Page 1312 - 5G Basics - Core Network Aspects

2 Transport aspects

Appendix XII

Terminology changes between ITU-T G.709 Edition 4 and Edition 5
(This appendix does not form an integral part of this Recommendation.)

In Edition 5 of this Recommendation a number of terms used in Editions 1 to 4 have been modified. Table
XII.1 provides the mapping between these terms in Editions 1 to 4 and Edition 5.

Table XII.1 – Terminology mapping
ITU-T G.709 Edition 1 to 4 ITU-T G.709 Edition 5
OTM-0.m SOTU
OTM-0.mvn (multi-lane) SOTU
OTM-nr.m MOTU
OTM-1.m SOTUm

OTM-n.m MOTUm
Optical Channel (OCh) OCh
Optical Channel with reduced functionality (OChr) OCh-P
Optical Channel Payload (OCh-P) OCh-P
Optical Channel Overhead (OCh-OH) OCh-O
Optical channel Transport Unit (OTU) Optical Transport Unit (OTU)
Optical channel Data Unit (ODU) Optical Data Unit (ODU)
Optical channel Payload Unit (OPU) Optical Payload Unit (OPU)
Optical channel Data Tributary Unit (ODTU) Optical Data Tributary Unit (ODTU)
Optical channel Data Tributary Unit Group (ODTUG) Optical Data Tributary Unit Group (ODTUG)
Optical Multiplex Unit (OMU) -
Optical Channel Carrier (OCC) -
Optical Channel Carrier - overhead (OCCo) -
Optical Channel Carrier – payload (OCCp) -
Optical Channel Carrier with reduced functionality (OCCr) -
Optical Carrier Group (OCG) -
Optical Carrier Group with reduced functionality (OCGr) -
Optical Carrier Group of order n (OCG) -
OTM Overhead Signal (OOS) Optical Supervisory Channel (OSC)
Optical Transport Lane (OTLk.n) OTLk.n lane

Optical Transport Lane Carrier Group (OTLCG) -
Optical Transport Lane Carrier (OTLC) -
OPS0 OPS
OPSn OPS
OPSMnk OPS
OTS-OH OTS-O
OMS-OH OMS-O
In Edition 5.0 of this Recommendation the following new terms are introduced:

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