Page 1330 - 5G Basics - Core Network Aspects

2 Transport aspects

Figure 9-4  FlexO OH structure

The FlexO OH area contains the following subfields (see Figure 9-4):
 multi-frame alignment signal (MFAS)

 status (STAT)
 group identification (GID)
 PHY identification (PID)
 PHY map (MAP)
 OTUC availability (AVAIL)

 cyclic redundancy check (CRC)
 FlexO management communication channel (FCC)
 bits reserved for future international standardization (RES)

 OTN synchronisation message channel (OSMC)
9.2.1 Multi-frame alignment signal (MFAS)
An 8-bit (1 byte) multi-frame alignment signal field is provided and incremented in every frame. This MFAS
field counts 0x00 to 0xFF and provides a 256-frame multi-frame. This central multi-frame is used to lock
2-frame, 4-frame, 8-frame, 16-frame, 32-frame, etc. multi-frame structures of overhead and payload
structure to the principal frame.

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