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Transport aspects 2
Figure 20-4 – ODTUCn.ts frame formats
20.3 Multiplexing ODTUCn signals into the OPUCn
Multiplexing an ODTUCn.ts signal into an OPUCn is realized by mapping the ODTUCn.ts signal into ts (of
20n) arbitrary OPUCn 5G tributary slots: OPUCn TS #A1.B1, TS #A2.B2, .. , TS #Ats.Bts with 1 ≤ n*(B1-1)+A1
< n*(B2-1)+A2 < .. < n*(Bts-1)+Ats ≤ 20n.
NOTE 1 – TS #A1.B1, TS #A2.B2, ..., TS #Ats.Bts do not have to be sequential in the OPUCn TS sequence; the TSs can be
arbitrarily selected to prevent bandwidth fragmentation.
NOTE 2 – TS order is illustrated in Figure 20-5.
Figure 20-5 – OPUCn TS order
The OPUCn overhead for these multiplexed signals consists of a payload type (PT), the multiplex structure
identifier (MSI), the OPUCn multiframe identifier, the OPUCn tributary slot overhead carrying the ODTUCn
overhead and depending on the ODTU type one or more bytes reserved for future international
standardization.
20.3.1 ODTUCn.ts mapping into ts OPUCn 5G tributary slots
A 16-byte of the ODTUCn.ts payload signal is mapped into a 16-byte of an OPUCn 5G TS #Ai.Bi (i = 1,..,ts)
payload area, as indicated in Figure 20-6.
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