Page 1322 - 5G Basics - Core Network Aspects

2 Transport aspects

NNI Network Node Interface

ODU Optical Data Unit
OH Overhead

OPU Optical Payload Unit
OSMC OTN synchronization messaging channel

OTL Optical Transport Lane
OTLk.n Group of n Optical Transport Lanes that carry one OTUk
OTLC.n Group of n Optical Transport Lanes that carry one OTUC of an OTUCn

OTN Optical Transport Network
OTU Optical Transport Unit

PCS Physical Coding Sublayer
PHY Physical Layer
PID Physical Identification

PTP Precise Timing Protocol
RES Reserved for future international standardization

RPF Remote Physical Layer Fault
RS Regeneration Section

RS Reed-Solomon
SM Section Monitoring

SSM Source Sync Message
STAT Status
UM Unique Marker

UP Unique Padding

5 Conventions
This Recommendation uses the following conventions defined in [ITU-T G.870]:
– k

– Cn
– m
– n
– r
Transmission order: The order of transmission of information in all the diagrams in this Recommendation is
first from left to right and then from top to bottom. Within each byte the most significant bit is transmitted
first. The most significant bit (bit 1) is illustrated on the left side of all diagrams.
Value of reserved bit(s): The value of an overhead bit, which is reserved for future international
standardization, shall be set to "0''.
Value of non-sourced bit(s): Unless stated otherwise, any non-sourced bits shall be set to "0".

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