Page 1171 - 5G Basics - Core Network Aspects

Transport aspects 2

17.2.1 Mapping a CBR2G5 signal (e.g., STM-16, CMGPON_D/CMGPON_U2) into OPU1

Groups of eight successive bits (not necessarily being a byte) of the CBR2G5 signal are mapped into a data
(D) byte of the OPU1 (see Figure 17-2). Once per OPU1 frame, it is possible to perform either a positive or a
negative justification action.

Column #
...........
15 16 17 18 3824
1 RES JC D D 3805D D
Row # 2 RES JC D D 3805D D
3805D
D
3 RES
D
JC
D
4 PSI NJO PJO D 3805D D
G.709-Y.1331(12)_F17-2
Figure 17-2  Mapping of a CBR2G5 signal into OPU1
17.2.2 Mapping a CBR10G signal (e.g., STM-64, CMXGPON_D/CMXGPON_U2) into OPU2
Groups of eight successive bits (not necessarily being a byte) of the CBR10G signal are mapped into a data
(D) byte of the OPU2 (see Figure 17-3). 64 fixed stuff (FS) bytes are added in columns 1905 to 1920. Once
per OPU2 frame, it is possible to perform either a positive or a negative justification action.

Column #
15 16 17 ..... 1904 1905 ..... 1920 1921 ..... 3824

1 RES JC 118 16D 16FS 119 16D
Row # 2 RES JC 118 16D 16FS 119 16D
119 16D
118 16D
16FS
JC
3 RES
4 PSI NJO PJO 15D + 117 16D 16FS 119 16D
G.709-Y.1331(12)_F17-3
Figure 17-3  Mapping of a CBR10G signal into OPU2

17.2.3 Mapping a CBR40G signal (e.g., STM-256) into OPU3
Groups of eight successive bits (not necessarily being a byte) of the CBR40G signal are mapped into a data
(D) byte of the OPU3 (see Figure 17-4). 128 fixed stuff (FS) bytes are added in columns 1265 to 1280 and
2545 to 2560. Once per OPU3 frame, it is possible to perform either a positive or a negative justification
action.

.....
..... ... Column # ... ...
15 16 17 1264 1265 1280 1281 2544 2545 2560 2561 3824
1 RES JC 78 16D 16FS 79 16D 16FS 79 16D
Row # 2 RES JC 78 16D 16FS 79 16D 16FS 79 16D
78 16D
79 16D
79 16D
16FS
3 RES
JC
16FS
4 PSI NJO PJO 15D + 77 16D 16FS 79 16D 16FS 79 16D
G.709-Y.1331(12)_F17-4
Figure 17-4  Mapping of a CBR40G signal into OPU3
17.2.4 Mapping a CBR10G3 signal (e.g., 10GBASE-R) into OPU2e

Groups of eight successive bits (not necessarily being a byte) of the CBR10G3 signal are bit-synchronously
mapped into a data (D) byte of the OPU2e (see Figure 17-5). 64 fixed stuff (FS) bytes are added in columns
1905 to 1920.

1161