Page 1121 - 5G Basics - Core Network Aspects

Transport aspects 2

Details of the multiplexing method and mappings are given in clause 19 for OPUk and clause 20 for OPUCn.

Some examples illustrating the multiplexing of 2 ODU0 signals into an ODU1 and of 4 ODU1 signals into an
ODU2 are presented in Appendix III.

8 OTN Interfaces

8.1 Single-OTU (SOTU) interface

The SOTU interface supports one OTU on one OTSiG on a single optical span with 3R regeneration at each
end. The OTSiG is composed of one or more OTSi.
Application codes of the optical tributary signal carrying the OTUk are contained in [ITU-T G.959.1] and
[ITU-T G.693].
Application codes of the optical tributary signal carrying an OTLk.n lane are contained in [ITU-T G.959.1]
and [ITU-T G.695].
Vendor specific application identifiers of the OTSi or OTSiG carrying these OTUs are outside the scope of
this Recommendation.

8.2 Multi-OTU (MOTU) interface

The MOTU interface supports n OTUs on n OTSiG on a single optical span with 3R regeneration at each end.
Each OTSiG is composed of one or more OTSi.

At least one of the OTU signals is present during normal operation.
There is no predefined order in which the OTU signals are taken into service.
NOTE – MOTU interface overhead is not defined. The interface will use the OTU SMOH in this multi-channel interface
for supervision and management. MOTU interface connectivity (TIM) failure reports will be computed from the
individual OTU reports by means of failure correlation in fault management. Refer to the equipment
Recommendations for further details.
Application codes of the optical tributary signal carrying an OTUk are contained in [ITU-T G.959.1] and [ITU-
T G.695].
Vendor specific application identifiers of the OTSi or OTSiG carrying these OTUs are outside the scope of
this Recommendation.

8.3 Single-OTU with management (SOTUm) interface

The SOTUm interface supports one OTUk or one OTUCn and non-associated overhead carried by an
Overhead Communication Channel (OCC). The OTUk is carried over an OTSi and the OTUCn is carried over
an OTSiG.
NOTE – The OTSi is referred to in other clauses as an OCh-P that carries an OTUk.
Application codes of the optical tributary signal carrying the OTUk are contained in [ITU-T G.698.1] and
[ITU-T G.698.2].

Specifications of the OCC carrying the OCh-O are contained in [ITU-T G.7712].
Vendor specific application identifiers of the OTSi or OTSiG carrying these OTUks or OTUCns are outside the
scope of this Recommendation.

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