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2 Transport aspects
11.4.1.1.13 Net data rate in L2.2 (L2.2_NDR)
The status parameter net data rate in the L2.2 link state (L2.2_NDR) is defined in Table 13-13 as
L2.2_NDR = L2.2_DPR – L2.2_DPReoc,
where the L2.2_DPR represents the DTU payload rate (defined in Table 13-13) during the L2.2 link state and
the L2.2_DPReoc the L2.2 link state eoc data rate (defined in Table 13-13), that shall be used for the purpose
of this calculation.
The L2.2_NDR shall be calculated by the receiver at the entry into the L2.2 link state using equations for
L2.2_DPR presented in Table 13-13. It shall not be updated during the L0, L2.1N, L2.1B, and L3 link states.
The valid values for L2.2_NDR are all integers from 0 to the configured value of NDR_max
(see clause 11.4.2.2).
The L2.2_NDR shall be represented as a 32-bit unsigned integer expressing the value of L2.2_NDR in kbit/s.
This data format supports a granularity of 1 kbit/s.
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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 reporting parameters L2.2_NDR from L2.2_NDR. During the L2.2 link state,
downstream and upstream actual L2.2_NDR values are reported in the DPU-MIB. During the L0, L2.1N or
L2.1B link state, downstream and upstream L2.2_NDR values of the last status parameter update in the L2.2
link state 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".
11.4.1.1.14 Expected throughput (L2.1_ETR)
The status parameter expected throughput in L2.1 link state (L2.1_ETR) is defined in Table 13-13 as
L 1.2 _ ETR ( 1 L 1.2 _ RTxOH) L 1.2 _ NDR
The ETR shall be calculated by the receiver and updated during the L2.1 link state only upon OLR using
equations for NDR and RTxOH presented in Table 13-13. It shall not be updated during the L0, L2.2, and L3
link states.
The valid values for L2.1_ETR are all integers from 0 to the configured value of NDR_max (see
clause 11.4.2.2).
The L2.1_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.
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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 L2.1_ETR from L2.1_ETR. During
the L2.1N or L2.1B link state, downstream and upstream actual L2.1_ETR values are reported in the
DPU-MIB. During the L0 or L2.2 link state, downstream and upstream expected L2.1_ETR values of the last
status parameter update in the L2.1N and L2.1B link states 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".
11.4.1.1.15 Expected throughput (L2.2_ETR)
The status parameter expected throughput in L2.2 link state (L2.2_ETR) is defined in Table 13-13 as
L 2.2 _ ETR 1 ( L 2.2 _ RTxOH) L 2.2 _ NDR
The ETR shall be calculated by the receiver and updated during the L2.2 link state only using equations for
NDR and RTxOH presented in Table 13-13. It shall not be updated during the L0, L2.1N, L2.1B and L3 link
states.
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