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[roseway]

At about 02:10 this morning my connection dropped after 120 days of uptime at 3.6 dB downstream SNRM, and 15 minutes later it reconnected at 79999/20000 with a downstream SNRM of 1.6 dB. It's stayed at exactly that value up to the time of writing. There was no power cut.

Stats before and after are shown below. Can anyone explain this rather odd event?

Stats 15 June:

Code: [Select]

Stats recorded 15 Jun 2020 00:00:33

DSLAM type / SW version:    BDCM:0xc01c (192.28) / v0xc01c
Modem/router firmware:      AnnexA version - A2pv6F039i.d24e
DSL mode:                   VDSL2 Profile 17a
Status:                     Showtime
Uptime:                     119 days 12 hours 6 min 23 sec
Resyncs:                    0 (since 12 Jun 2020 07:02:31)
           
                Downstream    Upstream
Line attenuation (dB):      0.0        0.0
Signal attenuation (dB):    Not available on VDSL2       
Connection speed (kbps):    75288        20000
SNR margin (dB):            3.6        8.9
Power (dBm):                13.7        1.5
Interleave depth:           8        1
INP:                        48.00        0
G.INP:                      Enabled        Not enabled
Vectoring status:           5 (VECT_UNCONFIGURED)       

RSCorr/RS (%):              0.3600        0.0000
RSUnCorr/RS (%):            0.0000        0.0000
ES/hour:                    0        0

Stat today 16 June:

Code: [Select]

Stats recorded 16 Jun 2020 11:03:33

DSLAM type / SW version:    BDCM:0xc190 (193.144) / v0xc190
Modem/router firmware:      AnnexA version - A2pv6F039i.d24e
DSL mode:                   VDSL2 Profile 17a
Status:                     Showtime
Uptime:                      8 hours 40 min 12 sec
Resyncs:                    1 (since 12 Jun 2020 07:02:31)
           
                Downstream    Upstream
Line attenuation (dB):      0.0        0.0
Signal attenuation (dB):    Not available on VDSL2       
Connection speed (kbps):    79999        20000
SNR margin (dB):            1.6        9.5
Power (dBm):                13.6        1.8
Interleave depth:           16        1
INP:                        48.00        0
G.INP:                      Enabled        Not enabled
Vectoring status:           5 (VECT_UNCONFIGURED)       

RSCorr/RS (%):              0.2015        0.0000
RSUnCorr/RS (%):            0.0000        0.0000
ES/hour:                    0.92        2.39


[mrk26]

Fw updated on card, that's what I can see 

[tiffy]

Fw updated on card, that's what I can see 

Yes, certainly looks that way.

Would guess you have remained on DS Re-Tx low profile also (INP is less than 50) you can of course confirm this with your bearer 0 INPRein zero value.
Have found on the 3 lines I monitor (Huawei DSLAM's) that DS Re-Tx profiles have all migrated to Re-Tx high profile over the last few months with no particular change in line stat's otherwise noted.

[j0hn]

Possibly new line cards fitted.

Has the cabinet ever had an HD expansion fitted?
It might have 1 now.

You've probably just reconnected before some crosstalkers after work on the cabinet, still at 3dB.

Edit: I've only seen that line card/firmware version once before, on a G.Fast connection oddly enough.

[roseway]

I missed the fact that the firmware version had changed. I suppose that my line must have been one of the first to connect after the change, with the rest connecting shortly afterwards. By the time DSLstats took its next sample, crosstalk had dropped the SNRM to 1.6 dB, and the actual target SNRM didn't show in the recorded stats.

I'll have a look at the cabinet later to see if there are any visible changes. Up to now there haven't been.

[Later] No, there aren't any visible changes.