H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/1.9
H04J 14/08 (2006.01) H04J 3/08 (2006.01) H04L 12/437 (2006.01)
Patent
CA 1279132
RING TRANSMISSION SYSTEM Abstract of the Disclosure A transmission system comprises nodes coupled in a ring via two paths having opposite transmission directions. 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. - i -
563316
Flanagan Thomas Patrick Joseph
Mceachern James Angus
Nicholson David John
Nortel Networks Limited
Smith Dallas F.
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