Page 954 - 5G Basics - Core Network Aspects

2 Transport aspects

the CD_timeout_2 value negotiated during the last ITU-T G.994.1 session. The FTU-R shall support all valid
values if it indicated support for ''CD time_out'' during the last ITU-T G.994.1 session.

Field 27 "Supported options" indicates various options supported by the FTU-O. 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-O 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 28 "Annex X descriptor" contains Annex X related parameters indicated by the FTU-O. The field has
variable length; the format and content of this descriptor is defined in Table 12-41.3.

Table 12-41.3 – Format of Annex X descriptor

Field name Format Description

Annex X parameter field One byte Indicates the number of bytes in the Annex X parameter field. This field
length shall be set to ZERO if the Annex X parameter field is not present.
Annex X parameter field Variable See clause X.7.2.1
length

12.3.4.2.2 R-MSG 2
The R-MSG 2 message conveys FTU-R information to the FTU-O. The full list of parameters carried by the
R-MSG 2 message is shown in Table 12-42.

Table 12-42 – R-MSG 2 message

Field Field name Format
1 Message descriptor Message code
2 TPS-TC capabilities See Table 12-43
3 PMS-TC capabilities See Table 12-44
4 Time synchronization requirement One byte

5 Time synchronization period (TSP) One byte
6 Battery operation capability One byte
7 PMD capabilities See Table 12-44.1
8 Supported Options Two bytes
9 Annex X descriptor Variable

Field 1 "Message descriptor" is a unique one-byte code (8616) that identifies the message. See Table 12-7
for a complete list of codes.

Field 2 "TPS-TC capabilities" indicates the TPS-TC capabilities of the FTU-R, as shown in Table 12-43.

944