Page 1134 - 5G Basics - Core Network Aspects

2 Transport aspects

Figure 15-6  ODUCn frame structure, ODUCn and OPUCn overhead

15.1 Types of overhead
15.1.1 Optical payload unit overhead (OPU OH)

OPU OH information is added to the OPU information payload to create an OPU. It includes information to
support the adaptation of client signals. The OPU OH is terminated where the OPU is assembled and
disassembled. The specific OH format and coding is defined in clause 15.9.

15.1.2 Optical data unit overhead (ODU OH)
ODU OH information is added to the ODU information payload to create an ODU. It includes information for
maintenance and operational functions to support ODU connections. The ODU OH consists of portions
dedicated to the end-to-end ODU path and to six levels of tandem connection monitoring. The ODU path
OH is terminated where the ODU is assembled and disassembled. The TC OH is added and terminated at
the source and sink of the corresponding tandem connections, respectively. The specific OH format and
coding is defined in clauses 15.6 and 15.8.

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