Multiplex communications – Wide area network – Packet switching
Patent
1988-12-20
1992-10-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 16, 340827, 371 81, H04J 302
Patent
active
051595958
ABSTRACT:
A transmission system comprises nodes coupled in a ring via two multiplexed transmission paths having opposite transmission directions. The two paths can be time, space, or wavelength division multiplexed. Bidirectional communications between any two nodes are provided in normal operation using both paths around a first, most direct, part of the ring. In the event of a fault affecting such communications, a protection switch is made to maintain bidirectional communications between the two nodes using both paths around a second, remaining, part of the ring. In this manner, each path can simultaneously carry both normal and protection switched signals. In an embodiment of the invention, only the two nodes adjacent a fault need be aware of the fault, each of these nodes effecting a protection switch for signals terminated at the node and effecting a protective loopback for other signals needing protection. The invention enhances the total capacity of the paths for carrying normal and protection switched signals. A network may comprise a plurality of such ring transmission systems intersecting at at least one network node, the network node comprising a node of each ring and a cross connect switch for switching signals therebetween.
REFERENCES:
patent: 4370744 (1983-01-01), Hirano et al.
patent: 4575843 (1986-03-01), David et al.
patent: 4633246 (1986-12-01), Jones et al.
patent: 4704714 (1987-11-01), Tomizawa
patent: 4747097 (1988-05-01), Ohya
patent: 4769807 (1988-09-01), Niwa
patent: 4815069 (1989-03-01), Nakayashiki
Diperna Dino
Ergle Wayne
Flanagan Thomas P. J.
McEachern James A.
Nicholson David J.
Northern Telecom Limited
Olms Douglas W.
Ton Dang T.
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