
Section Monitoring (SM)
Bytes are used for the Trail Trace Identifier (TTI), Parity (BIP-8) and the Backward Error Indicator (BEI) (also known as the Backward Incoming Alignment Error
[BIAE]), Backward Defect Indicator (BDI), and Incoming Alignment Error (IAE).
The TTI is distributed over the multiframe and is 64 bytes in length. It is repeated four times over the multiframe.
SM BIP8
General Communication Channel 0 (GCC0)
Clear channel used for transmission of information between OTU termination points
GCCO Type
Reserved (RES)
bytes are currently undefined in the standard.
7.6.1.3 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.
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