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What condition is NOT a valid criterion for initiating a BLSR protection switch?

What condition is NOT a valid criterion for initiating a BLSR protection switch?

PrepAway - Latest Free Exam Questions & Answers

A.
Reception of an AIS (all 1 ‘s) signal

B.
High path bit-error-rate (BER) indicated in the B3 byte

C.
Loss-oF. frame (LOF) alarm

D.
Request for a line switch in the K1 byte


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