Page 1226 - 5G Basics - Core Network Aspects

2 Transport aspects

A byte of the ODU1 signal is mapped into an information byte of the ODTU13 (see Figure 19-24B). Column
119 of the ODTU13 is fixed stuff. An all-0s pattern is inserted in the fixed stuff bytes. Twice 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 ODTU13 is
mapped (Figure 19-2). Figure 19-24B shows the case with mapping in OPU3 1.25G TS2 and TS25.

Figure 19-24A – ODTU13 frame format and mapping of ODU1
(mapping in 2.5G TS3)

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