Perhaps, I have the solution.
(1) If OPU1 / ODU1 is a tributary of OPU2, OPU3, OPU4, the OPU1 can
be synchronous to STM-16.
In this case, we don't have rate adaptation. The OTN accuracy is
fitted to the SDH accuracy.
(2) If OPU1 / ODU1 is directly mapped in OTU1, the OPU1 is not
synchronous to STM-16, so AMP procedure is used.
Cordialement, Michel
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