DISTRIBUTED SWITCHING IN BIDIRECTIONAL MULTIPLEX SECTION-SWITCHED RING TRANSMISSION SYSTEMS

摘要

Long delays in bidirectional multiplex section-switched self-healing ring transmission systems are avoided by eliminating looping of communications signals when restoring them in response to a failure in the ring and by distribu ting switching of paths to be protected to ring nodes other than those immediately adjacent the failure. This is realized by provisioning each node in the bidirect ional multiplex section-switched ring transmission system with a map of its traffic pa ttern (all active tributaries) and the relative position of each ring node in the ring transmission system, and allowing the ring node, if it has communications traffi c affected by the failure, to bridge and switch to and from the protection path.