TTITTI
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/BIAE3rd byte Bit 1-4: BEI/BIAE
Bits 1-4 show BIP violations BEI/BIAE (Backward Error Indication / Backward
Incoming Alignment Error). Only 10111011 shows BIAE=true.
Bits 1-4Bits 1-4 BIP violationsBIP violations
00000000 0
00010001 1
00100010 2
00110011 3
01000100 4
01010101 5
01100110 6
01110111 7
10001000 8
1001 to 11111001 to 1111 0
3rd byte Bit 5: BDI3rd byte Bit 5: BDI
BDI (Backward Defect Indication) is set to "1" to indicate a signal fail status,
otherwise it is set to "0".
3rd byte Bit 6-8: STAT3rd byte Bit 6-8: STAT
Bits 6-8 show TCM status.
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