Network device and method for detecting a link failure which...

Details Network device and method for detecting a link failure which... Network device and method for detecting a link failure which...

2006-03-28

2006-03-28

Chin, Stephen (Department: 2634)

Pulse or digital communications

Testing

C375S340000, C370S228000, C370S443000, C370S462000, C710S107000, C710S305000, C710S120000

Reexamination Certificate

active

07020191

ABSTRACT:
A network device monitors a signal transmitted to a wireless or optical link and a signal received from the link for detecting a bit-by-bit coincidence between them. In response to the detection of the coincidence, the network device determines that the received signal is a copy of the transmitted signal. The network device further monitors its transition states for detecting a predetermined state which would persist indefinitely during a link failure. When the predetermined state and the copy of the transmitted signal are simultaneously detected, the network device discontinues its predetermined state and enters a normal state.

REFERENCES:
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patent: 5859985 (1999-01-01), Gormley et al.
patent: 6038234 (2000-03-01), LaFollette et al.
patent: 2004/0165525 (2004-08-01), Burak
patent: 2004/0255338 (2004-12-01), Agnoli et al.
patent: 0 969 628 (2000-01-01), None

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