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2 Transport aspects
A byte of the ODU2 signal is mapped into an information byte of the ODTU23 (see Figure 19-25B). Eight
times per 32 OPU3 frames, it is possible to perform either a positive or a negative justification action. The
frames in which justification can be performed are related to the TSOH of the OPU3 1.25G TSs in which the
ODTU23 is mapped (Figure 19-2). Figure 19-25B shows the case with mapping in OPU3 1.25G TS 1, 2, 5, 9,
10, 25, 26 and 32.
Figure 19-25A – ODTU23 frame format and mapping of ODU2
(mapping in 2.5G TS 1,5,9,10)
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