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[Weaver]

Suddenly line 4’s downstream sync rate has dropped by about 0.5Mbps, from 2.8 to 2.3 Mbps, and the modems dropped the connection. Can you help me see what’s going wrong with it here?

Line 4 latest summary stats today are included below. The link dropped, and following this, the downstream sync rate was as low as ~1.8Mbps with a downstream SNRM of ~5dB. I reset the SNRM to the 3dB which is usual for the link and forced a retrain, which brought the downstream sync rate up to 2.3Mbps as seen in the stats immediately below.

Also, attached - full stats for all lines :

• “2019-10-05 all modems stats.zip” : today’s all-lines’ raw complete stats, plain text, zipped up
• “2019-07-25*.txt.zip” -  an earlier all-lines dataset is attached also for comparison.

Line 4 summary stats today (and full stats are in the zip file)::

=~=~=~=~=~=~=~=~=~=~=~= Plink log 2019.10.05 03:23:53 =~=~=~=~=~=~=~=~=~=~=~=
supervisor@ap's password:
 > xdslctl info --stats
xdslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:   8000
Last initialization procedure status:   0
Max:   Upstream rate = 435 Kbps, Downstream rate = 2576 Kbps
Bearer:   0, Upstream rate = 505 Kbps, Downstream rate = 2329 Kbps

Link Power State:   L0
Mode:         ADSL2 Annex A
TPS-TC:         ATM Mode(0x0)
Trellis:      U:ON /D:ON
Line Status:      No Defect
Training Status:   Showtime
      Down      Up
SNR (dB):    3.1       5.9
Attn(dB):    65.0       41.2
Pwr(dBm):    18.1       12.4

         ADSL2 framing
         Bearer 0
MSGc:      51      11
B:      27      62
M:      8      1
T:      3      1
R:      16      12
S:      3.0284      3.9216
L:      634      153
D:      1      8

         Counters
         Bearer 0
SF:      65729      64524
SFErr:      62      0
RS:      1404968      1096736
RSCorr:      6087      174
RSUnCorr:   63      0

ReXmt:      10659      0
ReXmtCorr:   10649      0
ReXmtUnCorr:   73      0

         Bearer 0
HEC:      96      0
OCD:      0      0
LCD:      0      0
Total Cells:   5867274      1280527
Data Cells:   4047947      266524
Drop Cells:   0
Bit Errors:   1606      0

ES:      44527      124
SES:      2665      0
UAS:      1232      849
AS:      1076

         Bearer 0
INP:      27.00      2.50
INPRein:   0.00      0.00
delay:      8      8
PER:      16.18      16.66
OR:      28.17      8.16
AgR:      2347.19   512.07

Bitswap:   350/350      16/16

Total time = 5 days 11 hours 36 min 40 sec
FEC:      2661788      30975
CRC:      323776      91
ES:      44527      124
SES:      2665      0
UAS:      1232      849
LOS:      11      0
LOF:      59      0
LOM:      2      0
Latest 15 minutes time = 6 min 40 sec
FEC:      2376      64
CRC:      30      0
ES:      24      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 15 minutes time = 15 min 0 sec
FEC:      3752      115
CRC:      32      0
ES:      30      0
SES:      0      0
UAS:      54      54
LOS:      0      0
LOF:      0      0
LOM:      0      0
Latest 1 day time = 11 hours 36 min 40 sec
FEC:      11261      4627
CRC:      63      8
ES:      55      6
SES:      0      0
UAS:      54      54
LOS:      0      0
LOF:      0      0
LOM:      0      0
Previous 1 day time = 24 hours 0 sec
FEC:      1063739      16400
CRC:      179427      55
ES:      15539      41
SES:      2289      0
UAS:      1055      692
LOS:      10      0
LOF:      51      0
LOM:      2      0
Since Link time = 17 min 55 sec
FEC:      6087      174
CRC:      62      0
ES:      54      0
SES:      0      0
UAS:      0      0
LOS:      0      0
LOF:      0      0
LOM:      0      0
NTR: mipsCntAtNtr=0 ncoCntAtNtr=0

—

[Weaver]

History of SNRM through the day up to the drop of the link and resetting of downstream SNRM. Red, the lower trace, is downstream :

[Weaver]

Line dropped again around mid-day today, sync rate remained the same.

I tried to perform a copper line test on clueless.aa.net.uk; got an error - Any idea what this means ?
    BT Test xDSL Copper Test:Rejected 2960:Downstream system not available   
    BT Test xDSL Copper Test:Rejected 2960:Downstream system not available

[burakkucat]

Two ZIP format files have been sent to you as attachments to an e-mail message.

I tried to perform a copper line test on clueless.aa.net.uk; got an error - Any idea what this means ?
    BT Test xDSL Copper Test:Rejected 2960:Downstream system not available   
    BT Test xDSL Copper Test:Rejected 2960:Downstream system not available

I presume the "Downstream system not available" refers to a BT Wholesale system that is downstream from A&A and, as it was unavailable for A&A to use, the test could not be performed.

[Weaver]

Seems that the lightning repairs have cured the downstream ~20% speed droop anyway, as this morning the downstream speed is back up to ~2.8 Mbps where it should be. In fact - Live sync rates:
  #1: down 2990 kbps, up 560 kbps
  #2: down 2880 kbps, up 547 kbps
  #3: down 2998 kbps, up 512 kbps
  #4: down 2799 kbps, up 502 kbps

And line 3 upstream is cured.

[burakkucat]

That's good to know.

[Weaver]

The line 3 upstream thing has been going on and on - for at least ten months, maybe a lot longer, I’d have to look back. It’s been such a complete pain.

Yet no matter what I do, I cannot get the combined upstream speed tester figure back to 1.5 Mbps+ as it should be. Will have to do some more testing now things are improved.