APS/PCC
The TTI byte and 3rd byte can both be edited by launching the ODUk PM-
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
BEI (Backward Error Indication) shows the count of interleaved-bit blocks that
have been detected in error by the corresponding ODUk path monitoring
sink using the BIP-8 code.
Bits 1-4 shows BIP violations.
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".
3rd byte Bit 6-8: STAT
STAT (Path Monitoring Status) indicates the presence of a maintenance
signal.
STAT Signal type
000 Reserved
001 Normal path signal
010 Reserved
011 Reserved
100 Reserved
101 ODUk-LCK
110 ODUk-OCI
111 ODUk-AIS
APS/PCC has four bytes. Requests/Status is defined for First byte. The request
or status is shown in bits 1-4.
The protection type is shown in bit 5-8.
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