Page 1225 - 5G Basics - Core Network Aspects

Transport aspects 2

Figure 19-23B – ODTU12 frame format and mapping of ODU1
(mapping in 1.25G TS1 and TS4)

19.5.2 Mapping ODU1 into ODTU13
A byte of the ODU1 signal is mapped into an information byte of the ODTU13 (Figure 19-24A). Column 119
of the ODTU13 is fixed stuff. An all-0s pattern is inserted in the fixed stuff bytes. Once per 16 OPU3 frames,
it is possible to perform either a positive or a negative justification action. The frame in which justification
can be performed is related to the TSOH of the OPU3 2.5G TS in which the ODTU13 is mapped (Figure 19-
2). Figure 19-24A shows the case with mapping in OPU3 2.5G TS3.

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