Page 1315 - 5G Basics - Core Network Aspects

Transport aspects – OTN 2

– OTUC2-25: a 125 Gbit/s OTU signal with 25 (5 Gbit/s) tributary slots and 2 instances of OxUC
overhead
– OTUC2-30: a 150 Gbit/s OTU signal with 30 (5 Gbit/s) tributary slots and 2 instances of OxUC
overhead
– OTUC2: a 200 Gbit/s OTU signal with 40 (5 Gbit/s) tributary slots and 2 instances of OxUC
overhead
– OTUC3-50: a 250 Gbit/s OTU signal with 50 (5 Gbit/s) tributary slots and 3 instances of OxUC
overhead
The bit rate of an OTUCn-M signal is (10n + 119 * M) / (10n + 119 * 20 * n) * OTUCn bit rate. The choice of
which TS are assigned to each of the OTUC instances, and hence the signal rate of that OTUC instance, is
vendor or application specific.

XIII.3 OTUCn-M fault condition
For the case where subrating is used between transponders the following checks should be made.
In the transmit (source) direction, transponder X should verify that the OPU tributary slots with the
Availability bit of their OPUCn MSI overhead set to "available" are carried transparently by the OTUCn-M.
For the case where one or more availability bits for the the tributary slots that are not carried transparently
are set to "available", an OTUCn-AIS should be inserted by Transponder X.
In the receive (sink) direction, transponder Y should check for a mismatch between received and expected
OTUCn-M. If such a mismatch is detected an OTUCn-AIS should be inserted by Transponder Y.

Figure XIII.3 – OTUCn sub rate mismatch fault condition

1305