Fault management in a multichannel transmission system

Patent 6256293 Issued on July 3, 2001. Estimated Expiration Date:

March 16, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Tellabs Operations, Inc.

Application

No. 039665 filed on 03/16/1998

US Classes:

370/228, Spare channel370/216FAULT RECOVERY

Examiners

Primary: Olms, Douglas W.
Assistant: Pizarro, Ricardo M.

Attorney, Agent or Firm

McAndrews, Held & Malloy, Ltd.

Foreign Patent References

3633057 A1 DE. 03/21/1988
0 437 198 A1 EP. 01/21/1991

International Class

G01R 031/08

Abstract

Efficient methods for rerouting failed channels on to spare channels in a multichannel transmission system are described. One method uses a minimal amount of rerouting to reroute all the channels if one or two line cards fail.Another set of methods reroute up to two failed channels on to spare channels in the event of channel failures. With this method only the failed channels are rerouted. However the failed channels may have to be routed through a slightly larger, but minimal, number of additional hops than with the first method.