Page 1240 - 5G Basics - Core Network Aspects

2 Transport aspects

A byte of the ODTUCn.ts overhead is mapped into a TSOH byte of TS #Ats.Bts within columns 15 and 16,
rows 1 to3 of the last OPUCn 5G tributary slot allocated to the ODTUCn.ts.

The remaining OPUCn TSOH bytes are reserved for future international standardization.

119
1 2 3 ts  ts
1

2 3
ODTUCn.ts JC4 JC1 4 5

JC5 JC2 6
JC6 JC3 7
8

OMFI OPUCn TS #A1.B1 OPUCn TS #A2.B2 OPUcn TS #A ts Bts
bits
45678 TS #A1.B1 1 1 1
00000 RES RES TS #A.2.B2 2 2 2
RES RES RES RES RES RES RES RES TS #Ats.Bts4 3 4 3 4 3 4
OPUCn tributary slots RES RES JC4 JC5 JC1 JC2 5 6 5 6 ........... 5 6

10011 OPUCn TSOH JC6 JC3 7 8 7 8 7 8
of TS #A1.B1, A2.B2, ..., Ats.Bts
1 2 119 1 2 119 1 2 119
G.709-Y.1331(16)_F20-6

Figure 20-6 – Mapping of ODTUCn.ts into 'ts' OPUCn 5G tributary slots

20.4 OPUCn multiplex overhead and ODTU justification overhead
The OPUCn multiplex overhead consists of a multiplex structure identifier (MSI), an OPU multiframe
identifier (OMFI), an ODTU overhead and bytes reserved for future international standardization.
The OPUCn MSI, OMFI and RES overhead locations are shown in Figure 20-7.

ODTUCn.ts overhead
The ODTUCn.ts overhead carries the GMP justification overhead consisting of 18 bits of justification control
(JC1[3-8], JC2[3-8], JC3[3-8]) which carry the 10-bit GMP Cm information and ODUk (k=0,1,2,2e,3,4,flex)
specific 30 bits of justification control (JC1[1-2], JC2[1-2], JC3[1-2], JC4, JC5, JC6) which carry the 18-bit GMP
C8D information.
The JC1, JC2, JC3, JC4, JC5 and JC6 overhead locations are shown in Figure 20-7.

1230