Page 913 - 5G Basics - Core Network Aspects

Transport aspects 2

12.3.2.2.2 MS messages

An FTU-R selecting the ITU-T G.9701 mode of operation in an ITU-T G.994.1 MS message shall set to ONE
the ITU-T G.9701 SPar(1) bit as defined in Table 11.0.4 of [ITU-T G.994.1]. The NPar(2) (Table 11.69 of
[ITU-T G.994.1]) and SPar(2) (Table 11.70 of [ITU-T G.994.1]) fields corresponding to the ITU-T G.9701
Spar(1) bit are defined in Table 12-17 and Table 12-18, respectively. For each ITU-T G.9701 SPar(2) bit set to
ONE, a corresponding NPar(3) field shall also be present (beginning with Table 11.70.1 in clause 9.4 of
[ITU-T G.994.1]). Table 12-19 shows the definitions and coding for the FTU-R MS NPar(3) fields.

Table 12-17 – FTU-R MS message NPar(2) bit definitions

ITU-T G.994.1 NPar(2) bit Definition of NPar(2) bit

Support of special probe Set to ONE if and only if this bit is set to ONE in both the last previous CLR message
sequence and the last previous CL message. If set to ONE, both the FTU-O and the FTU-R shall
use the special sequence indicated in the last previous CL message during Channel
Discovery 1-1 and Channel Discovery 1 stages.
Default CE length Set to ONE if and only if this bit is set to ONE in both the last previous CLR message
and the last previous CL message. If set to ONE, both the FTU-O and the FTU-R shall
use the default CE length LCP = m × N/64, where m = 10 and the CE length Spar(2) bit
shall be set to ZERO.
Default number of symbol Set to ONE if and only if this bit is set to ONE in both the last previous CLR message
periods in TDD Frame and the last previous CL message. If set to ONE, both the FTU-O and the FTU-R shall
use the default MF value 36 and the number of symbol periods in TDD frame Spar(2)
bit shall be set to ZERO.

Table 12-18 – FTU-R MS message SPar(2) bit definitions

ITU-T G.994.1 SPar(2) bit Definition of SPar(2) bit
Profiles Always set to ONE.
DS transmission band Always set to ZERO.
Number of downstream Always set to ZERO.
symbol positions in TDD
frame
RFIBANDS Always set to ZERO.
Duration of Channel Always set to ZERO.
Discovery 1-1
CE length Shall be set to ONE if and only if this bit is set to ONE in both the last previous CLR
message and the last previous CL message. If set to ONE, indicates that the CE length
multiplier to be used by both the FTU-O and the FTU-R shall be communicated in the
corresponding CE length multiplier NPar(3) field.
If set to ZERO, the default CE length LCP = m × N/64, where m = 10 shall be used.
Number of symbol Shall be set to ONE if and only if both the last previous CLR and the last previous CL
periods in TDD frame messages have set this bit to ONE. If set to ONE, indicates that the number of symbol
periods in TDD frame to be used by both the FTU-O and the FTU-R shall be
communicated in the corresponding NPar(3) field.
If set to ZERO, the mandatory value of MF = 36 shall be used.
IARBANDS Always set to ZERO.
Scrambler seed Always set to ZERO.
Special probe sequence Always set to ZERO.
IDS Always set to ZERO.

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