Linksys WCM300 Cisco Cable Wideband Solution Design and Implementation Guide, - Page 34

Wideband CMTS Redundancy and Resiliency Chapter 2 Cisco Cable Wideband Components Wideband CMTS Redundancy and Resiliency The uBR10012 wideband CMTS and related hardware and software provide redundancy and resiliency to the Cisco Cable Wideband Solution. Reliable, fault-tolerant components and resilient network technologies automatically identify and overcome failures. The following sections describe the wideband CMTS redundancy and resiliency features: • PRE2 Redundancy and Resiliency, page 2-19 • uBR10-MC5X20 Line Card Redundancy, page 2-19 • Wideband SPA Redundancy and Resiliency, page 2-20 • Edge QAM Redundancy, page 2-21 Table 2-6 summarizes redundancy and resiliency support for the Cisco uBR10012 base system's recommended hardware configuration (see Table 2-1). If component failure occurs, the components listed in Table 2-6 can be replaced without interrupting system operations when redundant components are correctly installed and configured. Table 2-6 Cisco uBR 10012 Base System Redundancy and Resiliency Modular CMTS Component Redundancy and Resiliency Summary PRE2 route processors Two PRE2 modules. The Route Processor Redundancy Plus feature and DOCSIS Stateful Switchover provide the PRE2 modules with fast route processor failover without DOCSIS line card reboot. Redundant power supplies Two DC or AC power entry modules (PEMs). If one PEM fails, the other PEM immediately begins providing the required power to the system. Redundant Timing, Communication, and Control Plus (TCC+) cards The two TCC+ cards monitor each other's priority information so that if the active card fails, the active card role is transferred to the redundant backup card without loss of data. Fan assembly module The fan assembly has four internal fans. If a single fan fails and the fan assembly is still able to cool the chassis, the router will continue to function until the fan assembly module can be replaced. Redundant Half-Height Gigabit Ethernet (HHGE) Multiple HHGE line cards to support connectivity line cards to multiple destinations and to provide network layer redundancy. uBR10-MC5X20S/U/H and uBR10-MC5X20U-D cable interface line cards N+1 Redundancy provides automatic switchover and recovery for cable modems connected as DOCSIS 1.X/2.0 modems in the event that there is a cable interface line card failure. Refer to the Cisco uBR10012 Universal Broadband Router Hardware Installation Guide for complete information on the uBR10012 router's hardware redundancy. 2-18 Cisco Cable Wideband Solution Design and Implementation Guide, Release 1.0 OL-10705-02