I was meaning more for ADSL connections as LATN & SATN data for VDSL2 connections is useless.
The line & signal attenuation per band from pbParams is fine, but nobody has yet sussed how that would translate to a single overall value.
VDSL2:-
Down Up
SNR (dB): 6.0 5.9
Attn(dB): 24.8 0.0
Pwr(dBm): 12.6 7.0
Down Up
SNRM(dB): 6.0 5.9
LATN(dB): 24.8 0.0
SATN(dB): 0.0 0.0
xdslcmd info --pbParams
xdslcmd: ADSL driver and PHY status
Status: Showtime
Retrain Reason: 0
Last initialization procedure status: 0
Max: Upstream rate = 4027 Kbps, Downstream rate = 21400 Kbps
Bearer: 0, Upstream rate = 4124 Kbps, Downstream rate = 19066 Kbps
Discovery Phase (Initial) Band Plan
US: (7,32) (871,1205) (1972,2782)
DS: (33,859) (1216,1961) (2793,3970)
Medley Phase (Final) Band Plan
US: (7,32) (871,1194)
DS: (33,859) (1216,1852)
VDSL Port Details Upstream Downstream
Attainable Net Data Rate: 4027 kbps 21400 kbps
Actual Aggregate Tx Power: 7.0 dBm 12.6 dBm
====================================================================================
VDSL Band Status U0 U1 U2 U3 U4 D1 D2 D3
Line Attenuation(dB): 8.2 54.9 N/A N/A N/A 22.0 67.4 N/A
Signal Attenuation(dB): 8.2 54.1 N/A N/A N/A 31.1 67.4 N/A
SNR Margin(dB): 6.0 5.9 N/A N/A N/A 5.9 6.0 N/A
TX Power(dBm): 0.6 5.8 N/A N/A N/A 11.5 6.0 N/A
ADSL (G.DMT) (a bit more informative):-
Down Up
SNRM(dB): 4.0 16.0
LATN(dB): 47.5 27.5
SATN(dB): 47.5 0.0
ADSL2:-
Down Up
SNRM(dB): 5.5 6.6
LATN(dB): 65.0 37.2
SATN(dB): 71.4 37.5
ADSL2+:-
Down Up
SNRM(dB): 6.1 5.8
LATN(dB): 49.0 27.3
SATN(dB): 49.0 27.4
The ADSL examples are from different users' connections.