Page 931 - 5G Basics - Core Network Aspects

Transport aspects 2

12.3.3.2.8 R-VECTOR-FEEDBACK

The R-VECTOR-FEEDBACK message delivers the vectoring feedback report. While receiving O-P-VECTOR 2
the FTU-R should avoid changing receiver parameters that may have an impact on the vectoring feedback
reporting.
NOTE – Receiver parameters may include FEQ.

Table 12-30 – R-VECTOR-FEEDBACK message

Field Field name Format
1 Message descriptor Message code

2 Superframe count Two bytes
3 Vectoring feedback data N_VFRB bytes
Field 1 "Message descriptor" is a unique one-byte code (8316) that identifies the message. See Table 12-7
for a complete list of codes.

Field 2 "Superframe count" indicates the count of the superframe of the sync symbol to which the report
relates. The count shall be represented as a 16-bit unsigned integer.

Field 3 "Vectoring feedback data" indicates the reported set of VF samples requested by the FTU-O with
parameters defined in fields 2, 5, 6 and 7 of the O-VECTOR-FEEDBACK message. The reported VF data shall
use the VFRB format defined in clause 10.3.2.4.1.

12.3.3.2.9 O-SNR
The O-SNR message requests the downstream SNR.

Table 12-31 – O-SNR message

Field Field name Format
1 Message descriptor Message code

2 Request for downstream SNR SNR request descriptor
Field 1 "Message descriptor" is a unique one-byte code (0416) that identifies the message. See Table 12-7
for a complete list of codes.
Field 2 "Request for downstream SNR" indicates the set of subcarriers for which the downstream SNR
report shall be delivered in R-SNR message. The requested set of subcarriers for which SNR shall be
reported shall have a format as presented in Table 12-32.
Table 12-32 – SNR request descriptor

Byte Content of field

1 Number of bands SNR shall be reported.
Valid values are from 0 to 8.

2-4 Bits 0-11: index of the lowest frequency tone of band 1
Bits 12-23: index of highest frequency tone of band 1
5-7 (if applicable) Bits 0-11: index of the lowest frequency tone of band 2
Bits 12-23: index of highest frequency tone of band 2
etc. etc.

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