Cisco城域接入网络解决方案Cablemodem-Net130Com.PPT

Cisco城域接入网络解决方案---Cable Agenda Cisco CATV Solution Product Update The Cisco Advantage Cable系统 体系结构部件 头端 中继电缆 邻域中的分布电缆 分接电缆 终端设备(电视、电缆调制解调器、机顶盒等) 电缆系统拓扑 (光纤节点) 树和枝杈系统 激活一个双向网络 Hub示意图 有线电视网(HFC)的接入 有线电视网(HFC)的接入 有线电视网(HFC)的接入 Sample Cable Plant Layout Cable Channel Data Rates 目前使用DOCSIS CASE CASE 设计参数 城市的家庭总数= 120,000 城市中的CATV用户(68%) = 81,600 节点 = 城市中的光纤节点总数 = 120 每节点通过的家庭 = 1000 每节点(68% )服务的平均家庭数 = 680 注，有些信息没用 CASE 带宽特征 DS 信道带宽= 6 MHz DSDR = DS QAM-64 数据速率= 27 Mbps US (上行)信道带宽 = 1.6 MHz USDR = US QPSK 数据速率= 2 Mbps 设计预期 所有用户都将在Web上冲浪 预期渗透(10%) = 12,000 每节点的预期用户= 100 每节点用户数= 每节点最大有效用户数(25%) = 25 DSAT = 每有效用户的最大DS有效时间 = 25% USAT =每有效用户的最大US有效时间 = 25% MDSDR = 每用户的最低DS数据速率= 270 Kbps MUSDR =每用户的最低US数据速率= 40 Kbps CASE 设计计算 可能用户/DS = DSDR/(DSAT * MDSDR) = 400 可能用户/US = USDR/(USAT * MUSDR) = 200 可能用户/DS (使用1x4 LC) = 200 x 4 = 800 限制在该例中为DS数据速率 有效用户/DS = 400 节点/DS = (用户/DS)/(用户/节点) = 400/25 = 16 所需DS通道 = 节点/(节点/DS) = 120/16 = 大约8 所需的uBR 7246机箱，带有8个1x4 LC = 8/4 = 2 Cisco Subscriber Registration Center (CSRC) A subscriber and CPE auto-provisioning system: Enables subscriber self-registration and activation Enables mass deployment of broadband services CSRC Components CSRC in the Network CSRC in the Business The Subscriber Experience Agenda Cisco CATV Solution Product Update The Cisco Advantage Cisco CMTS Products uBR10000 SeriesA new Class of CMTS Cost: Virtually unlimited future scalability Passive point-to-point midplane Unique routing technology, optimized for real-world services Plans in place to overcome ALL potential bottlenecks Revenue: Optimized for aggregation Increases Intelligence at edge of network Maximizes useful capacity where needed Supports future access and backbone evolution (DOCSIS, E-DOCSIS, DVB, wireless, MPEG, optical, distributed CMTS, etc) uBR10012 - Components uBR10012 - System Features System Cards Full card level redundancy with hot swap Specialized card types for optimal density performance System Interco