The following processes are the responsibility of
the optical multiplex section (OMS) trail termination, I.E the
processes initiate at the point of trail termination:
•validation of connectivity
integrity
•assessment of transmission
quality
•transmission defect detection and
indication
As was the case with the optical channel,
the optical multiplex section (OMS) consists of a pair
of bidirectional but co-located optical channel termination source
and sinks functions.
•Optical multiplex
section termination source: accepts the adapted information from a
client layer network at its input inserts the OMS overhead and
presents the characteristic information of the OMS layer network at
its output.
•Optical multiplex
section termination sink: accepts the characteristic information of
the OMS layer network at its input extracts the OMS overhead and
presents the adapted information at its output.
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