Page 1198 - 5G Basics - Core Network Aspects

2 Transport aspects

MFAS Multi- Column
bits frame Frame
(6)78 row row 1 ..... 15 16 17 18 19 20 21 22 23 24 25 26 ..... 3823 3824
1 1
2 2
(0)00 TSOH TS1 .....
3 3
4 4
5 1
6 2
(0)01 TSOH TS2 .....
7 3
8 4
.....

13 1
14 2
(0)11 TSOH TS4 .....
15 3
16 4
17 1 1
18 2 2
(1)00 TSOH TS1 or TS5 .....
19 3 3
20 4 4

..... .....
29 13 1
30 14 2
(1)11 TSOH TS4 or TS8 .....
31 15 3 1 2 3 4 5 6 7 8 1 2 7 8 1.25G TS#
32 16 4 1 2 3 4 1 2 3 4 1 2 3 4 2.5G TS#
G.709-Y.1331(12)_F19-1

Figure 19-1 – OPU2 tributary slot allocation

Table 19-1 – OPU2 tributary slot OH allocation

MFAS MFAS
TSOH
bits bits TSOH 1.25G TS
2.5G TS
7 8 6 7 8
0 0 1 0 0 0 1
0 1 2 0 0 1 2
1 0 3 0 1 0 3
1 1 4 0 1 1 4
1 0 0 5
1 0 1 6
1 1 0 7
1 1 1 8
19.1.2 OPU3 tributary slot allocation

Figure 19-2 presents the OPU3 2.5G tributary slot allocation and the OPU3 1.25G tributary slot allocation.
An OPU3 is divided into sixteen 2.5G tributary slots numbered 1 to 16, or in thirty-two 1.25G tributary slots
numbered 1 to 32.
– An OPU3 2.5G tributary slot occupies 6.25% of the OPU3 payload area. It is a structure with 238
columns by 64 (16  4) rows (see Figures 19-2 and 19-8) plus a tributary slot overhead (TSOH). The
sixteen OPU3 2.5G TSs are byte interleaved in the OPU3 payload area and the sixteen OPU3 TSOHs
are frame interleaved in the OPU3 overhead area.

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