Page 1154 - 5G Basics - Core Network Aspects

2 Transport aspects

Figure 15-21  Example of nested and cascaded ODU monitored connections

Figure 15-22  Example of overlapping ODU monitored connections

15.8.2.2.1 ODU TCM trail trace identifier (TTI)

For each tandem connection monitoring field, one byte of overhead is allocated for the transport of the 64-
byte trail trace identifier (TTI) specified in clause 15.2 or a discovery message as specified in
[ITU-T G.7714.1] for TCM6.

The ODUk and ODUCn contain one instance of ODU TTI overhead.
The 64-byte TTI signal shall be aligned with the ODU multiframe (see clause 15.6.2.2) and transmitted four
times per multiframe. Byte 0 of the 64-byte TTI signal shall be present at ODU multiframe positions 0000
0000 (0x00), 0100 0000 (0x40), 1000 0000 (0x80) and 1100 0000 (0xC0).

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