Channel and data link automatic restoration

Details Channel and data link automatic restoration Channel and data link automatic restoration

1996-09-30

1999-11-23

Hsu, Alpus H.

Multiplex communications

Fault recovery

Bypass an inoperative channel

370524, 379221, H04J 312, H04M 1100

Patent

active

059912634

ABSTRACT:
A communication switching system having a plurality of switch nodes with each of the switch nodes responsive to a failure of a communication link within a group of communication links to switch active calls from channels of the failed communication link to idle channels of other communication links within the group of communication links. If no idle channels are available within the group of communication links when the communication link fails, a predefined time is waited for a channel to become idle or a new communication link to be added to the group of communication links before the active channels are abandoned. Advantageously, the switching of the active calls to idle channels occurs quickly so that only a momentary interruption of the calls occurs. The group of communication links may advantageously be a non-facility access service (NFAS) group having a combination of ISDN BRI and PRI communication links. The calls can be either voice, video, or data calls.

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