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1、,Cisco城域接入网络解决方案-Cable,Agenda,Cisco CATV Solution Product Update The Cisco Advantage,Cable系统,电缆系统拓扑 (光纤节点),从/到头端,级联中一般不到5个放大器,一个节点一般支持200-2000个家庭,树和枝杈系统,头端,光纤节点,中继电缆,激活一个双向网络,RHE(地区头端),其他来源,Modulatorand Scrambler,For EachChannel,Fiber RackTX /RX,本地头端,HFC,LHE,LHE,光纤,LC,UpConverter,uBR 7246,光纤节点,电缆调制解
2、调器,Tap,TV,Receiver,Modulatorand Scrambler,Receiver,Hub示意图,Fast Ether/Gig-Ether,Modulators AM and Digital Channels,Universal Broadband Router,RF,RF,MCNS Down,MCNS Up,OC-48 SONET/SDH/.,Upconverter，射频调制,H,L,混频器,有线电视网(HFC)的接入,模拟电话,UBR7246 Cable Router,HFC,数据网,Cable Modem UBR924/ Small Cable router/ 机顶盒,
3、铜轴电缆 5 - 42MHz,铜轴电缆,以太网,PC,TV,TV,下行 27 - 40Mbps /Modem,上行nx ( 2.5 - 5Mbps) /Modem, n=1,2,4,6,uBR7246,Combiner,CH A,CH B,CH C,CH D,Local Feed,Combiner,Each set of homes sees their primary downstream channel,Downstream:,Frequency Converter,有线电视网(HFC)的接入,HFC,uBR7246,Upstream terminate on respective Lin
4、e Card,Upstreams:,有线电视网(HFC)的接入,HFC,Sample Cable Plant Layout,upstream,downstream,future,DOCSIS,OOB DAVIC,Analog TV,Digital TV,0Mhz,750Mhz,42Mhz,Note: the frequencies for analog vs. digital are arbitrary; only must-carry laws dictate channel placement.,Cable Channel, NTSC -USA - 6 MHz -27/36 Mbit/se
5、c PAL -Europe - 8 MHz -36/46 Mbit/sec, 64/256 QAM -RF Modulated digital signal -Quadrature Amplitude,Data Rates,Freq Range MHz,TDMA Carrier,QAM-256 8 b/Sym,QAM-64 6 b/Sym,QAM-16 4 b/Sym,QPSK 2 b/Sym,54-860,54-860,54-860,54-860,5-42,5-42,5-42,5-42,Channel Width MHz,6,8,6,8,1.6,3.2,1.6,3.2,Baud Rate M
6、Sps,5.3605,7.15,5.057,6.74,1.28,2.56,1.28,2.56,Raw Bit Rate Mbps,42.88,57.2,30.34,40.44,5.12,10.24,2.56,5.12,Payload Rate Mbps,38,57,27,36,4.6,9,2.3,4.6,目前使用DOCSIS,Data Over Cable Networks,OSI,Higher Layers,Transport,Network,Data Link,Physical,Applications,TCP or UDP,IP,IEEE 802.2,DOCSIS MAC,HFC,Up
7、Stream TDMA(Mini-Slots),5-65 MHz (QPSK or QAM-16),Down Stream TDMA(MPEG),Band 6 MHz (QAM-64 or QAM-256),DOCSIS Control Messages,CASE,Backbone,Data Center/Headend,VoD Servers,Cisco Catalyst 6000,Cisco GSR 12000,Middleware Server,Cisco Cable Troubleshooter,Cisco Cache Engine,Satellite,Antenna,Cisco IN
8、A Manager,Cisco 6920 RateMux,Cisco Cable Manager,Cisco CSRC,Video,To Billing,To Internet,Local Ad Insertion Servers,Cisco ONS 15454/GSR,Hub,Home,Cisco uBR 7246-VXR,Cisco INA2320,HFC,DOCSIS/EuroDOCSIS + DVB-RC/DAVIC/DVS-167 OpenCable Advanced,Video,Cisco 6920 RateMux,DVB-RC/DAVIC/DVS-167 OpenCable Ba
9、sic,DOCSIS/EuroDOCSIS,STB,PC,CM,TV,PC,Cisco uBR 7246-VXR,Cisco INA2320,HFC,Video,Cisco 6920 RateMux,STB,PC,CM,TV,Cisco uBR 7246-VXR,HFC,Video,Cisco 6920 RateMux,STB,PC,CM,TV,PC,Fiber Optic Ring,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
10、数 = 680 注，有些信息没用,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,CASE,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
11、的最低US数据速率= 40 Kbps,CASE,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,Billing,Trouble Ticket
12、Admin,Cable Management Solution,CSRC,Network Management,LDAP,Cable Manager,RF Trouble- Shooting,CMTS & Modem Fault & Performance Monitoring,Provisioning,Service Mgmt with Cisco Partners,Cable Troubleshooter,DOCSIS CM,904/ 924,uBR 7200,Telnet,SNMP,TFTP DNS DHCP,PCs,Order Entry Mgmt,Cisco Subscriber R
13、egistration Center (CSRC),A subscriber and CPE auto-provisioning system: Enables subscriber self-registration and activation Enables mass deployment of broadband services,CSRC Components,Dialin Server 5x00,Backbone,Self Activation,Cisco 7246 uBR,HFC Cable Plant,DOCSIS CM,Telco Return,Directory,LDAP,
14、Security,Access Registrar v1.3,Directory Client,User and Modem Registrar v1.0,HTTP,Directory Client,Cisco Network Registrar v3.0T,DHCP,TFTP,DNS,DDNSUpdate,Reset viaSNMP,IP Addressand Options,LDAPUpdate,Directory Client,RADIUS,DOCSISConfiguration,Callout Manager,SNMP,CSRC in the Network,Billing Syste
15、m,TOD,Cisco Switch,CSRC in the Business,Cisco Subscriber Registration Center,Billing System, Customer Care, NMS,Directory & Databases,The Subscriber Experience,1. Registration,2. Activation,CSRC,Directory / Database,3. Maintenance,No calls to a CSR,Proactive network surveillance of uBR CMTS and cable modems Cable Modem SW image download Topology tree map of CMTS and Modems Tabular and graphical
