Multiplex communications – Wide area network – Packet switching
Patent
1992-07-17
1994-07-12
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
340827, 359110, 371 82, H04L 122
Patent
active
053295200
ABSTRACT:
A digital communications system with fast facility protection is disclosed. The system includes at least one digital cross-connect which is in bidirectional communication with east and west routes of the network via east and west transmit ports and east and west receive ports. The cross-connect broadcasts a facility over both the east and west routes, and receives the return facility over one of the routes. The cross-connect monitors the error status of the received facility for hard error conditions and excessive error rates, by way of a distributed processor in communication with the port. In the event of an error, the cross-connect blind switches the facility to the inactive port 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.
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patent: 5069521 (1991-12-01), Hardwick
patent: 5073774 (1991-12-01), Ikawa
patent: 5115449 (1992-05-01), Lockyer et al.
patent: 5193086 (1993-03-01), Satomi et al.
patent: 5198808 (1993-03-01), Kudo
patent: 5210740 (1993-05-01), Anzai et al.
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Alcatel Network Systems, Inc.
Marcelo Melvin
Olms Douglas W.
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