Page 866 - 5G Basics - Core Network Aspects

2 Transport aspects

The Q shall be represented as an eight-bit unsigned integer.

A special value 255 indicates that the parameter is undetermined.
All other values are reserved by ITU-T.

The Q value shall be reported by the FTU-O as DTU-Q in the DPU-MIB.
The downstream and upstream values shall be reported in the DPU-MIB.

During the L3 link state (see Figure 12-1), the values of the last update are available in the DPU-MIB, until
the FTU-O transitions to the O-INIT/HS state, at which time the values may become "undetermined".

11.4.1.1.19 Bit Allocation on data subcarriers (bi)
The status parameter bi is the bit allocation values as defined in clause 10.2.1.4 on data symbols in the
normal operation interval (NOI) in L0, and on data subcarriers on the RMC symbols during the L2.1N, L2.1B
and L2.2 link states.
The bi shall be updated during showtime (L0, L2.1N, L2.1B and L2.2 link states).
The valid values for bi are all integers from 0 to 14.

The bi shall be represented as an eight-bit unsigned integer.
A special value 255 indicates that the parameter is undetermined. All other values are reserved by ITU-T.

The bi value shall be reported by the FTU-O as BITSps in the DPU-MIB.
The downstream and upstream values shall be reported in the DPU-MIB.

During the L3 link state (see Figure 12-1), the values are "undetermined".
11.4.1.1.20 Bit Allocation on RMC subcarriers (bRMCi)

The status parameter bRMCi is the bit allocation values as defined in clause 10.2.1.4 on RMC subcarriers in
RMC symbols.

The bRMCi shall be updated during showtime (L0, L2.1N, L2.1B and L2.2 link states).
The valid values for bi are 0 and all integers from 2 to 6.

The bRMCi shall be represented as an eight-bit unsigned integer.
A special value 255 indicates that the parameter is undetermined. All other values are reserved by ITU-T.

The bRMCi value shall be reported by the FTU-O as BITS-RMCps in the DPU-MIB.
The downstream and upstream values shall be reported in the DPU-MIB.
During the L3 link state (see Figure 12-1), the values are "undetermined".

11.4.1.2 Test parameters

11.4.1.2.1 Hlog-psg
Hlog provides an estimate of the insertion loss of the wireline channel.

The definition of the insertion loss is −20*LOG10(|U2(f)/U1(f)|) dB. U1(f) is the voltage as a function of
frequency measured across the load impedance RL in the absence of the wireline channel as shown in
Figure 11-7 for the downstream direction. U2(f) is the voltage as a function of frequency measured across
the load impedance RL in the presence of the wireline channel as shown in Figure 11-8 for the downstream
direction.

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