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Transport aspects 2
Figure 19-24B – ODTU13 frame format and mapping of ODU1
(mapping in 1.25G TS2 and TS25)
19.5.3 Mapping ODU2 into ODTU23
A byte of the ODU2 signal is mapped into an information byte of the ODTU23 (Figure 19-25A). Four times
per sixteen OPU3 frames, it is possible to perform either a positive or a negative justification action. The
four frames in which justification can be performed are related to the TSOH of the OPU3 2.5G TSs in which
the ODTU23 is mapped (Figure 19-2). Figure 19-25A shows the case with mapping in OPU3 2.5G TS1, TS5,
TS9 and TS10.
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