Fault forwarding in an optical network

Details Fault forwarding in an optical network Fault forwarding in an optical network

2006-09-26

2006-09-26

Phan, Hanh (Department: 2613)

Optical communications

Diagnostic testing

Fault location

C398S003000, C398S005000, C398S023000, C398S024000, C398S177000, C398S010000, C398S017000, C398S033000, C398S038000, C398S034000, C398S059000, C398S079000, C398S083000, C370S222000, C370S224000, C370S242000, C370S226000, C370S227000, C370S228000, C370S225000

Reexamination Certificate

active

07113699

ABSTRACT:
A system and method for forwarding fault information in an optical network is disclosed. Responsive to a fault being detected at a node, the fault information is forwarded to the destination node in the form of a loss-of-signal condition by turning off laser transmitters used to propagate the signal towards its destination. Thus, a node or other network element not capable of generating an alarm signal consistent with an established alarm signaling protocol, such as a SONET alarm indication signal (AIS) or an SDH multiplexer section alarm indication signal MS-AIS, may still forward the fault condition to a downstream element.

REFERENCES:
patent: 6038678 (2000-03-01), Fukushima et al.
patent: 6359713 (2002-03-01), DeCusatis et al.
patent: 6594232 (2003-07-01), Dupont
patent: 2002/0165962 (2002-11-01), Alvarez et al.

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