Page 956 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 12-44.1 – PMD capabilities of the FTU-R

Field name Format Description
FTU-R maximum bit One byte: [000000aa] Indicates the maximum bit loading supported by the FTU-R
loading transmitter:
• aa = 00 – maximum bit loading = 12 bits
• aa = 01 – maximum bit loading = 13 bits
• aa = 10 – maximum bit loading = 14 bits
• aa = 11 – Reserved by ITU-T
Field 8 "Supported options" indicates various options supported by the FTU-R. It is encoded as a bitmap in
each byte.
The first byte shall be used to indicate only the options for which settings are conveyed via the upstream
RMC command field "settings associated with supported options" (see Table 9-8):
– Bit 0 (LSB) shall be set to 1 if the FTU-R supports the RPF indicator bits in the upstream RMC
command (see Table 9-8), set to 0 otherwise;
– Other bits of the first byte are reserved by ITU-T.
The second byte shall be used to indicate all other options:

– Bit 0 shall be set to 1 if FTU-O supports datagram eoc command (see clause 11.2.2.4.2) and shall
be set to 0 otherwise;
– Other bits of the second byte are reserved by ITU-T.

All bits reserved by ITU-T shall be set to 0 and ignored by the receiver.Field 9 "Annex X descriptor" contains
Annex X related parameters indicated by the FTU-R. The field has variable length; the format and content of
this descriptor is defined in Table 12-44.2.

Table 12-44.2 – Format of Annex X descriptor

Field name Format Description
Annex X parameter One byte Indicates the number of bytes in the Annex X parameter field. This field
field length shall be set to ZERO if the Annex X parameter field is not present.
Annex X parameter Variable See clause X.7.2.2
field length

12.3.4.2.3 O-TPS

The O-TPS message conveys the TPS-TC configuration for both the upstream and the downstream
directions (determined by FTU-O). It is based on the capabilities that were indicated in O-MSG 1 and R-MSG
2 messages. The list of parameters carried by the O-TPS message is shown in Table 12-45.

Table 12-45 – O-TPS message

Field Field name Format
1 Message descriptor Message code
2 TPS-TC configuration See Table 12-46

3 Time synchronization enable One byte
Field 1 "Message descriptor" is a unique one-byte code (0816) that identifies the message. See Table 12-7
for a complete list of codes.

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