Page 1238 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 20-1 – OPUCn tributary slot OH allocation

OMFI TSOH
bits 5G TS
4 5 6 7 8
0 0 0 0 0 A.1
0 0 0 0 1 A.2
0 0 0 1 0 A.3
0 0 0 1 1 A.4
0 0 1 0 0 A.5
0 0 1 0 1 A.6
0 0 1 1 0 A.7
0 0 1 1 1 A.8
0 1 0 0 0 A.9
0 1 0 0 1 A.10
0 1 0 1 0 A.11
0 1 0 1 1 A.12
0 1 1 0 0 A.13
0 1 1 0 1 A.14
0 1 1 1 0 A.15
0 1 1 1 1 A.16
1 0 0 0 0 A.17
1 0 0 0 1 A.18
1 0 0 1 0 A.19
1 0 0 1 1 A.20

20.2 ODTUCn definition
The optical data tributary unit Cn (ODTUCn) carries a justified ODUk signal. There is one type of ODTUCn:
– ODTUCn.ts (ts = 1 to 20n) in which a ODUk (k = 0,1,2,2e,3,4,flex) signal is mapped via the generic
mapping procedure (GMP) defined in clause 20.5.
Optical data tributary unit Cn.ts (ODTUCn.ts)

The optical data tributary unit Cn.ts (ODTUCn.ts) is a structure which consists of an ODTUCn.ts payload area
and an ODTUCn.ts overhead area (Figure 20-4). The ODTUCn.ts payload area has 119×ts (ts=1 to 20n)
16-byte-columns and 8 rows (15232×ts bytes) and the ODTUCn.ts overhead area has one times 6 bytes. The
ODTUCn.ts is carried in "ts" 5G tributary slots of an OPUCn.
The location of the ODTUCn.ts overhead depends on the OPUCn tributary slot used when multiplexing the
ODTUCn.ts in the OPUCn (see clause 20.1.1). The single instance of an ODTUCn.ts overhead is located in the
OPUCn TSOH of the last OPUCn tributary slot allocated to the ODTUCn.ts.
The ODTUCn.ts overhead carries the GMP justification overhead as specified in clause 20.4.
The ODTUCn.ts overhead carries the GMP justification overhead consisting of 6 bytes of justification control
(JC1, JC2, JC3, JC4, JC5, JC6) which carry the GMP Cm and ΣC8D information.

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