Survivable network using reverse protection ring

Details Survivable network using reverse protection ring Survivable network using reverse protection ring

1989-08-11

1991-03-26

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 13, 370 8515, 370 16, 34082501, 34082505, 371 82, H04L 100, H04J 314

Patent

active

050035312

ABSTRACT:
In a data communications network comprising a series of nodes connected by optical fiber links providing direct bidirectional communication between adjacent nodes, and communication between non-adjacent nodes in both directions through the same set of intermediate nodes, failure of a single link or of a single node is overcome by protection switching to a standby transmisison loop, including a standby link connecting the head end and tail end nodes of the series. The network provides survivability while also taking advantage of the ability of add/drop multiplexers to allow reuse of bandwidth. Rapid switchover to the protection loop is achieved by providing each node with the capability of detecting and responding to adjacent faults and, in normal operation, maintaining a high-speed by-pass path for the protection loop through all of the nodes except the head end node.

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Wayne Ergle, "Survivable Network Systems", Northern Telecom One Ravinia Dr.--Suite 500, Atlanta, Ga. 30346, pp. 8.2.1-8.2.18.
Paul Langmeyer, "Fiber Optic Network Diversity", NEC America, Inc., Herndon, Va. 22071, pp. 8.3.1 to 8.3.19.

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