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class="pcb"> <div class="t_fsz"> <table cellspacing="0" cellpadding="0"><tr><td class="t_f" id="postmessage_941910"> 烽火：10G EPON产业基本成熟 推动FTTB/C/N网络提速<br /> <br /> <br /> 随着三网融合及国家宽带战略的确立，在运营商全业务运营竞争的驱动下，中国FTTx发展正处于快速转型阶段，电信运营商逐步开始加大FTTH建设规模，2011年中国电信更是在新建区域停止FTTB建设，全面采用FTTH模式建网。但截至2010年全国FTTx建设量已达<br /> <br /> 5500余万线，并将保持持续快速增长态势。<br /> 在FTTx发展前期及中期，为了降低建网成本和改造难度，运营商普遍采用FTTB/C/N的部署方式，单个ONU覆盖几十个甚至上百个用户，每个PON口覆盖用户数可达256户甚至更高。按照中国电信“2013年对南方城市（含县城）的所有家庭客户均可提供20Mbit/s接入，光纤入户（FTTH，即接入带宽达到100Mbit/s以上）覆盖达到8000万户”的规划，当前的建设模式在带宽上将很难实现这一目标。经过这几年FTTx的建设和发展，PON设备和OSP的技术进一步成熟、市场存量逐渐放大，成本也逐渐降低，已经具备进行FTTH规模建设的条件，电信运营商已经不再把FTTB/C/N建设作为新建场景首选模式，FTTB存在一定的局限性，带来一系列网络运维及管理问题，在这种情况下FTTH成为主选建设模式。对于FTTH接入方式，通过合理规划，可以大幅降低综合建设成本，规避投资风险，提高投资回报率。<br /> 10G EPON已步入规模商用期<br /> 在新建场景采用FTTH模式建网的同时，对于城市改造场景和农村宽带接入场景仍然将以FTTB+DSL技术为主，城市地区已建成的FTTB+LAN和FTTC+DSL网络也超过5000万线，对于这些用户每PON口接入宽带端口数量在256~512线之间，可提供的带宽只能达到4 ~8Mbit/s，无法满足未来3~5年20Mbit/s带宽的要求。因此，对于此类现网用户必须考虑带宽升级。<br /> 作为下一代PON的主要成员，10G EPON不仅完全满足技术特点及业务需求，而且在标准完善、产业链、系统设备、<a href="http://opticaltest.oecr.com" target="_blank" class="relatedlink">测试</a>及现网试用等各个方面均处于优势，具备了商用条件。<br /> 从技术标准看，2009年9月，10G EPON标准正式颁布。在标准颁布后，IEEE迅速成立了P1904.1(SIEPON)工作组，致力于制定10G EPON系统层面的互联互通标准。根据计划，该标准已于2010年10月完成标准初稿，在2011年8月将确定标准的最终稿。<br /> 从产业链看，10G EPON的产业链已经相对成熟。PON芯片方面：已有包括PMC、Teknovus、Opulan、Cortina、Freescale、Marvell等多个芯片厂家推出了FPGA方案并得到应用，其中Opulan和Teknovus还推出了ASIC方案，预计今年三季度还有更多厂商推出该方案。光模块方面：海信、SourcePhotonics、Superxon、WTD 等多个光模块厂商均已发布10G EPON对称/非对称光模块，其中海信、Superxon提供的10G对称/非对称方案 OLT和ONU的光模块已经成熟商用。预计从今年第四季度至明年上半年，随着需求数量增加，各厂家将开始大批量生产，价格会显著下降。系统设备方面，国内主流PON设备供应商烽火、中兴、华为在2009年底就已采用FPGA方案进行系统设备开发，目前烽火<a href="http://ofc.oecr.com" target="_blank" class="relatedlink">通信</a>等厂家已推出基于ASIC芯片的10G EPON商用系统，其系统成熟性在2011年4月的中国电信10G EPON互联互通测试中得到了验证。<br /> 从网络兼容性看，10G EPON在标准制订中就特别注意和EPON的前向兼容，在光功率预算上充分考虑了沿用已部署的ODN网络，无需重新铺设ODN网络，在波长使用上采用时分复用的方式与现有EPON共存，另外还专门定义了10G/1G和10G/10G两种速率模式，便于用户从EPON逐步向10G EPON演进。国内主流EPON设备厂家（如烽火、中兴等）现有的OLT设备均能够支持EPON线卡和10G EPON线卡的混插，10G EPON的OLT能够直接与EPON ONU互通，因此运营商要实现EPON向10G EPON的平滑演进，可以顺利采用分步升级方式实现。<br /> 从实际测试看，国内外运营商对10G EPON技术持续密切关注。目前，中国电信已完成多轮10G EPON芯片级互通测试和系统功能验证；中国联通和中国移动也都进行了10G EPON系统测试。总体而言，各运营商对测试结果均较为满意。除了测试，各运营商还进行了10G EPON的小规模试商用，目前国内已经开通数十个10G EPON试点工程。<br /> 结合以上各个环节的分析情况来看，10G EPON已然步入规模商用时期，可以大胆预测，10G EPON将成为未来数年内主要采用的光纤接入技术，是推进网络提速的最佳保证。<br /> 烽火10G EPON方案的特色<br /> 作为国内领先的FTTx整体解决方案提供商，烽火通信一直积极致力下一代PON技术研究，在10G EPON的技术开发和应用方面多次取得重大突破。<br /> 2009年，烽火在业界率先推出支持对称和非对称10G EPON系统，并相继通过了中国电信、中国联通和中国移动集团公司的权威测试，表现优异，是国内首个实现了10G对称速率下1∶256最大光分路比的厂商。<br /> 烽火面向下一代PON技术推出的新一代FTTx接入平台全面支持多种速率模式，并同时支持EPON/GPON/10G EPON/WDM PON混插模式。在该平台基础下，烽火更是紧密结合电信运营商需求，提供现网EPON到10G EPON的完备升级方案：OLT端仅需更换业务板卡，ONU端则可根据用户需求带宽不同选择保留原1G ONU或是将其更换为10G ONU；线路部分更是完全兼容，整个ODN网络可不做改变。提供适合各种不同高带宽业务、高密度用户接入应用场景，且整体施工便捷、开通效率高、投资成本低，并采用统一平台管理，最大限度保护运营商投资，降低网络建设及运营成本。<br /> 作为下一代接入的主流技术，10G EPON从标准、产业链、系统设备、成本等各方面已经基本达到规模应用的条件。10G EPON将凭借其更高的传输速率、更高的分路比、更强的组网能力以及更好的兼容性为三网融合以及宽带提速注入强劲动力。特别是考虑到目前城市新建宽带将逐步以FTTH为主，农村仍将以FTTN+DSL为主的建设模式，对城市接近1亿的FTTB/C用户和农村FTTN用户的宽带速率可以考虑采用10G EPON改造进行提速。因此，10G EPON在中国将会大有可为。烽火，作为业界领先的10G EPON解决方案提供商，将尽其所能与运营商展开多方位积极合作，协助运营商实现FTTx的大提速。 （来源：中国光电网）<br /> <br /> <font size="2"><font color="gray"> <img id="aimg_uRzhS" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" file="http://bbs.oecr.com/xwb/images/bgimg/icon_logo.png" onmouseover="img_onmouseoverfunc(this)" lazyloadthumb="1" border="0" alt="" /> 该贴已经同步到 <a href="http://ome.ac.cn/index.php?m=show&id=3371781370911179" target="_blank">赵艾翟的微博</a></font></font></td></tr></table> <div class="ptg mbm mtn"> <a title="成熟" href="misc.php?mod=tag&id=2304" target="_blank">成熟</a>, <a title="网络" href="misc.php?mod=tag&id=479" target="_blank">网络</a>, <a title="中国电信" href="misc.php?mod=tag&id=545" target="_blank">中国电信</a>, <a title="三网融合" href="misc.php?mod=tag&id=643" target="_blank">三网融合</a>, <a title="运营商" href="misc.php?mod=tag&id=2294" 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