OTU units can be interconnected using different FEC types, such as: the transmitting end uses AFEC and the receiving end uses FEC.

Question

Options

• ATrue
• BFalse

• A
  26% (9)
• B
  74% (25)

Explanation

Option B (False) is correct because FEC (Forward Error Correction) must be symmetrical between the transmitting and receiving ends of an OTU link - both sides must use the same FEC type. The transmitter encodes the signal using a specific FEC algorithm, and the receiver must use the identical algorithm to decode and correct errors; mixing AFEC at the transmit end with standard FEC at the receive end would make the decoder unable to interpret the overhead structure correctly, resulting in failed error correction or complete signal loss.

Option A is wrong because it treats FEC as a one-sided, independent configuration, when in reality the encoding scheme and the decoding scheme are tightly coupled - they form a matched pair, not interchangeable plug-ins.

Memory tip: Think of FEC like a lock-and-key system - the transmitter "locks" the signal with a specific FEC type, and the receiver must have the exact same key to unlock it. AFEC and standard FEC are different keys; they simply don't fit each other.

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