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Transport aspects 2

ODTUk.ts ts-1 ts
overhead 1 2 3 . . . . . . . . . . . . . . . j  j 
1
2
3

.
.
ODTUk.ts payload .
.
.
ts .
.

r-1
r
k = 2, 3, 4
G.709-Y.1331(12)_F19-6

Figure 19-6 – ODTUk.ts frame formats

Table 19-6 – ODTUk.ts characteristics

ODTUk.ts payload ODTUk.ts overhead
j r ts
bytes bytes
ODTU2.ts 476 32 1 to 8 15232  ts 1  6
ODTU3.ts 119 128 1 to 32 15232  ts 1  6

ODTU4.ts 95 160 1 to 80 15200  ts 1  6

19.3 Multiplexing ODTU signals into the OPUk
Multiplexing an ODTU01 signal into an OPU1 is realized by mapping the ODTU01 signal in one of the two
OPU1 1.25G tributary slots.
Multiplexing an ODTU12 signal into an OPU2 is realized by mapping the ODTU12 signal in one of the four
OPU2 2.5G tributary slots or in two (of the eight) arbitrary OPU2 1.25G tributary slots: OPU2 TSa and TSb
with 1  a < b  8.
Multiplexing an ODTU13 signal into an OPU3 is realized by mapping the ODTU13 signal in one of the sixteen
OPU3 2.5G tributary slots or in two (of the thirty-two) arbitrary OPU3 1.25G tributary slots: OPU3 TSa and
TSb with 1  a < b  32.
Multiplexing an ODTU23 signal into an OPU3 is realized by mapping the ODTU23 signal in four (of the
sixteen) arbitrary OPU3 2.5G tributary slots: OPU3 TSa, TSb, TSc and TSd with 1  a < b < c < d  16 or in
eight (of the thirty-two) arbitrary OPU3 1.25G tributary slots: OPU3 TSa, TSb, TSc, TSd, TSe, TSf, TSg and TSh
with 1  a < b < c < d < e < f < g < h  32.

NOTE – a, b, c, d, e, f, g and h do not have to be sequential (a = i, b = i+1, c = i+2, d = i+3, e=i+4, f=i+5, g=i+6, h=i+7); the
values can be arbitrarily selected to prevent bandwidth fragmentation.
Multiplexing an ODTU2.ts signal into an OPU2 is realized by mapping the ODTU2.ts signal in ts (of the eight)
arbitrary OPU2 1.25G tributary slots: OPU2 TSa, TSb, .. , TSp with 1  a < b < .. < p  8.

Multiplexing an ODTU3.ts signal into an OPU3 is realized by mapping the ODTU3.ts signal in ts (of the thirty-
two) arbitrary OPU3 1.25G tributary slots: OPU3 TSa, TSb, .. , TSq with 1  a < b < .. < q  32.

Multiplexing an ODTU4.ts signal into an OPU4 is realized by mapping the ODTU4.ts signal in ts (of the
eighty) arbitrary OPU4 1.25G tributary slots: OPU4 TSa, TSb, .. , TSr with 1  a < b < .. < r  80.

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