The OTU overhead is comprised of the SM, GCC0, and RES bytes.
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 TTI Type
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.
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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