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Transport aspects 2

Table 19-4 – OPU4 tributary slot OH allocation

OMFI bits TSOH OMFI bits TSOH OMFI bits TSOH OMFI bits TSOH
2 3 4 5 6 7 8 1.25G TS 2 3 4 5 6 7 8 1.25G TS 2 3 4 5 6 7 8 1.25G TS 2 3 4 5 6 7 8 1.25G TS
0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 21 0 1 0 1 0 0 0 41 0 1 1 1 1 0 0 61

0 0 0 0 0 0 1 2 0 0 1 0 1 0 1 22 0 1 0 1 0 0 1 42 0 1 1 1 1 0 1 62
0 0 0 0 0 1 0 3 0 0 1 0 1 1 0 23 0 1 0 1 0 1 0 43 0 1 1 1 1 1 0 63

0 0 0 0 0 1 1 4 0 0 1 0 1 1 1 24 0 1 0 1 0 1 1 44 0 1 1 1 1 1 1 64
0 0 0 0 1 0 0 5 0 0 1 1 0 0 0 25 0 1 0 1 1 0 0 45 1 0 0 0 0 0 0 65

0 0 0 0 1 0 1 6 0 0 1 1 0 0 1 26 0 1 0 1 1 0 1 46 1 0 0 0 0 0 1 66
0 0 0 0 1 1 0 7 0 0 1 1 0 1 0 27 0 1 0 1 1 1 0 47 1 0 0 0 0 1 0 67

0 0 0 0 1 1 1 8 0 0 1 1 0 1 1 28 0 1 0 1 1 1 1 48 1 0 0 0 0 1 1 68

0 0 0 1 0 0 0 9 0 0 1 1 1 0 0 29 0 1 1 0 0 0 0 49 1 0 0 0 1 0 0 69
0 0 0 1 0 0 1 10 0 0 1 1 1 0 1 30 0 1 1 0 0 0 1 50 1 0 0 0 1 0 1 70

0 0 0 1 0 1 0 11 0 0 1 1 1 1 0 31 0 1 1 0 0 1 0 51 1 0 0 0 1 1 0 71
0 0 0 1 0 1 1 12 0 0 1 1 1 1 1 32 0 1 1 0 0 1 1 52 1 0 0 0 1 1 1 72

0 0 0 1 1 0 0 13 0 1 0 0 0 0 0 33 0 1 1 0 1 0 0 53 1 0 0 1 0 0 0 73

0 0 0 1 1 0 1 14 0 1 0 0 0 0 1 34 0 1 1 0 1 0 1 54 1 0 0 1 0 0 1 74
0 0 0 1 1 1 0 15 0 1 0 0 0 1 0 35 0 1 1 0 1 1 0 55 1 0 0 1 0 1 0 75

0 0 0 1 1 1 1 16 0 1 0 0 0 1 1 36 0 1 1 0 1 1 1 56 1 0 0 1 0 1 1 76
0 0 1 0 0 0 0 17 0 1 0 0 1 0 0 37 0 1 1 1 0 0 0 57 1 0 0 1 1 0 0 77

0 0 1 0 0 0 1 18 0 1 0 0 1 0 1 38 0 1 1 1 0 0 1 58 1 0 0 1 1 0 1 78

0 0 1 0 0 1 0 19 0 1 0 0 1 1 0 39 0 1 1 1 0 1 0 59 1 0 0 1 1 1 0 79
0 0 1 0 0 1 1 20 0 1 0 0 1 1 1 40 0 1 1 1 0 1 1 60 1 0 0 1 1 1 1 80

19.2 ODTU definition
The optical data tributary unit (ODTU) carries a justified ODU signal. There are two types of ODTUs:

1) ODTUjk ((j,k) = {(0,1), (1,2), (1,3), (2,3)}; ODTU01, ODTU12, ODTU13 and ODTU23) in which an
ODUj signal is mapped via the asynchronous mapping procedure (AMP) as defined in clause 19.5;
2) ODTUk.ts ((k,ts) = (2,1..8), (3,1..32), (4,1..80)) in which a ODUj (ODU0, ODU1, ODU2, ODU2e,
ODU3, ODUflex) signal is mapped via the generic mapping procedure (GMP) defined in clause 19.6.

Optical data tributary unit jk
The optical data tributary unit jk (ODTUjk) is a structure which consists of an ODTUjk payload area and an
ODTUjk overhead area (Figure 19-5). The ODTUjk payload area has c columns and r rows (see Table 19-5)
and the ODTUjk overhead area has "ts" times 4 bytes, of which "ts" times 1 byte can carry payload. The
ODTUjk is carried in "ts" 1.25G or 2.5G tributary slots of an OPUk.

The location of the ODTUjk overhead depends on the OPUk tributary slot(s) used when multiplexing the
ODTUjk in the OPUk (see clauses 19.1.1, 19.1.2, 19.1.3). The ts instances of the ODTUjk overhead might not
be equally distributed.
The ODTUjk overhead carries the AMP justification overhead as specified in clause 19.4.

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