit interface converter">GBIC</a></li> <li><a href="/wiki/Small_Form-factor_Pluggable" title="Small Form-factor Pluggable">SFP/SFP+/QSFP/QSFP+/OSFP</a></li> <li><a href="/wiki/XENPAK" title="XENPAK">XENPAK</a>/<a href="/wiki/X2_transceiver" title="X2 transceiver">X2</a></li> <li><a href="/wiki/XFP_transceiver" title="XFP transceiver">XFP</a></li> <li><a href="/wiki/C_form-factor_pluggable" title="C form-factor pluggable">CFP</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Interfaces</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Attachment_Unit_Interface" title="Attachment Unit Interface">AUI</a></li> <li><a href="/wiki/EAD_socket" title="EAD socket">EAD</a></li> <li><a href="/wiki/Medium-dependent_interface" title="Medium-dependent interface">MDI</a></li> <li><a href="/wiki/Media-independent_interface" title="Media-independent interface">MII</a></li> <li><a href="/wiki/Gigabit_media-independent_interface" class="mw-redirect" title="Gigabit media-independent interface">GMII</a></li> <li><a href="/wiki/10_gigabit_media-independent_interface" class="mw-redirect" title="10 gigabit media-independent interface">XGMII</a></li> <li><a href="/wiki/XAUI" title="XAUI">XAUI</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <b><a href="/wiki/Category:Ethernet" 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