In the electrical layer overhead processing-sink function, when the signal flow is from OCh to Client, first detect PMODUkP; then detect TCM ODUKT.

Question

Options

• ATrue
• BFalse

• A
  21% (9)
• B
  79% (33)

Explanation

Option B (False) is correct because in the electrical layer overhead processing-sink function, when signal flow is from OCh to Client, the correct order is the reverse of what the statement claims: TCM ODUkT is detected first, followed by PM ODUkP. The sink function processes overhead from the outermost network layer inward toward the client, meaning tandem connection monitoring (TCM) is encountered before path monitoring (PM).

Option A is wrong because it accepts an inverted processing sequence. The statement describes the source direction logic (Client → OCh), not the sink direction - in source processing, PM overhead is added to the ODUk before TCM is wrapped around it, so reversing that for sink yields TCM first, then PM.

Memory tip: Think of OTN overhead like nested envelopes. At the source, the PM "inner envelope" is sealed first, then the TCM "outer envelope" wraps it. At the sink (unwrapping/receiving end), you always open the outer envelope (TCM) before the inner one (PM). Source adds inside-out; sink reads outside-in.

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