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Available in 15 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-15" 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">15 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D1%8D%D0%B3%D0%BE%D1%80%D1%8B%D1%8F:%D0%A0%D1%8D%D0%BA%D0%B0%D0%BC%D1%8D%D0%BD%D0%B4%D0%B0%D1%86%D1%8B%D1%96_ITU-T" title="Катэгорыя:Рэкамэндацыі ITU-T – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Катэгорыя:Рэкамэндацыі ITU-T" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Kategorie:ITU-T_doporu%C4%8Den%C3%AD" title="Kategorie:ITU-T doporučení – Czech" lang="cs" hreflang="cs" data-title="Kategorie:ITU-T doporučení" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Kategorie:ITU-Empfehlung" title="Kategorie:ITU-Empfehlung – German" lang="de" hreflang="de" data-title="Kategorie:ITU-Empfehlung" 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/Categor%C3%ADa:Recomendaciones_ITU-T" title="Categoría:Recomendaciones ITU-T – Spanish" lang="es" hreflang="es" data-title="Categoría:Recomendaciones ITU-T" 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%B1%D8%AF%D9%87:%D9%BE%DB%8C%D8%B4%D9%86%D9%87%D8%A7%D8%AF%D9%87%D8%A7%DB%8C_%D8%A8%D8%AE%D8%B4_%D8%A7%D8%B3%D8%AA%D8%A7%D9%86%D8%AF%D8%A7%D8%B1%D8%AF%D8%B3%D8%A7%D8%B2%DB%8C_%D9%85%D8%AE%D8%A7%D8%A8%D8%B1%D8%A7%D8%AA_%D8%A7%D8%AA%D8%AD%D8%A7%D8%AF%DB%8C%D9%87_%D8%A8%DB%8C%D9%86%E2%80%8C%D8%A7%D9%84%D9%85%D9%84%D9%84%DB%8C_%D9%85%D8%AE%D8%A7%D8%A8%D8%B1%D8%A7%D8%AA" title="رده:پیشنهادهای بخش استانداردسازی مخابرات اتحادیه بین‌المللی مخابرات – Persian" lang="fa" hreflang="fa" data-title="رده:پیشنهادهای بخش استانداردسازی مخابرات اتحادیه بین‌المللی مخابرات" 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/Cat%C3%A9gorie:Recommandation_de_l%27UIT-T" title="Catégorie:Recommandation de l'UIT-T – French" lang="fr" hreflang="fr" data-title="Catégorie:Recommandation de l'UIT-T" 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/%EB%B6%84%EB%A5%98:ITU-T_%EA%B6%8C%EA%B3%A0" title="분류:ITU-T 권고 – Korean" lang="ko" hreflang="ko" data-title="분류:ITU-T 권고" 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/Categoria:Raccomandazioni_ITU-T" title="Categoria:Raccomandazioni ITU-T – Italian" lang="it" hreflang="it" data-title="Categoria:Raccomandazioni ITU-T" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%98%D0%B0:%D0%9F%D1%80%D0%B5%D0%BF%D0%BE%D1%80%D0%B0%D0%BA%D0%B8_%D0%BD%D0%B0_ITU-T" title="Категорија:Препораки на ITU-T – Macedonian" lang="mk" hreflang="mk" data-title="Категорија:Препораки на ITU-T" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Category:ITU-T%E5%8B%A7%E5%91%8A" title="Category:ITU-T勧告 – Japanese" lang="ja" hreflang="ja" data-title="Category:ITU-T勧告" 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-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9A%D0%B0%D1%82%D0%B5%D0%B3%D0%BE%D1%80%D0%B8%D1%8F:%D0%A0%D0%B5%D0%BA%D0%BE%D0%BC%D0%B5%D0%BD%D0%B4%D0%B0%D1%86%D0%B8%D0%B8_ITU-T" title="Категория:Рекомендации ITU-T – Russian" lang="ru" hreflang="ru" data-title="Категория:Рекомендации ITU-T" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/%E0%B8%AB%E0%B8%A1%E0%B8%A7%E0%B8%94%E0%B8%AB%E0%B8%A1%E0%B8%B9%E0%B9%88:%E0%B8%82%E0%B9%89%E0%B8%AD%E0%B9%80%E0%B8%AA%E0%B8%99%E0%B8%AD%E0%B9%81%E0%B8%99%E0%B8%B0%E0%B8%82%E0%B8%AD%E0%B8%87_ITU-T" title="หมวดหมู่:ข้อเสนอแนะของ ITU-T – Thai" lang="th" hreflang="th" data-title="หมวดหมู่:ข้อเสนอแนะของ ITU-T" data-language-autonym="ไทย" 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<div class="vector-body-before-content"> <div class="mw-indicators"> <div id="mw-indicator-mw-helplink" class="mw-indicator"><a href="/wiki/Help:Category" target="_blank" class="mw-helplink"><span class="mw-helplink-icon"></span>Help</a></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p><b>ITU-T Recommendations</b> are the names given to telecommunications and computer protocol specification documents published by the <a href="/wiki/ITU-T" title="ITU-T">Telecommunication Standardization Sector</a> (ITU-T) of the <a href="/wiki/ITU" class="mw-redirect" title="ITU">International Telecommunication Union</a>. </p> <table class="wikitable" border="1"> <tbody><tr> <th>Series </th> <th>Description </th></tr> <tr> <td>A </td> <td>Organization of the work of ITU-T </td></tr> <tr> <td>B </td> <td>Means of expression: definitions, symbols, classification </td></tr> <tr> <td>C </td> <td>General telecommunication statistics </td></tr> <tr> <td>D </td> <td>General tariff principles </td></tr> <tr> <td>E </td> <td>Overall network operation, telephone service, service operation and human factors </td></tr> <tr> <td>F </td> <td>Non-telephone telecommunication services </td></tr> <tr> <td>G </td> <td>Transmission systems and media, digital systems and networks </td></tr> <tr> <td>H </td> <td>Audiovisual and multimedia systems </td></tr> <tr> <td>I </td> <td>Integrated services digital network </td></tr> <tr> <td>J </td> <td>Cable networks and transmission of television, sound programme and other multimedia signals </td></tr> <tr> <td>K </td> <td>Protection against interference </td></tr> <tr> <td>L </td> <td>Construction, installation and protection of cables and other elements of outside plant </td></tr> <tr> <td>M </td> <td>Telecommunication management, including TMN and network maintenance </td></tr> <tr> <td>N </td> <td>Maintenance: international sound programme and television transmission circuits </td></tr> <tr> <td>O </td> <td>Specifications of measuring equipment </td></tr> <tr> <td>P </td> <td>Telephone transmission quality, telephone installations, local line networks </td></tr> <tr> <td>Q </td> <td>Switching and signalling </td></tr> <tr> <td>R </td> <td>Telegraph transmission </td></tr> <tr> <td>S </td> <td>Telegraph services terminal equipment </td></tr> <tr> <td>T </td> <td>Terminals for telematic services </td></tr> <tr> <td>U </td> <td>Telegraph switching </td></tr> <tr> <td>V </td> <td>Data communication over the telephone network </td></tr> <tr> <td>X </td> <td>Data networks, open system communications and security </td></tr> <tr> <td>Y </td> <td>Global information infrastructure, Internet protocol aspects, next-generation networks, Internet of Things and smart cities </td></tr> <tr> <td>Z </td> <td>Languages and general software aspects for telecommunication systems </td></tr></tbody></table> <div style="display:block; margin-top: 1em; padding-right: 2em"><style data-mw-deduplicate="TemplateStyles:r1111373058">.mw-parser-output .toc-top-false-title{font-weight:bold;text-align:center}.mw-parser-output .toc-top .hlist ul{text-align:inherit}@media all and (min-width:720px){.mw-parser-output .toc-top{clear:left}.mw-parser-output .toc-top-left{float:left}.mw-parser-output .toc-top-right{float:right;clear:right}.mw-parser-output .toc-top-center{margin:auto;clear:none}}body.skin-vector-2022 .mw-parser-output .toc-top{padding:7px}body.skin-vector-2022 .mw-parser-output .toc-top #toc-title-text{border-bottom:0;margin-top:0;font-weight:bold;text-align:center}</style><div class="toc plainlinks toc-top toc-top-left" role="navigation" aria-labelledby="toc-title-text-template" id="toc"> <div class="toctitle"><h2 id="Contents" id="toc-title-text">Contents </h2></div> <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 .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output .hlist ol ol,.mw-parser-output .hlist ol ul,.mw-parser-output .hlist ul dl,.mw-parser-output .hlist ul ol,.mw-parser-output .hlist ul ul{display:inline}.mw-parser-output .hlist .mw-empty-li{display:none}.mw-parser-output .hlist dt::after{content:": "}.mw-parser-output .hlist dd::after,.mw-parser-output .hlist li::after{content:" · ";font-weight:bold}.mw-parser-output .hlist dd:last-child::after,.mw-parser-output .hlist dt:last-child::after,.mw-parser-output .hlist li:last-child::after{content:none}.mw-parser-output .hlist dd dd:first-child::before,.mw-parser-output .hlist dd dt:first-child::before,.mw-parser-output .hlist dd li:first-child::before,.mw-parser-output .hlist dt dd:first-child::before,.mw-parser-output .hlist dt dt:first-child::before,.mw-parser-output .hlist dt li:first-child::before,.mw-parser-output .hlist li dd:first-child::before,.mw-parser-output .hlist li dt:first-child::before,.mw-parser-output .hlist li li:first-child::before{content:" (";font-weight:normal}.mw-parser-output .hlist dd dd:last-child::after,.mw-parser-output .hlist dd dt:last-child::after,.mw-parser-output .hlist dd li:last-child::after,.mw-parser-output .hlist dt dd:last-child::after,.mw-parser-output .hlist dt dt:last-child::after,.mw-parser-output .hlist dt li:last-child::after,.mw-parser-output .hlist li dd:last-child::after,.mw-parser-output .hlist li dt:last-child::after,.mw-parser-output .hlist li li:last-child::after{content:")";font-weight:normal}.mw-parser-output .hlist ol{counter-reset:listitem}.mw-parser-output .hlist ol>li{counter-increment:listitem}.mw-parser-output .hlist ol>li::before{content:" "counter(listitem)"\a0 "}.mw-parser-output .hlist dd ol>li:first-child::before,.mw-parser-output .hlist dt ol>li:first-child::before,.mw-parser-output .hlist li ol>li:first-child::before{content:" ("counter(listitem)"\a0 "}</style><div class="hlist"> <ul><li><a class="external text" href="https://en.wikipedia.org/wiki/Category:ITU-T_recommendations">Top</a></li> <li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=0">0–9</a></li> <li><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=A">A</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=B">B</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=C">C</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=D">D</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=E">E</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=F">F</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=G">G</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=H">H</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=I">I</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=J">J</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=K">K</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=L">L</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=M">M</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=N">N</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=O">O</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=P">P</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=Q">Q</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=R">R</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=S">S</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=T">T</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=U">U</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=V">V</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=W">W</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=X">X</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=Y">Y</a> <a class="external text" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&from=Z">Z</a></li></ul> </div></div></div><div style="clear:both;" class=""></div> <p>See also <a href="/wiki/Category:Network_protocols" title="Category:Network protocols">Category:Network protocols</a>. </p>    </div><div class="mw-category-generated" lang="en" dir="ltr"><div id="mw-subcategories"> <h2>Subcategories</h2> <p>This category has the following 11 subcategories, out of 11 total. </p><div lang="en" dir="ltr" class="mw-content-ltr"><div class="mw-category mw-category-columns"><div class="mw-category-group"><h3>*</h3> <ul><li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeBullet"><a class="CategoryTreeToggle" data-ct-title="ITU-T_Recommendations_Series" aria-expanded="false"></a> </span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_Recommendations_Series" title="Category:ITU-T Recommendations Series">ITU-T Recommendations Series</a></bdi> <span title="Contains 10 subcategories, 0 pages, and 0 files" dir="ltr">(10 C)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li></ul></div><div class="mw-category-group"><h3>I</h3> <ul><li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_E_Series_Recommendations" title="Category:ITU-T E Series Recommendations">ITU-T E Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 5 pages, and 0 files" dir="ltr">(5 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_G_Series_Recommendations" title="Category:ITU-T G Series Recommendations">ITU-T G Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 52 pages, and 0 files" dir="ltr">(52 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeBullet"><a class="CategoryTreeToggle" data-ct-title="ITU-T_H_Series_Recommendations" aria-expanded="false"></a> </span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_H_Series_Recommendations" title="Category:ITU-T H Series Recommendations">ITU-T H Series Recommendations</a></bdi> <span title="Contains 1 subcategory, 14 pages, and 0 files" dir="ltr">(1 C, 14 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_I_Series_Recommendations" title="Category:ITU-T I Series Recommendations">ITU-T I Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 2 pages, and 0 files" dir="ltr">(2 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_P_Series_Recommendations" title="Category:ITU-T P Series Recommendations">ITU-T P Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 3 pages, and 0 files" dir="ltr">(3 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_Q_Series_Recommendations" title="Category:ITU-T Q Series Recommendations">ITU-T Q Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 1 page, and 0 files" dir="ltr">(1 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_T_Series_Recommendations" title="Category:ITU-T T Series Recommendations">ITU-T T Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 38 pages, and 0 files" dir="ltr">(38 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_V_Series_Recommendations" title="Category:ITU-T V Series Recommendations">ITU-T V Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 50 pages, and 0 files" dir="ltr">(50 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeBullet"><a class="CategoryTreeToggle" data-ct-title="ITU-T_X_Series_Recommendations" aria-expanded="false"></a> </span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_X_Series_Recommendations" title="Category:ITU-T X Series Recommendations">ITU-T X Series Recommendations</a></bdi> <span title="Contains 3 subcategories, 19 pages, and 0 files" dir="ltr">(3 C, 19 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li> <li><div class="CategoryTreeSection"><div class="CategoryTreeItem"><span class="CategoryTreeEmptyBullet"></span> <bdi dir="ltr"><a href="/wiki/Category:ITU-T_Y_Series_Recommendations" title="Category:ITU-T Y Series Recommendations">ITU-T Y Series Recommendations</a></bdi> <span title="Contains 0 subcategories, 7 pages, and 0 files" dir="ltr">(7 P)</span></div><div class="CategoryTreeChildren" style="display:none"></div></div></li></ul></div></div></div> </div><div id="mw-pages"> <h2><span class="anchor" id="Pages_in_category"></span>Pages in category "ITU-T recommendations"</h2> <p>The following 179 pages are in this category, out of 179 total. <a href="/wiki/Wikipedia:FAQ/Categorization#Why_might_a_category_list_not_be_up_to_date?" title="Wikipedia:FAQ/Categorization">This list may not reflect recent changes</a>. </p><div lang="en" dir="ltr" class="mw-content-ltr"><div class="mw-category mw-category-columns"><div class="mw-category-group"><h3>0–9</h3> <ul><li><a href="/wiki/10G-PON" title="10G-PON">10G-PON</a></li></ul></div><div class="mw-category-group"><h3>A</h3> <ul><li><a href="/wiki/Accessibility_of_telehealth_services" title="Accessibility of telehealth services">Accessibility of telehealth services</a></li> <li><a href="/wiki/Adaptive_Multi-Rate_Wideband" title="Adaptive Multi-Rate Wideband">Adaptive Multi-Rate Wideband</a></li> <li><a href="/wiki/ADSL" title="ADSL">ADSL</a></li> <li><a href="/wiki/Allowed_cell_rate" title="Allowed cell rate">Allowed cell rate</a></li> <li><a href="/wiki/Asynchronous_Transfer_Mode" title="Asynchronous Transfer Mode">Asynchronous Transfer Mode</a></li> <li><a href="/wiki/ATM_adaptation_layer" title="ATM adaptation layer">ATM adaptation layer</a></li> <li><a href="/wiki/ATM_Adaptation_Layer_2" title="ATM Adaptation Layer 2">ATM Adaptation Layer 2</a></li></ul></div><div class="mw-category-group"><h3>B</h3> <ul><li><a href="/wiki/Broadband_Integrated_Services_Digital_Network" title="Broadband Integrated Services Digital Network">Broadband Integrated Services Digital Network</a></li></ul></div><div class="mw-category-group"><h3>C</h3> <ul><li><a href="/wiki/CHILL" title="CHILL">CHILL</a></li> <li><a href="/wiki/Client_to_Authenticator_Protocol" title="Client to Authenticator Protocol">Client to Authenticator Protocol</a></li> <li><a href="/wiki/Coding_tree_unit" title="Coding tree unit">Coding tree unit</a></li> <li><a href="/wiki/Common_Management_Information_Protocol" title="Common Management Information Protocol">Common Management Information Protocol</a></li> <li><a href="/wiki/Connectionless-mode_Network_Service" title="Connectionless-mode Network Service">Connectionless-mode Network Service</a></li></ul></div><div class="mw-category-group"><h3>D</h3> <ul><li><a href="/wiki/DOCSIS" title="DOCSIS">DOCSIS</a></li></ul></div><div class="mw-category-group"><h3>E</h3> <ul><li><a href="/wiki/Element_management_system" title="Element management system">Element management system</a></li> <li><a href="/wiki/Encoding_Control_Notation" title="Encoding Control Notation">Encoding Control Notation</a></li></ul></div><div class="mw-category-group"><h3>F</h3> <ul><li><a href="/wiki/Fax" title="Fax">Fax</a></li> <li><a href="/wiki/Frequency_grid" title="Frequency grid">Frequency grid</a></li> <li><a href="/wiki/FTAM" title="FTAM">FTAM</a></li></ul></div><div class="mw-category-group"><h3>G</h3> <ul><li><a href="/wiki/G.165" title="G.165">G.165</a></li> <li><a href="/wiki/G.651.1" title="G.651.1">G.651.1</a></li> <li><a href="/wiki/G.652" title="G.652">G.652</a></li> <li><a href="/wiki/G.655" title="G.655">G.655</a></li> <li><a href="/wiki/G.657" title="G.657">G.657</a></li> <li><a href="/wiki/G.703" title="G.703">G.703</a></li> <li><a href="/wiki/G.706" title="G.706">G.706</a></li> <li><span class="redirect-in-category"><a href="/wiki/G.707" class="mw-redirect" title="G.707">G.707</a></span></li> <li><a href="/wiki/G.709" title="G.709">G.709</a></li> <li><a href="/wiki/G.711" title="G.711">G.711</a></li> <li><a href="/wiki/G.718" title="G.718">G.718</a></li> <li><a href="/wiki/G.719" title="G.719">G.719</a></li> <li><a href="/wiki/G.722" title="G.722">G.722</a></li> <li><a href="/wiki/G.722.1" title="G.722.1">G.722.1</a></li> <li><span class="redirect-in-category"><a href="/wiki/G.722.2" class="mw-redirect" title="G.722.2">G.722.2</a></span></li> <li><a href="/wiki/G.723" title="G.723">G.723</a></li> <li><a href="/wiki/G.723.1" title="G.723.1">G.723.1</a></li> <li><a href="/wiki/G.726" title="G.726">G.726</a></li> <li><a href="/wiki/G.728" title="G.728">G.728</a></li> <li><a href="/wiki/G.729" title="G.729">G.729</a></li> <li><a href="/wiki/G.729.1" title="G.729.1">G.729.1</a></li> <li><a href="/wiki/G.783" title="G.783">G.783</a></li> <li><a href="/wiki/G.811" title="G.811">G.811</a></li> <li><a href="/wiki/G.983" title="G.983">G.983</a></li> <li><a href="/wiki/G.988" title="G.988">G.988</a></li> <li><span class="redirect-in-category"><a href="/wiki/G.991.2" class="mw-redirect" title="G.991.2">G.991.2</a></span></li> <li><a href="/wiki/G.992.1" title="G.992.1">G.992.1</a></li> <li><a href="/wiki/G.992.2" title="G.992.2">G.992.2</a></li> <li><a href="/wiki/G.992.3" title="G.992.3">G.992.3</a></li> <li><a href="/wiki/G.992.3_Annex_J" title="G.992.3 Annex J">G.992.3 Annex J</a></li> <li><a href="/wiki/G.992.3_Annex_L" title="G.992.3 Annex L">G.992.3 Annex L</a></li> <li><a href="/wiki/G.992.4" title="G.992.4">G.992.4</a></li> <li><a href="/wiki/G.992.5_Annex_M" title="G.992.5 Annex M">G.992.5 Annex M</a></li> <li><span class="redirect-in-category"><a href="/wiki/G.7041" class="mw-redirect" title="G.7041">G.7041</a></span></li> <li><span class="redirect-in-category"><a href="/wiki/G.7042" class="mw-redirect" title="G.7042">G.7042</a></span></li> <li><a href="/wiki/G.8201" title="G.8201">G.8201</a></li> <li><span class="redirect-in-category"><a href="/wiki/G.8262" class="mw-redirect" title="G.8262">G.8262</a></span></li> <li><a href="/wiki/Synchronous_Ethernet" title="Synchronous Ethernet">Synchronous Ethernet</a></li> <li><a href="/wiki/G.9963" title="G.9963">G.9963</a></li> <li><a href="/wiki/G.9970" title="G.9970">G.9970</a></li> <li><a href="/wiki/G.9972" title="G.9972">G.9972</a></li> <li><a href="/wiki/G.fast" title="G.fast">G.fast</a></li> <li><a href="/wiki/G.hn" title="G.hn">G.hn</a></li> <li><a href="/wiki/GeneralizedTime" title="GeneralizedTime">GeneralizedTime</a></li> <li><a href="/wiki/Generic_Framing_Procedure" title="Generic Framing Procedure">Generic Framing Procedure</a></li> <li><a href="/wiki/Global_title" title="Global title">Global title</a></li> <li><a href="/wiki/GPON" title="GPON">GPON</a></li> <li><a href="/wiki/Guidelines_for_the_Definition_of_Managed_Objects" title="Guidelines for the Definition of Managed Objects">Guidelines for the Definition of Managed Objects</a></li></ul></div><div class="mw-category-group"><h3>H</h3> <ul><li><a href="/wiki/H.120" title="H.120">H.120</a></li> <li><a href="/wiki/H.234" title="H.234">H.234</a></li> <li><a href="/wiki/H.235" title="H.235">H.235</a></li> <li><a href="/wiki/H.239" title="H.239">H.239</a></li> <li><a href="/wiki/H.241" title="H.241">H.241</a></li> <li><a href="/wiki/H.245" title="H.245">H.245</a></li> <li><a href="/wiki/H.248" title="H.248">H.248</a></li> <li><a href="/wiki/H.261" title="H.261">H.261</a></li> <li><a href="/wiki/H.262/MPEG-2_Part_2" title="H.262/MPEG-2 Part 2">H.262/MPEG-2 Part 2</a></li> <li><a href="/wiki/H.263" title="H.263">H.263</a></li> <li><a href="/wiki/Advanced_Video_Coding" title="Advanced Video Coding">Advanced Video Coding</a></li> <li><span class="redirect-in-category"><a href="/wiki/H.265" class="mw-redirect" title="H.265">H.265</a></span></li> <li><a href="/wiki/H.320" title="H.320">H.320</a></li> <li><a href="/wiki/H.323" title="H.323">H.323</a></li> <li><a href="/wiki/H.323_Gatekeeper" title="H.323 Gatekeeper">H.323 Gatekeeper</a></li> <li><a href="/wiki/H.324" title="H.324">H.324</a></li> <li><a href="/wiki/H.331" title="H.331">H.331</a></li> <li><a href="/wiki/H.450" title="H.450">H.450</a></li> <li><a href="/wiki/H.870" title="H.870">H.870</a></li> <li><a href="/wiki/High-bit-rate_digital_subscriber_line" title="High-bit-rate digital subscriber line">High-bit-rate digital subscriber line</a></li> <li><a href="/wiki/High_Efficiency_Video_Coding" title="High Efficiency Video Coding">High Efficiency Video Coding</a></li> <li><a href="/wiki/High_Efficiency_Video_Coding_implementations_and_products" title="High Efficiency Video Coding implementations and products">High Efficiency Video Coding implementations and products</a></li> <li><a href="/wiki/High_Efficiency_Video_Coding_tiers_and_levels" title="High Efficiency Video Coding tiers and levels">High Efficiency Video Coding tiers and levels</a></li> <li><a href="/wiki/Higher_Speed_PON" title="Higher Speed PON">Higher Speed PON</a></li></ul></div><div class="mw-category-group"><h3>I</h3> <ul><li><a href="/wiki/I.430" title="I.430">I.430</a></li> <li><a href="/wiki/ISDN" title="ISDN">ISDN</a></li> <li><a href="/wiki/Intelligent_Network" title="Intelligent Network">Intelligent Network</a></li> <li><a href="/wiki/G.992.5" title="G.992.5">G.992.5</a></li> <li><span class="redirect-in-category"><a href="/wiki/ITU_T.51" class="mw-redirect" title="ITU T.51">ITU T.51</a></span></li></ul></div><div class="mw-category-group"><h3>J</h3> <ul><li><a href="/wiki/JPEG" title="JPEG">JPEG</a></li> <li><a href="/wiki/JPEG_2000" title="JPEG 2000">JPEG 2000</a></li> <li><a href="/wiki/JPEG_XL" title="JPEG XL">JPEG XL</a></li> <li><a href="/wiki/JPIP" title="JPIP">JPIP</a></li></ul></div><div class="mw-category-group"><h3>L</h3> <ul><li><a href="/wiki/Link_Capacity_Adjustment_Scheme" title="Link Capacity Adjustment Scheme">Link Capacity Adjustment Scheme</a></li></ul></div><div class="mw-category-group"><h3>M</h3> <ul><li><a href="/wiki/Media_gateway_control_protocol_architecture" title="Media gateway control protocol architecture">Media gateway control protocol architecture</a></li> <li><a href="/wiki/Message_Oriented_Text_Interchange_Systems" title="Message Oriented Text Interchange Systems">Message Oriented Text Interchange Systems</a></li> <li><a href="/wiki/MML_(programming_language)" title="MML (programming language)">MML (programming language)</a></li> <li><a href="/wiki/Modulated_Noise_Reference_Unit" title="Modulated Noise Reference Unit">Modulated Noise Reference Unit</a></li> <li><a href="/wiki/Motion_JPEG_2000" title="Motion JPEG 2000">Motion JPEG 2000</a></li> <li><a href="/wiki/MPEG_program_stream" title="MPEG program stream">MPEG program stream</a></li> <li><a href="/wiki/MPEG_transport_stream" title="MPEG transport stream">MPEG transport stream</a></li> <li><a href="/wiki/MSISDN" title="MSISDN">MSISDN</a></li> <li><a href="/wiki/%CE%9C-law_algorithm" title="Μ-law algorithm">Μ-law algorithm</a></li></ul></div><div class="mw-category-group"><h3>N</h3> <ul><li><a href="/wiki/NG-PON2" title="NG-PON2">NG-PON2</a></li></ul></div><div class="mw-category-group"><h3>O</h3> <ul><li><a href="/wiki/Open_Document_Architecture" title="Open Document Architecture">Open Document Architecture</a></li> <li><a href="/wiki/Optical_transport_network" title="Optical transport network">Optical transport network</a></li> <li><a href="/wiki/OSI_model" title="OSI model">OSI model</a></li></ul></div><div class="mw-category-group"><h3>P</h3> <ul><li><a href="/wiki/Packet_Layer_Protocol" title="Packet Layer Protocol">Packet Layer Protocol</a></li> <li><a href="/wiki/Perceptual_Speech_Quality_Measure" title="Perceptual Speech Quality Measure">Perceptual Speech Quality Measure</a></li> <li><span class="redirect-in-category"><a href="/wiki/PESQ" class="mw-redirect" title="PESQ">PESQ</a></span></li> <li><a href="/wiki/Perceptual_Evaluation_of_Speech_Quality" title="Perceptual Evaluation of Speech Quality">Perceptual Evaluation of Speech Quality</a></li> <li><span class="redirect-in-category"><a href="/wiki/POLQA" class="mw-redirect" title="POLQA">POLQA</a></span></li> <li><a href="/wiki/Perceptual_Objective_Listening_Quality_Analysis" title="Perceptual Objective Listening Quality Analysis">Perceptual Objective Listening Quality Analysis</a></li> <li><a href="/wiki/Private_Network-to-Network_Interface" title="Private Network-to-Network Interface">Private Network-to-Network Interface</a></li> <li><a href="/wiki/Protocol-control_information" title="Protocol-control information">Protocol-control information</a></li> <li><span class="redirect-in-category"><a href="/wiki/PSQM" class="mw-redirect" title="PSQM">PSQM</a></span></li></ul></div><div class="mw-category-group"><h3>Q</h3> <ul><li><a href="/wiki/Q.931" title="Q.931">Q.931</a></li></ul></div><div class="mw-category-group"><h3>R</h3> <ul><li><a href="/wiki/R_interface" title="R interface">R interface</a></li> <li><a href="/wiki/Remote_Operations_Service_Element_protocol" title="Remote Operations Service Element protocol">Remote Operations Service Element protocol</a></li> <li><a href="/wiki/RM-ODP" title="RM-ODP">RM-ODP</a></li></ul></div><div class="mw-category-group"><h3>S</h3> <ul><li><a href="/wiki/S_interface" title="S interface">S interface</a></li> <li><a href="/wiki/Security_service_(telecommunication)" title="Security service (telecommunication)">Security service (telecommunication)</a></li> <li><a href="/wiki/Signaling_System_No._6" title="Signaling System No. 6">Signaling System No. 6</a></li> <li><a href="/wiki/Signalling_Connection_Control_Part" title="Signalling Connection Control Part">Signalling Connection Control Part</a></li> <li><a href="/wiki/Signalling_System_No._7" title="Signalling System No. 7">Signalling System No. 7</a></li> <li><a href="/wiki/Single-pair_high-speed_digital_subscriber_line" title="Single-pair high-speed digital subscriber line">Single-pair high-speed digital subscriber line</a></li> <li><a href="/wiki/Specification_and_Description_Language" title="Specification and Description Language">Specification and Description Language</a></li> <li><a href="/wiki/Symmetric_digital_subscriber_line" title="Symmetric digital subscriber line">Symmetric digital subscriber line</a></li> <li><a href="/wiki/Synchronous_optical_networking" title="Synchronous optical networking">Synchronous optical networking</a></li></ul></div><div class="mw-category-group"><h3>T</h3> <ul><li><a href="/wiki/T.37" title="T.37">T.37</a></li> <li><a href="/wiki/T.38" title="T.38">T.38</a></li> <li><a href="/wiki/Mixed_raster_content" title="Mixed raster content">Mixed raster content</a></li> <li><a href="/wiki/T.50_(standard)" title="T.50 (standard)">T.50 (standard)</a></li> <li><a href="/wiki/T.51/ISO/IEC_6937" title="T.51/ISO/IEC 6937">T.51/ISO/IEC 6937</a></li> <li><a href="/wiki/ITU_T.61" title="ITU T.61">ITU T.61</a></li> <li><a href="/wiki/JBIG" title="JBIG">JBIG</a></li> <li><a href="/wiki/T.120" title="T.120">T.120</a></li> <li><a href="/wiki/T.192" title="T.192">T.192</a></li> <li><a href="/wiki/JPEG_XR" title="JPEG XR">JPEG XR</a></li> <li><a href="/wiki/Telecommunications_Management_Network" title="Telecommunications Management Network">Telecommunications Management Network</a></li> <li><a href="/wiki/Telephone_numbering_plan" title="Telephone numbering plan">Telephone numbering plan</a></li> <li><a href="/wiki/Total_conversation" title="Total conversation">Total conversation</a></li> <li><a href="/wiki/Transaction_Capabilities_Application_Part" title="Transaction Capabilities Application Part">Transaction Capabilities Application Part</a></li> <li><a href="/wiki/TTCN" title="TTCN">TTCN</a></li></ul></div><div class="mw-category-group"><h3>U</h3> <ul><li><a href="/wiki/U_interface" title="U interface">U interface</a></li> <li><a href="/wiki/Up0-interface" title="Up0-interface">Up0-interface</a></li></ul></div><div class="mw-category-group"><h3>V</h3> <ul><li><a href="/wiki/List_of_ITU-T_V-series_recommendations" title="List of ITU-T V-series recommendations">List of ITU-T V-series recommendations</a></li> <li><a href="/wiki/VDSL" title="VDSL">VDSL</a></li> <li><a href="/wiki/Virtual_concatenation" title="Virtual concatenation">Virtual concatenation</a></li> <li><a href="/wiki/Virtual_terminal" title="Virtual terminal">Virtual terminal</a></li></ul></div><div class="mw-category-group"><h3>X</h3> <ul><li><a href="/wiki/X.21" title="X.21">X.21</a></li> <li><a href="/wiki/X.25" title="X.25">X.25</a></li> <li><a href="/wiki/X.28" title="X.28">X.28</a></li> <li><a href="/wiki/X.32" title="X.32">X.32</a></li> <li><a href="/wiki/X.75" title="X.75">X.75</a></li> <li><a href="/wiki/X.121" title="X.121">X.121</a></li> <li><span class="redirect-in-category"><a href="/wiki/X.200" class="mw-redirect" title="X.200">X.200</a></span></li> <li><span class="redirect-in-category"><a href="/wiki/X.208" class="mw-redirect" title="X.208">X.208</a></span></li> <li><a href="/wiki/X.400" title="X.400">X.400</a></li> <li><a href="/wiki/X.445" title="X.445">X.445</a></li> <li><a href="/wiki/X.500" title="X.500">X.500</a></li> <li><a href="/wiki/X.509" title="X.509">X.509</a></li> <li><span class="redirect-in-category"><a href="/wiki/X.680" class="mw-redirect" title="X.680">X.680</a></span></li> <li><a href="/wiki/X.690" title="X.690">X.690</a></li> <li><span class="redirect-in-category"><a href="/wiki/X.800" class="mw-redirect" title="X.800">X.800</a></span></li> <li><span class="redirect-in-category"><a href="/wiki/X.901-904" class="mw-redirect" title="X.901-904">X.901-904</a></span></li> <li><a href="/wiki/X.1035" title="X.1035">X.1035</a></li> <li><a href="/wiki/X.1205" title="X.1205">X.1205</a></li></ul></div><div class="mw-category-group"><h3>Y</h3> <ul><li><a href="/wiki/Y.3173" title="Y.3173">Y.3173</a></li> <li><a href="/wiki/Y.3176" title="Y.3176">Y.3176</a></li> <li><a href="/wiki/Y.3800" title="Y.3800">Y.3800</a></li></ul></div></div></div> </div></div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&oldid=1167600751">https://en.wikipedia.org/w/index.php?title=Category:ITU-T_recommendations&oldid=1167600751</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a 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