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有线电视EoC宽带技术介绍

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有线电视EoC宽带技术介绍有线电视EoC宽带技术介绍 有线电视EOC宽带技术介绍 中国有线电视起步于20世纪80年代后期,经过几十年的建设和发展,目前有线电视网用户数量已达到一亿多,其主要的网络为HFC(Hybrid Fiber Coaxial)光纤同轴电缆混合网,由于电视信号的单向广播方式的传输使得目前广电网还是主要以单向网络形式存在。为降低维护管理成本,应对日益激烈甚至是残酷的竞争:避免用户流失、提升多业务、全业务服务能力,充分利用现有庞大的HFC基础网络来拓展双向传输业务(诸如:宽带、数字电视、视频点播)的开展,已成为广电运营商的...

有线电视EoC宽带技术介绍
有线电视EoC宽带技术介绍 有线电视EOC宽带技术介绍 中国有线电视起步于20世纪80年代后期,经过几十年的建设和发展,目前有线电视网用户数量已达到一亿多,其主要的网络为HFC(Hybrid Fiber Coaxial)光纤同轴电缆混合网,由于电视信号的单向广播方式的传输使得目前广电网还是主要以单向网络形式存在。为降低维护管理成本,应对日益激烈甚至是残酷的竞争:避免用户流失、提升多业务、全业务服务能力,充分利用现有庞大的HFC基础网络来拓展双向传输业务(诸如:宽带、数字电视、视频点播)的开展,已成为广电运营商的当前双向改造的主要课题。 EPON+EoC 首先从广电网络的分前端到单元楼道采用EPON网络结构,而从楼道到用户家这 “最后一百米” 的线路,目前解决方案有很多种,而本方案中推荐用Ethernet over Coax(EoC)的方案,后面会做介绍。 一、EPON EPON(Ethernet passive optical networks,以太无源光网络)是一项采用点到多点拓扑结构、利用光纤和光无源器件进行物理层传输、通过以太网 协议 离婚协议模板下载合伙人协议 下载渠道分销协议免费下载敬业协议下载授课协议下载 提供多种业务的宽带接入新技术。这项技术充分结合了无源光网络技术和以太网技术的优势,为在局端中心机房(CO)和终端客户现场之间配置宽带接入光纤线路提供了一种高效低成本的方法。无源光网络技术因其点到多点的拓扑结构、传输中只需要无源器件的特点,具备节省铺设成本,免后期维护的优点,特别适合于接入网领域,成为备受青睐的光接入网技术。EPON充分结合了无源光网络技术和以太网技术的优势,通过经济高效的结构和技术,为接入网最终用户提供一种最有效的宽带方式。 attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 一个典型的EPON无源光网络系统由光线路终端(OLT:Optical Line Termination)、光网络单元(ONU:Optical Network Unit / ONT:Optical Network Termination)、光分配网络(ODN:Optical Distribution Network)组成(如图1)。光分配网络包括光分路器(Splitter)和光纤,光分路器是无源光纤分支器,是一个连接光线路终端和光网络单元的无源设备,它的功能是分发下行数据并集中上行数据。在下行方向采用802.3帧广播技术(如图2),上行方向执行时分复用相关接入协议(如图3)。由于上行方向上的给定时刻只允许一个用户传输,为了避免不同用户的冲突,采用了多点控制协议(Multi-point control protocol,MPCP)。 此网络具有以下特点: ? 网络采用两级结构,“高性能、低成本” 网络的组建采用了先进的PON两级网络结构,不需要有源汇聚设备,降低了网络投建的成本,同时又因为少一级网络中转设备,提高了网络的整体性能。 attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined ? 光纤线路结构与CATV光网络兼容,无需重新布线 局端设备(OLT)经过光分支器将光信号进行功率分配后送给各终端设备(ONU),这与CATV光网络的光纤线路结构是完全一致,因此可利用现有CATV网络的光纤线路直接承载数据,无需重新布置安装线路,间接节省了数据网络的建设成本。 ? 天然的用户隔离技术,网络安全的保证 本网络的主体采用EPON技术,EPON网络中各个ONU是天然隔离的,它与通过划分VLAN隔离不同,是由底层数据传输协议 规定 关于下班后关闭电源的规定党章中关于入党时间的规定公务员考核规定下载规定办法文件下载宁波关于闷顶的规定 的,更能够保障整个网络的安全。 ? 局端与终端设备均采用光接口,无需外置光/电转换器 局端设备与终端设备均采用光纤接口,直接与光纤网络连接,无需外置光/电转换设备,既减少了日常网络的维护量,又降低了成本。 ? 便于升级,可通过增加光分路器的分光比增加光节点的数量。 最后一百米接入方案:Ethernet Over Coax(EoC)——E-Cable同轴宽带系统 针对CM在实际应用中的诸多不足,产生了一种新的解决方案Ethernet Over Coax 技术——E-Cable同轴宽带系统,它是将以太数据信号IP DATA和有线电视信号TV RF 采用频分复用技术,对同一根铜轴电缆通过频率分割,在10,25MHZ 带宽内直接传送10Base-T的基带以太网DATA信号,50,860MHz 仍然传送RF TV信号,这两个信号在同一根同轴电缆里传输,在楼宇内利用HFC 网络入户的同轴电缆将IP DATA和 TV RF混合信号直接传送至客户端,再在客户端分离出TV RF射频信号连接至电视机或DVB 机顶盒;分离出IP DATA 数据信号连接至计算机。 attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined 此网络具有以下优点: ? 迎合HFC 网络的拓扑结构。 无需对单元楼道内网络进行改造,充分利用HFC 网络的同轴线缆资源。 ? 维护简单,可靠性高。 楼道分支设备和用户端设备和EOPN网络一样也只有无源设备,减少了有源环节,便于维护。 ? 成本低,安装方便,不需要调试。 在用户端不需要modem, 用户可以自行安装。用户不再需要通过低频段反向通路接入核心网络, 减少了侵入噪声带来故障等一系列相关问题。 ? 带宽比CM有更高保证。 attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined E-Cable同轴宽带系统特点: ? 图形管理:采用Windows图形化管理软件实现轻松管理 ? 流量控制:可设置IEEE 802.3x全双工流控 ? 即插即用:支持端口自协商和MDI / MDIX ? VLAN功能:可设置Port-base VLAN和802.1Q VLAN ? 广播风暴抑制:可以设置打开或者关闭抑制功能 ? 流量控制:可设置基于端口的双向带宽控制功能,控制粒度为128K起倍增 ? QoS功能:可设置802.1p、ToS和基于端口优先级控制 ? 组播功能:可设置组播管理,兼容IGMP v1/v2 标准,同时可提供组播跨VLAN功能,不受VLAN隔离限制 ? 超低功耗:无风扇 设计 领导形象设计圆作业设计ao工艺污水处理厂设计附属工程施工组织设计清扫机器人结构设计 ,专业结构设计,整机超低功耗,可以适应恶劣环境 ? 掉电时不影响原广电同轴网络,不影响电视正常收看 ? 传输距离:上联端口100Mbps支持100 米五类线,下联端口10Mbps支持100 米75-5 同轴电缆 attempted as the case of responsible for the accident and construction team injuries accident penalty provisions, mutatis mutandis. Eight, should perform in the construction standards and specifications, serial number a 1 GB3323-2005 steel fusion welded butt joints, welding engineering-Ray lighting and quality rating of 2 GB11345-89 steel welds manual methods of ultrasonic inspection and testing results for grade 3 GB50236-2002 industrial pipe welding engineering code for construction and acceptance of field equipment 4 HGJ222-92 technical specification for welding of aluminium and its alloys 5 low temperature steel welding procedure 6 SH3525-2004 petrochemical JB/ T4708-2000 of welding procedure qualification for steel pressure vessels 7 JB/4709-2000 8 JB4730-2005 pressure vessel welding procedures of steel pressure vessel NDT 9 JB/T4744-2000 steel pressure vessel products mechanical properties test of welded plate II, mechanical equipment installation engineering 1 GB150-98 2 GB50128-2005 vertical cylindrical steel pressure vessel steel welded specification for construction and acceptance of oil tank 3 JB/ T4735-1997 steel welded atmospheric pressure vessel 4 GB50231-2009 mechanical equipment installation engineering construction and acceptance specification for 5 GB50275-98 compressor, fan and pump installation engineering construction and acceptance specification for lifting 6 HG20201-2000 construction installation engineering construction standard 7, HG ... Pressure gauges, using an installed spark arrestor for acetylene cylinders, illegal carrying, using gas cylinders, each operator fined 20 Yuan. Gas bottle without the hot sun exposure measures, responsibilities of team a fine of 50 Yuan. (7) at height and the opening and provisional protective measures have been taken, the responsible unit fined
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