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What is the consequence of losing frame synchronisation?

  • A.The sampling rate at the transmitter drifts out of tolerance
  • B.Every channel is decoded into the wrong one
  • C.Only the channel nearest the synchronising slot is affected
  • D.The pulse amplitudes fall below the detection threshold

Answer: B

Losing synchronisation shifts the whole slot count, so every channel's samples are delivered to the wrong destination and the output is unintelligible across the board. The failure is not local to one channel. Amplitudes and the transmitter's rate are unaffected. This all-or-nothing behaviour is characteristic of position-based multiplexing and is why frame alignment recovery is designed to be fast and robust.

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