Page 865 - 5G Basics - Core Network Aspects

Transport aspects 2

The valid values for L2.2_ETR are all integers from 0 to the configured value of NDR_max (see
clause 11.4.2.2).

The L2.2_ETR shall be represented as a 32-bit unsigned integer expressing the value of ETR in kbit/s. This
data format supports a granularity of 1 kbit/s.

32
A special value 2 −1 indicates that the parameter is undetermined. All other values are reserved by ITU-T.
The DPU derives the DPU-MIB expected throughput reporting parameters L2.2_ETR from L2.2_ETR. During
the L2.2 link state, downstream and upstream actual L2.2_ETR values are reported in the DPU-MIB. During
the L0, L2.1N or L2.1B link state, downstream and upstream L2.2_ETR values of the last status parameter
update in L2.2 are available 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".

11.4.1.1.16 DTU FEC codeword size (NFEC)

The status parameter NFEC is the DTU FEC codeword size as defined in clause 9.3.
The NFEC shall be updated during showtime (L0, L2.1N, L2.1B and L2.2 link states).
The valid values for NFEC are all integers from 32 to 255.

The NFEC shall be represented as an eight-bit unsigned integer.
A special value 0 indicates that the parameter is undetermined.

All other values are reserved by ITU-T.
The NFEC value shall be reported by the FTU-O as DTU-NFEC 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".
11.4.1.1.17 DTU FEC redundancy (RFEC)

The status parameter RFEC is the DTU FEC codeword redundancy as defined in clause 9.3.
The RFEC shall be updated during showtime (L0, L2.1N, L2.1B and L2.2 link states).
The valid values for RFEC are 2, 4, 6, 8, 10, 12, and 16.

The RFEC 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 RFEC value shall be reported by the FTU-O as DTU-RFEC 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".

11.4.1.1.18 FEC codewords per DTU (Q)
The status parameter Q is the number of FEC codewords per DTU as defined in clause 9.3.
The Q shall be updated during showtime (L0, L2.1N, L2.1B and L2.2 link states).

The valid values for Q are all integers from 1 to 16.

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