Page 1151 - 5G Basics - Core Network Aspects

Transport aspects 2

Table 15-4  ODU PM BEI interpretation

ODU PM BEI
BIP violations
bits 1 2 3 4

0 0 0 0 0
0 0 0 1 1
0 0 1 0 2
0 0 1 1 3
0 1 0 0 4
0 1 0 1 5
0 1 1 0 6
0 1 1 1 7
1 0 0 0 8
1 0 0 1 0
to
1 1 1 1

15.8.2.1.5 ODU PM status (STAT)

For path monitoring, three bits are defined as status bits (STAT). They indicate the presence of a
maintenance signal (see Table 15-3).

A P-CMEP sets these bits to "001".
The ODUk and ODUCn contain one instance of ODU PM STAT overhead.

Table 15-5  ODU PM status interpretation

PM byte 3
Status
bits 6 7 8

0 0 0 Reserved for future international standardization
0 0 1 Normal path signal
0 1 0 Reserved for future international standardization
0 1 1 Reserved for future international standardization
1 0 0 Reserved for future international standardization
1 0 1 Maintenance signal: ODU-LCK
ODUk: Maintenance signal: ODU-OCI
1 1 0
ODUCn: Reserved for future international standardization
1 1 1 Maintenance signal: ODU-AIS

15.8.2.1.6 ODU PM delay measurement (DMp)

For ODU path monitoring, a one-bit path delay measurement (DMp) signal is defined to convey the start of
the delay measurement test.

The ODUk and ODUCn contain one instance of ODU PM DMp overhead.
The DMp signal consists of a constant value (0 or 1) that is inverted at the beginning of a two-way delay
measurement test. The transition from 01 in the sequence …0000011111…, or the transition from 10
in the sequence …1111100000… represents the path delay measurement start point. The new value of the
DMp signal is maintained until the start of the next delay measurement test.

1141