Hi
Everything went back to normal now.
SNR steady solid at 6.9dB for 15 hours now. But why is line attenuation increase to 12.7? Before used to be 11.5?
DSLAM type / SW version: BDCM:0xa48c (164.140) / v0xa48c
Modem/router firmware: AnnexA version - A2pv6F039g1.d24m
DSL mode: VDSL2 Profile 17a
Status: Showtime
Uptime: 15 hours 36 min 9 sec
Resyncs: 0 (since 15 May 2019 09:49:15)
Downstream Upstream
Line attenuation (dB): 12.7 0.0
Signal attenuation (dB): Not available on VDSL2
Connection speed (kbps): 79999 19999
SNR margin (dB): 6.9 12.5
Power (dBm): 12.5 0.6
Interleave depth: 16 1
INP: 48.00 0
G.INP: Enabled Not enabled
Vectoring status: 5 (VECT_UNCONFIGURED)
Attenuation reported by modems is not the same attenuation as your physical line that BT might use to judge distance or speeds your line might get, with the modems attenuation more an average based on all frequencies received which varies meaning this attenuation figure can vary also. Your true physical line attenuation which is measured at a fixed frequency of 300KHz is very likely completely unchanged.
The trouble is with modem stats is you can't really take any single figure and draw any conclusion from it changing, as its a balancing act you need to consider other values alongside it.
I suspect your modem is receiving higher frequencies than it did before so your average attenuation has gone up, because these higher frequencies have a higher attenuation. This actually shows an improvement in your line, the opposite of what we might expect seeing that attenuation figure go upwards.
Regards
Phil