H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/12 (2006.01) H04J 3/08 (2006.01) H04L 12/42 (2006.01) H04L 12/46 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 2094541
Communications circuit connectivity in a bidirectional line-switched ring transmission system is continued in the presence of the failure of a first ring node for communications circuits terminated in the ring node which are redirectable to an alternate (dual hubbing) ring node. The communications circuits are redirected by establishing a bidirectional communications circuit to the alternate ring node. In one example, redirection of the communications circuits is further realized by not squelching communications circuits terminated in the failed ring node in a ring node adjacent the failed ring node on one prescribed side which normally would have been squelched, while squelching communications circuits terminated in the failed ring node in a ring node adjacent to the other side of the failed ring node. This allows the redirectable communications circuits to be loop back switched so that they may be redirected to the alternate ring node. Then, the alternate ring node directly intercepts the redirected communications circuits. This is realized by providing provisioning information to the ring nodes which includes the identity of all communications circuits active in the ring and whether there is an alternate ring node to which any of the communications circuits may be redirected.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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