Page 1314 - 5G Basics - Core Network Aspects

2 Transport aspects

Appendix XIII

OTUCn sub rates (OTUCn-M) Applications
(This appendix does not form an integral part of this Recommendation.)

XIII.1 Introduction
This appendix describes OTUCn-M application scenarios for the OTUCn-M signal defined in Annex H. It is
assumed that the OTUCn-M processing is performed in the PHY module so that the interface between the
module and framer (MFI) is not changed.
Figures XIII.1 and XIII.2 illustrate two scenarios for subrating applications. The first scenario deploys
subrating between two line ports connecting two L1/L0 ODU cross connects (XC). The second scenario
deploys subrating between transponders which are in a different domain B, which are separated from the
L1 ODU XCs in domain A and/or C.

Figure XIII.1 – OTUCn sub rate application scenario A

Figure XIII.2 – OTUCn sub rate application scenario B

XIII.2 OTUCn-M frame format and rates

As defined in Annex H, the OTUCn-M frame is a type of OTUCn frame which contains n instances of OTUC,
ODUC and OPUC overhead and M 5 Gbit/s OPUCn tributary slots. If a particular value of M is not indicated,
the frame contains 20*n tributary slots.
The use of this notation is illustrated below:

1304