Multiplex communications – Wide area network – Packet switching
Patent
1992-07-17
1995-12-26
Beausoliel, Jr., Robert W.
Multiplex communications
Wide area network
Packet switching
370 16, 34082501, G06F 1134
Patent
active
054796083
ABSTRACT:
A telecommunications system having 1:n group facility protection is disclosed. Two cross-connects are provided, each organized in a distributed fashion, and which have a group of member ports bidirectionally coupled to one another in corresponding fashion via a plurality of paths, such as of the DS-3 data frame type. Each of the cross-connects also include a bidirectional protection port, coupled to the protection port of the other cross-connect by way of a protection path, also preferably of the DS-3 type; the protection port for each cross-connect is assigned to the member port group, and is implemented to be managed by the same distributed interface processing unit as the protected member port group. The cross-connects monitor their member input ports for received facility errors, such as signal failures or excessive failure rates, and request a third-stage bridge from its mate cross-connect in the event of such error. Upon receipt of a good signal at the protection input port, the requesting cross-connect effects a first stage switch, so that the previously failing facility is received over the protection path. Communication of request and acknowledge signals over the protection path is preferably by way of the C-bit and X-bit channels, for DS-3 paths. The switch preferably reverts to the normal condition responsive to the facility becoming valid for a timeout period at the original member port.
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Alcatel Network Systems, Inc.
Beausoliel, Jr. Robert W.
De'cady Albert
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