For the OTN interface without optical layer overhead, in order to achieve the purpose of monitoring, the OTUk/OTUk-v/OTUkV and OTUCn signals are terminated when the interface signals are connected.

Question

Options

• ATrue
• BFalse

• A
  84% (32)
• B
  16% (6)

Explanation

Option A is correct because in OTN architectures that lack optical layer overhead (e.g., "black link" interfaces where the physical optical section carries no OTN management bytes), monitoring capability must still be preserved. The ITU-T G.709 standard addresses this by requiring that OTUk, OTUk-v, OTUkV, and OTUCn signals be terminated at the interface connection point, allowing the overhead embedded within those OTU frames (such as SM/PM/TCM bytes) to be extracted and used for fault management and performance monitoring.

Option B is wrong because omitting OTU termination in this scenario would leave the network with no monitoring visibility - a violation of OTN's operational requirements. The whole point of terminating the OTU signal at the interface is to compensate for the missing optical layer overhead.

Memory tip: Think of it as a "handoff rule" - when the optical layer can't carry its own overhead, the OTU layer steps in and hands off monitoring responsibility by being terminated (processed) at the boundary. No optical overhead → terminate at OTU.

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