GCC0-GCC2
TCM1-TCM6
These fields are used to carry transmission management and signaling
information. These bytes can be edited in hexadecimal value.
TCM1-TCM6 consists of the following parameters:
TTI byte (Trail Trace Identifier)
BIP-8 byte (Bit Interleaved Parity level 8 code)
3rd byte:
Bits 1-4: BIP violations (BEI/BIAE)
Bit 5: Signal fail status (BDI)
Bits 6-8: Status (STAT)
The TTI byte and 3rd byte can both be edited by launching the OTUk TCMn-
TTI dialog box, which is similar to the dialog box used to edit SM.
TTI
The TTI (Trail Trace Identifier) is a 64-Byte signal that occupies one byte of
the frame and is aligned with the OTUk multiframe.
SAPI (Source Access Point Identifier)
DAPI (Destination Access Point Identifier)
Operator (32-Byte Operator specific)
3rd byte Bit 1-4: BEI/BIAE
Bits 1-4 show BIP violations BEI/BIAE (Backward Error Indication / Backward
Incoming Alignment Error). Only 1011 shows BIAE=true.
Bits 1-4 BIP violations
0000 0
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 to 1111 0
3rd byte Bit 5: BDI
BDI (Backward Defect Indication) is set to "1" to indicate a signal fail status,
otherwise it is set to "0".
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