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개방형 시스템 간 상호 접속 - 위키백과, 우리 모두의 백과사전
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[o]" accesskey="o" class=""><span>로그인</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="더 많은 옵션" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="개인 도구" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">개인 도구</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="사용자 메뉴" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_ko.wikipedia.org&uselang=ko"><span>기부</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%ED%8A%B9%EC%88%98:%EA%B3%84%EC%A0%95%EB%A7%8C%EB%93%A4%EA%B8%B0&returnto=%EA%B0%9C%EB%B0%A9%ED%98%95+%EC%8B%9C%EC%8A%A4%ED%85%9C+%EA%B0%84+%EC%83%81%ED%98%B8+%EC%A0%91%EC%86%8D" title="계정을 만들고 로그인하는 것이 좋습니다. 하지만 필수는 아닙니다"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>계정 만들기</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%ED%8A%B9%EC%88%98:%EB%A1%9C%EA%B7%B8%EC%9D%B8&returnto=%EA%B0%9C%EB%B0%A9%ED%98%95+%EC%8B%9C%EC%8A%A4%ED%85%9C+%EA%B0%84+%EC%83%81%ED%98%B8+%EC%A0%91%EC%86%8D" title="위키백과에 로그인하면 여러가지 편리한 기능을 사용할 수 있습니다. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>로그인</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> 로그아웃한 편집자를 위한 문서 <a href="/wiki/%EB%8F%84%EC%9B%80%EB%A7%90:%EC%86%8C%EA%B0%9C" aria-label="편집에 관해 더 알아보기"><span>더 알아보기</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%ED%8A%B9%EC%88%98:%EB%82%B4%EA%B8%B0%EC%97%AC" title="이 IP 주소의 편집 목록 [y]" accesskey="y"><span>기여</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%ED%8A%B9%EC%88%98:%EB%82%B4%EC%82%AC%EC%9A%A9%EC%9E%90%ED%86%A0%EB%A1%A0" title="현재 사용하는 IP 주소에 대한 토론 문서 [n]" accesskey="n"><span>토론</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><!-- CentralNotice --></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="사이트"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="목차" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">목차</h2> <button class="vector-pinnable-header-toggle-button 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보기</span> </div> </a> <ul id="toc-같이_보기-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-추가_문헌" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#추가_문헌"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>추가 문헌</span> </div> </a> <ul id="toc-추가_문헌-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-외부_링크" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#외부_링크"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>외부 링크</span> </div> </a> <ul id="toc-외부_링크-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="목차" 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="목차 토글" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">목차 토글</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">개방형 시스템 간 상호 접속</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="다른 언어로 문서를 방문합니다. 16개 언어로 읽을 수 있습니다" > <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-16" 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">16개 언어</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%A7%D9%84%D8%AA%D8%B1%D8%A7%D8%A8%D8%B7_%D8%A7%D9%84%D8%AD%D8%B1_%D8%A8%D9%8A%D9%86_%D8%A7%D9%84%D8%A3%D9%86%D8%B8%D9%85%D8%A9" title="الترابط الحر بين الأنظمة – 아랍어" lang="ar" hreflang="ar" data-title="الترابط الحر بين الأنظمة" data-language-autonym="العربية" data-language-local-name="아랍어" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-br mw-list-item"><a href="https://br.wikipedia.org/wiki/OSI" title="OSI – 브르타뉴어" lang="br" hreflang="br" data-title="OSI" data-language-autonym="Brezhoneg" data-language-local-name="브르타뉴어" class="interlanguage-link-target"><span>Brezhoneg</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Open_Systems_Interconnection" title="Open Systems Interconnection – 체코어" lang="cs" hreflang="cs" data-title="Open Systems Interconnection" data-language-autonym="Čeština" data-language-local-name="체코어" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%91%CE%BD%CE%BF%CE%B9%CE%BA%CF%84%CE%AE_%CE%94%CE%B9%CE%B1%CF%83%CF%8D%CE%BD%CE%B4%CE%B5%CF%83%CE%B7_%CE%A3%CF%85%CF%83%CF%84%CE%B7%CE%BC%CE%AC%CF%84%CF%89%CE%BD_%E2%80%93_OSI" title="Ανοικτή Διασύνδεση Συστημάτων – OSI – 그리스어" lang="el" hreflang="el" data-title="Ανοικτή Διασύνδεση Συστημάτων – OSI" data-language-autonym="Ελληνικά" data-language-local-name="그리스어" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-en badge-Q70893996 mw-list-item" title=""><a href="https://en.wikipedia.org/wiki/Open_Systems_Interconnection" title="Open Systems Interconnection – 영어" lang="en" hreflang="en" data-title="Open Systems Interconnection" data-language-autonym="English" data-language-local-name="영어" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/Comhcheangal_c%C3%B3rais_oscailte" title="Comhcheangal córais oscailte – 아일랜드어" lang="ga" hreflang="ga" data-title="Comhcheangal córais oscailte" data-language-autonym="Gaeilge" data-language-local-name="아일랜드어" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-is mw-list-item"><a href="https://is.wikipedia.org/wiki/OSI_lagakerfi%C3%B0" title="OSI lagakerfið – 아이슬란드어" lang="is" hreflang="is" data-title="OSI lagakerfið" data-language-autonym="Íslenska" data-language-local-name="아이슬란드어" class="interlanguage-link-target"><span>Íslenska</span></a></li><li class="interlanguage-link interwiki-it badge-Q70893996 mw-list-item" title=""><a href="https://it.wikipedia.org/wiki/Open_Systems_Interconnection" title="Open Systems Interconnection – 이탈리아어" lang="it" hreflang="it" data-title="Open Systems Interconnection" data-language-autonym="Italiano" data-language-local-name="이탈리아어" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E9%96%8B%E6%94%BE%E5%9E%8B%E3%82%B7%E3%82%B9%E3%83%86%E3%83%A0%E9%96%93%E7%9B%B8%E4%BA%92%E6%8E%A5%E7%B6%9A" title="開放型システム間相互接続 – 일본어" lang="ja" hreflang="ja" data-title="開放型システム間相互接続" data-language-autonym="日本語" data-language-local-name="일본어" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/OSI" title="OSI – 쿠르드어" lang="ku" hreflang="ku" data-title="OSI" data-language-autonym="Kurdî" data-language-local-name="쿠르드어" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Open_Systems_Interconnection" title="Open Systems Interconnection – 러시아어" lang="ru" hreflang="ru" data-title="Open Systems Interconnection" data-language-autonym="Русский" data-language-local-name="러시아어" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/OSI" title="OSI – 알바니아어" lang="sq" hreflang="sq" data-title="OSI" data-language-autonym="Shqip" data-language-local-name="알바니아어" class="interlanguage-link-target"><span>Shqip</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Open_Systems_Interconnection" title="Open Systems Interconnection – 스웨덴어" lang="sv" hreflang="sv" data-title="Open Systems Interconnection" data-language-autonym="Svenska" data-language-local-name="스웨덴어" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%A4%E0%AE%BF%E0%AE%B1%E0%AE%A8%E0%AF%8D%E0%AE%A4_%E0%AE%85%E0%AE%AE%E0%AF%88%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81_%E0%AE%87%E0%AE%9F%E0%AF%88%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AE%BF%E0%AE%A3%E0%AF%88%E0%AE%AA%E0%AF%8D%E0%AE%AA%E0%AF%81%E0%AE%AA%E0%AF%8D_%E0%AE%AA%E0%AE%9F%E0%AE%BF%E0%AE%AE%E0%AE%AE%E0%AF%8D" title="திறந்த அமைப்பு இடைப்பிணைப்புப் படிமம் – 타밀어" lang="ta" hreflang="ta" data-title="திறந்த அமைப்பு இடைப்பிணைப்புப் படிமம்" data-language-autonym="தமிழ்" data-language-local-name="타밀어" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A1%D0%B5%D1%80%D0%B5%D0%B4%D0%BE%D0%B2%D0%B8%D1%89%D0%B5_%D0%B7%D0%B2%27%D1%8F%D0%B7%D0%BA%D1%83_%D0%B2%D1%96%D0%B4%D0%BA%D1%80%D0%B8%D1%82%D0%B8%D1%85_%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC" title="Середовище зв'язку відкритих систем – 우크라이나어" lang="uk" hreflang="uk" data-title="Середовище зв'язку 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<b>개방형 시스템 간 상호 접속</b>(Open Systems Interconnection, 줄여서 OSI, 개방형 상호접속시스템)은 <a href="/wiki/%EA%B5%AD%EC%A0%9C_%ED%91%9C%EC%A4%80%ED%99%94_%EA%B8%B0%EA%B5%AC" title="국제 표준화 기구">국제 표준화 기구</a>가 <a href="/wiki/ITU-T" title="ITU-T">ITU-T</a>와 나란히 1977년에 시작한 <a href="/wiki/%EC%BB%B4%ED%93%A8%ED%84%B0_%EB%84%A4%ED%8A%B8%EC%9B%8C%ED%81%AC" class="mw-redirect" title="컴퓨터 네트워크">컴퓨터망</a> 표준을 말한다. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="역사"><span id=".EC.97.AD.EC.82.AC"></span>역사</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%EA%B0%9C%EB%B0%A9%ED%98%95_%EC%8B%9C%EC%8A%A4%ED%85%9C_%EA%B0%84_%EC%83%81%ED%98%B8_%EC%A0%91%EC%86%8D&action=edit&section=1" title="부분 편집: 역사"><span>편집</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>OSI 이전에 네트워킹은 크게 <a href="/wiki/ARPANET" class="mw-redirect" title="ARPANET">ARPANET</a>, <a href="/wiki/CYCLADES" title="CYCLADES">CYCLADES</a>처럼 정부 지원을 받은 쪽이나 <a href="/wiki/SNA" class="mw-disambig" title="SNA">SNA</a>, <a href="/wiki/%EC%95%A0%ED%94%8C%ED%86%A0%ED%81%AC" title="애플토크">애플토크</a>, <a href="/wiki/%EB%84%B7%EC%9B%A8%EC%96%B4" title="넷웨어">넷웨어</a>, <a href="/w/index.php?title=DECnet&action=edit&redlink=1" class="new" title="DECnet (없는 문서)">DECnet</a>과 같은 규약 표준을 이루던 업체 개발 쪽으로 기울어 있었다. OSI는 산업에 종사하는 사람들이 통일된 네트워크 표준에 동의하여 여러 업체끼리의 상호 운용성을 제공하는 데 동의할 수 있도록 한 산업적 노력의 결과였다. OSI가 네트워크 표준을 자체적으로 만든 반면 인터넷 이용 쪽에서는 <a href="/wiki/TCP/IP" class="mw-redirect" title="TCP/IP">TCP/IP</a>가 널리 쓰이게 되었고 근거리 망 수준에서는 <a href="/wiki/%EC%9D%B4%EB%8D%94%EB%84%B7" title="이더넷">이더넷</a>과 <a href="/wiki/%ED%86%A0%ED%81%B0_%EB%A7%81" class="mw-redirect" title="토큰 링">토큰 링</a>이 널리 쓰였다. </p><p><a href="/wiki/OSI_%EB%AA%A8%EB%8D%B8" class="mw-redirect" title="OSI 모델">OSI 참조 모델</a>은 네트워크 개념에 대한 교육에 대한 주된 진전이었다. 이는 네트워크 장치와 소프트웨어 사이의 상호 작용을 정의함으로써 프로토콜 계층의 일정한 모델에 대한 개념을 널리 퍼뜨렸다. </p> <div class="mw-heading mw-heading2"><h2 id="같이_보기"><span id=".EA.B0.99.EC.9D.B4_.EB.B3.B4.EA.B8.B0"></span>같이 보기</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%EA%B0%9C%EB%B0%A9%ED%98%95_%EC%8B%9C%EC%8A%A4%ED%85%9C_%EA%B0%84_%EC%83%81%ED%98%B8_%EC%A0%91%EC%86%8D&action=edit&section=2" title="부분 편집: 같이 보기"><span>편집</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/OSI_%EB%AA%A8%EB%8D%B8" class="mw-redirect" title="OSI 모델">OSI 모델</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="추가_문헌"><span id=".EC.B6.94.EA.B0.80_.EB.AC.B8.ED.97.8C"></span>추가 문헌</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%EA%B0%9C%EB%B0%A9%ED%98%95_%EC%8B%9C%EC%8A%A4%ED%85%9C_%EA%B0%84_%EC%83%81%ED%98%B8_%EC%A0%91%EC%86%8D&action=edit&section=3" title="부분 편집: 추가 문헌"><span>편집</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li>Marshall T. Rose, <i>The Open Book</i> (Prentice-Hall, Englewood Cliffs, 1990)</li> <li>David M. Piscitello, A. Lyman Chapin, <i>Open Systems Networking</i> (Addison-Wesley, Reading, 1993)</li> <li><a href="/w/index.php?title=Andrew_S._Tanenbaum&action=edit&redlink=1" class="new" title="Andrew S. Tanenbaum (없는 문서)">Andrew S. Tanenbaum</a>, Computer Networks, 4th Edition, (Prentice-Hall, 2002) <style data-mw-deduplicate="TemplateStyles:r38117996">.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 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.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><a href="/wiki/%EA%B5%AD%EC%A0%9C_%ED%91%9C%EC%A4%80_%EB%8F%84%EC%84%9C_%EB%B2%88%ED%98%B8" class="mw-redirect" title="국제 표준 도서 번호">ISBN</a> <a href="/wiki/%ED%8A%B9%EC%88%98:%EC%B1%85%EC%B0%BE%EA%B8%B0/0-13-066102-3" title="특수:책찾기/0-13-066102-3">0-13-066102-3</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="외부_링크"><span id=".EC.99.B8.EB.B6.80_.EB.A7.81.ED.81.AC"></span>외부 링크</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%EA%B0%9C%EB%B0%A9%ED%98%95_%EC%8B%9C%EC%8A%A4%ED%85%9C_%EA%B0%84_%EC%83%81%ED%98%B8_%EC%A0%91%EC%86%8D&action=edit&section=4" title="부분 편집: 외부 링크"><span>편집</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=20269">ISO/IEC 7498-1:1994</a>, <i>Information technology—Open Systems Interconnection—Basic Reference Model: The Basic Model</i></li> <li><a rel="nofollow" class="external text" href="http://www.itu.int/rec/T-REC-X.200/en/">ITU-T Recommendation X.200 (11/93) [ISO/IEC 7498-1:1994]</a>, <i>Open Systems Interconnection - Basic Reference Model</i>.</li> <li><a rel="nofollow" class="external text" href="http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/osi_prot.htm">Open System Interconnection Protocols</a></li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r36480591">.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 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