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标题: [求助]EPON是什么？  [查看完整版帖子] [打印本页]
时间:  2007-4-21 17:36
作者: SP103     标题: [求助]EPON是什么？

请问EPON是什么？
时间:  2007-4-21 18:24
作者: peter1028

<p>网上资料很多,查一下就行了</p><p></p>
时间:  2007-4-21 20:38
作者: 啥都不是

<p>基于以太网的无源光网络</p><p>ON共有 APON BPON EPON GPON。&nbsp; </p>
时间:  2007-4-23 10:30
作者: freeboys

<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;">EPON</span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;">接入系统具有如下特点：<span lang="EN-US"><p></p></span></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><p>&nbsp;</p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">　　</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman"> EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">的优点主要表现在：</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><br/></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">　　</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">(1)</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">相对成本低，维护简单，容易扩展，易于升级。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">结构在传输途中不需电源，没有电子部件，因此容易铺设，基本不用维护，长期运营成本和管理成本的节省很大；</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">系统对局端资源占用很少，模块化程度高，系统初期投入低，扩展容易，投资回报率高；</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">系统是面向未来的技术，大多数</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">系统都是一个多业务平台，对于向全</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">IP</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">网络过渡是一个很好的选择。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><br/></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">　　</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">(2)</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">提供非常高的带宽。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">目前可以提供上下行对称的</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">1.25Gb/s</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">的带宽，并且随着以太技术的发展可以升级到</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">10Gb/s</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><br/></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">　　</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">(3)</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">服务范围大。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">作为一种点到多点网络，以一种扇出的结构来节省</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">CO</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">的资源，服务大量用户。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><br/></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">　　</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">(4)</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">带宽分配灵活，服务有保证。对带宽的分配和保证都有一套完整的体系。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">可以通过</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">DiffServ</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">、</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">Q/WFQ</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">、</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">WRED</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">等来实现对每个用户进行带宽分配，并保证每个用户的</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">QoS</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">无源网络设备十分简单、稳定可靠、寿命长、易于维护、价格极低。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><br/></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">由于传输带宽宽、对业务透明、易于维护和管理、升级便利、成本较低等优点</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><p></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt;"><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: ˎ̥;"><font face="Times New Roman">EPON</font></span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 宋体; mso-ascii-font-family: ˎ̥; mso-hansi-font-family: ˎ̥;">的主要特点包括以下几个方面：成本低、维护简单、容易扩展、易于升级，提供非常高的带宽，服务范围大，带宽分配灵活。</span><span lang="EN-US" style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;"><br/>&Oslash; </span><span style="FONT-SIZE: 7.5pt; COLOR: black; FONT-FAMILY: 新宋体;">局端（<span lang="EN-US">OLT</span>）与用户（<span lang="EN-US">ONU</span>）之间仅有光纤、光分路器等光无源器件，无需租用机房、无需配备电源、无需有源设备维护人员，因此，可有效节省建设和运营维护成本；<span lang="EN-US"><br/><br/>&Oslash; EPON</span>采用以太网的传输格式同时也是用户局域网<span lang="EN-US">/</span>驻地网的主流技术，二者具有天然的融合性，消除了复杂的传输协议转换带来的成本因素；<span lang="EN-US"><br/><br/>&Oslash; </span>采用单纤波分复用技术（下行<span lang="EN-US">1490nm</span>，上行<span lang="EN-US">1310nm</span>），仅需一根主干光纤和一个<span lang="EN-US">OLT</span>，传输距离可达<span lang="EN-US">20</span>公里。在<span lang="EN-US">ONU</span>侧通过光分路器分送给最多<span lang="EN-US">32</span>个用户，因此可大大降低<span lang="EN-US">OLT</span>和主干光纤的成本压力；<span lang="EN-US"><br/><br/>&Oslash; </span>上下行均为千兆速率，下行采用针对不同用户加密广播传输的方式共享带宽，上行利用时分复用（<span lang="EN-US">TDMA</span>）共享带宽。高速宽带，充分满足接入网客户的带宽需求，并可方便灵活的根据用户需求的变化动态分配带宽；<span lang="EN-US"><br/><br/>&Oslash; </span>点对多点的结构，只需增加<span lang="EN-US">ONU</span>数量和少量用户侧光纤即可方便地对系统进行扩容升级，充分保护运营商的投资；<span lang="EN-US"><br/><br/>&Oslash; EPON</span>具有同时传输<span lang="EN-US">TDM</span>、<span lang="EN-US">IP</span>数据和视频广播的能力，其中<span lang="EN-US">TDM</span>和<span lang="EN-US">IP</span>数据采用<span lang="EN-US">IEEE 802.3</span>以太网的格式进行传输，辅以电信级的网管系统，足以保证传输质量。通过扩展第三个波长（通常为<span lang="EN-US">1550nm</span>）即可实现视频业务广播传输。</span><span lang="EN-US" style="FONT-SIZE: 9pt; FONT-FAMILY: 新宋体; mso-bidi-font-weight: bold;"><p></p></span></p><p></p>
时间:  2007-4-23 10:44
作者: SP103

<p>谢谢，指教</p>
时间:  2007-4-23 11:22
作者: 平生不得志

基于以太网E的无源光网络PON



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