Page 1106 - 5G Basics - Core Network Aspects

2 Transport aspects

NOTE – Figure 6-2 (bottom) describes the optical structure of OTUk interfaces. The optical structure of OTUCn
interfaces with standardized application code are described in the interface specific Recommendations (ITU-T G.709.x
series).

Figure 6-2  Optical structure of the OTN interfaces

6.2 Information structure for OTN interfaces
The information structure for OTN interfaces is represented by information containment relationships and
flows. The principal information containment relationships are described in Figures 6-3, 6-4, 6-5, 6-6, 6-7
and 6-8.
For supervision purposes in OTN interfaces with optical layer overhead, the OTUk/OTUk-v/OTUkV signal is
terminated whenever the OCh signal is terminated and the OTUCn signal may be terminated when the
OTSiA signal is terminated. For supervision purposes in OTN interfaces without optical layer overhead, the
OTUk/OTUk-v/OTUkV and OTUCn signals are terminated whenever the interface signal is terminated.

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