Circuit and method of testing for silent faults in a bi-directio

Details Circuit and method of testing for silent faults in a bi-directio Circuit and method of testing for silent faults in a bi-directio

1996-08-02

1998-07-14

Pascal, Leslie

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359110, 359153, H04B 1012

Patent

active

057813183

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.

REFERENCES:
patent: 4399563 (1983-08-01), Greenberg
patent: 4825113 (1989-04-01), Sato et al.
patent: 4994675 (1991-02-01), Levin et al.
patent: 5510917 (1996-04-01), Corke et al.
patent: 5539564 (1996-07-01), Kumozaki et al.

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