| 摘要 |
<p>A digital communications system with fast facility protection is disclosed. The system includes at least one digital cross-connect (2) which is in bidirectional communication with east and west routes (EAST, WEST) of the network via east and west transmit ports (EO, WO) and east and west receive ports (EI, WI). The cross-connect (2) broadcasts a facility over both the east and west routes, and receives the return facility over one of the routes. The cross-connect (2) monitors the error status of the received facility (EI) for hard error conditions and excessive error rates, by way of a distributed processor (16) in communication with the port (EI). In the event of an error, the cross-connect blind switches the facility to the inactive port (WI) by way of a receive-end switch, according to a first embodiment. According to another embodiment, a head-end switch is performed, thus allowing for improved flexibility for port assignment in the cross-connect (2). <IMAGE> <IMAGE></p> |
