Page 1130 - 5G Basics - Core Network Aspects

2 Transport aspects

14 Overhead information carried over the OSC and OCC

The overhead information carried over the OSC consists of the OTS-O, OMS-O, OCh-O and OTSiG-O. The
information content of this overhead is defined in clause 15. The format, structure and bit rate of this
overhead is not defined in this Recommendation.

The overhead information carried over the OCC consists of the OCh-O. The information content of this
overhead is defined in clause 15. The format, structure and bit rate of this overhead is defined in
[ITU-T G.7712].
General management communications (COMMS)

Depending on an operator's logical management overlay network design, general management
communications (COMMS) may also be transported within the OSC. Therefore, the OSC for some
applications may also transport general management communications. General management
communications may include signalling, voice/voiceband communications, software download, operator-
specific communications, etc.

OTN synchronisation message channel (OSMC)
For synchronisation purposes, the OSC OSMC signal is defined as an OTN synchronisation message channel
to transport SSM and PTP messages.
NOTE 1 – Support of OSC OSMC in a MOTUm interface is optional.
NOTE 2 – Equipment designed prior to Edition 4.6 of this recommendation may not be able to support OSC OSMC.

15 Overhead description
An overview of OTS-O, OMS-O, OCh-O and OTSiG-O information carried within the OSC is presented in
Figure 15-1. An overview of OCh-O information carried within the OCC is presented in Figure 15-2.

Figure 15-1  OTS-O, OMS-O, OCh-O and OTSiG-O information carried within the OSC

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