White Paper Abstract:
The Cisco® MWR 1941-DC-A Mobile Wireless Edge Router can be used either in a redundant configuration or as a standalone device. For redundancy, the Cisco MWR 1941 uses the existing Hot Standby Router Protocol (HSRP) feature and provides 1:1 redundancy for the cell site router. The 1:1 redundancy solution requires an active Cisco MWR 1941 to be deployed with a second Cisco MWR 1941 that is connected to the same network but in standby mode. (See Figure 1, and refer to the "HSRP Operation" section for more information.) Custom Y-cable is used for connecting T1/E1 ports on two separate routers to a single T1/E1 line. Protection switching relays on the T1/E1 ports enable the routers to be deployed 1:1 with Y-cables. LEDs differentiate the active and standby routers. Custom health check software interfacing with HSRP is also used to monitor the redundancy status of the router pair.