Method and device for detecting the loss-of-signal condition at the input of a transmission line interface

Abstract

A method of detecting the loss-of-signal condition at the input of a transmission line interface when the input signal is coded. The input signal decoding includes an additional procedure allowing the detection of loss-of-signal condition. Since the pseudo-random sequence of the input signal transitions includes sequences of code violations, the additional procedure, over a certain threshold error rate, corresponding to a number of code violations in a unit of time, detects the loss-of-signal condition.

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