Page 850 - 5G Basics - Core Network Aspects

2 Transport aspects

Table 11-48.3 – L2.1 downstream transmission parameters

Byte Content

[0000 000a]
1 a = 0: indicate the real relative gain compensation factor.
a = 1: indicate the complex relative gain compensation factor.
2 and 3 Two bytes for the start subcarrier index (Note 1)
Two bytes for the stop subcarrier index
4 and 5
(Note 1)
Variable Data subcarrier parameter block
A variable number of bytes describing the subcarrier parameter field for each subcarrier (Note 2)
NOTE 1 – Subcarriers outside this set shall be unused in L2.1, by setting b i = 0 while keeping g i the same as in L0.
NOTE 2 – The formatting of the data subcarrier parameter field and the valid range of the values shall be the same as those
specified for OLR type 3 with real or complex relative gain compensation factor (see clause 11.2.2.5 and Tables 11-14 to 11-17).
NOTE 1 – In the aim to reduce power consumption, the FTU-O should not transmit on RMC symbols outside the
downstream subcarrier set assigned for L2.1.

NOTE 2 – Due to the use of scheduled discontinuous operation during L2.1, use of shorter DTUs may be beneficial. The
requirements for DTU size settings are specified in clause 13.4.1.

Table 11-48.4 – L2.2 downstream transmission parameters

Byte Content
1 and 2 Two bytes for the start subcarrier index (Note 1)
Two bytes for the stop subcarrier index
3 and 4
(Note 1)
Variable Data subcarrier parameter block
A variable number of bytes describing the subcarrier parameter field for each subcarrier (Note 2)
NOTE 1 – The subcarrier set shall be the same as in L2.1 (see Table 11-48.3).
NOTE 2 – The formatting of the data subcarrier parameter field and the valid range of the values shall be the same as those
specified for OLR type 1 (see clause 11.2.2.5, Table 11-10 and Table 11-11).

The upstream gi values shall not change at the transition to either L2.1 link state or L2.2 link state, except
for the subcarriers outside the set of subcarriers specified in 11-48.2. Outside that set, the upstream gi
values shall be set to 0.

Table 11-48.5 – Battery powered status command (FTU-R to FTU-O)

Name Length (Bytes) Byte Content
Battery powered 3 2 0816 (Note 1)
status
3 One Byte encoding FTU-R battery primitive as
follows (Note 1):
0116: FTU-R is not battery powered
0216: FTU-R is battery powered

NOTE – All other values are reserved by ITU-T.

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