9.2.3 Optical Data Unit (ODU) Analysis
The ODU overhead is divided into several fields: RES, PM, TCMi, TCM ACT, FTFL, EXP, GCC1/GCC2 and APS/PCC.
Reserved (RES)
bytes are undefined and set aside for future applications.
Path Monitoring (PM)
Field is similar to the SM field described above. It contains the TTI, BIP-8, BEI, BDI, and Status (STAT) subfields.
PM TTI Type
TCMi:
There are six Tandem Connection Monitoring (TCMi) fields that define the ODU TCM sub-layer, each containing
TTI, BIP-8, BEI/BIAE, BDI, and STAT subfields associated to each TCM level (i=1 to 6).
The STAT subfield is used in the PM and TCMi fields to provide an indication of the presence or absence of
maintenance signals.
TCM1 BEI Type
RXT-3900 e-Manual D07-00-111P Rev A00
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