Circuit and method of testing for silent faults in a bi-directional optical communication system
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United States of America Patent
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Jul 14, 1998
Grant Date -
N/A
app pub date -
Aug 2, 1996
filing date -
Aug 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In optical communications systems crosstalk can result in what is termed silent failure. In silent failure, a faulty transmitter appears to function correctly because a receiver in communication therewith is receiving a signal induced by crosstalk. The invention overcomes this problem by tapping the received signal and monitoring it external to the receiver in order to ensure adequate signal levels for a received signal. A microcontroller disables the failed circuit and in an embodiment switches the communication functions to a stand-by circuit.
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