The MOTUm interface completes the ODUPM overhead encapsulation before the ODUK-TCM encapsulation in the sending sea?

Question

Options

• ATrue
• BFalse

• A
  84% (49)
• B
  16% (9)

Explanation

Option A is correct because in the OTN (Optical Transport Network) sending/egress direction at a MOTUm interface, the ODU Path Monitoring (ODUPM) overhead encapsulation is completed before the ODU Tandem Connection Monitoring (ODUK-TCM) overhead is processed. ODUPM covers the full end-to-end ODU path and is established at the outermost monitoring scope, so it must be finalized first in the encapsulation sequence. ODUK-TCM, which monitors sub-path segments (tandem connections) within the network, is then applied in the next stage, following the ITU-T G.709 defined processing order for OTN overhead layers.

Option B is incorrect because it implies TCM encapsulation precedes PM encapsulation in the sending direction, which reverses the defined layer processing sequence - PM (broader scope, outer layer) always precedes TCM (narrower scope, inner sub-path) in egress processing.

Memory tip: "PM before TCM - P comes before T in the alphabet, and Path Monitoring is completed before Tandem Connection Monitoring in the sending direction."

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