System and method for auto-squelching digital communications

Details System and method for auto-squelching digital communications System and method for auto-squelching digital communications

2006-06-29

2011-11-08

Kim, Kevin (Department: 2611)

Pulse or digital communications

Synchronizers

Synchronization failure prevention

Reexamination Certificate

active

08054929

ABSTRACT:
A system and method are provided for auto-squelching digital communications. The method receives digital information from a source node. If the receive channel is corrupted, an alarm condition is detected that is associated with the received digital information. The method transmits an alarm-condition signal to a destination node, and in response to transmitting the alarm-condition signal, maintains a valid link to the destination node. For example, detecting the alarm condition may include: comparing a frequency associated with the recovered clock signal, with a reference frequency; and, detecting a variance between the recovered clock signal frequency and the reference frequency. Alternately, loss of signal, loss of lock, out of band, and run length alarm conditions may be detected. The alarm-condition signal that is transmitted may be a serial data stream of information such as all “0”s data, all “1”s data, or alternating “0”s and “1”s data for example.

REFERENCES:
patent: 7805294 (2010-09-01), Taniguchi
patent: WO2006/033428 (2006-03-01), None

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