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Keith_Beddoe
Distinguished Sage
Distinguished Sage
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Message 11 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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This was early in the morning, so I doubt it was them, more likely it was just the home hub disconnecting.

 

03:54:03, 03 Jan.    (17728.430000) DSL is down after 293 minutes uptime
03:54:03, 03 Jan.    (17728.430000) ETHoA is down after 293 minutes uptime
03:54:02, 03 Jan.    (17728.020000) PPPoA is down after 293 minutes uptime [Waiting for Underlying Connection (WAN DSL -​ Up)]
03:53:59, 03 Jan.    (17724.830000) PPP LCP Send Termination Request [User request]

smithyg
Aspiring Contributor
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Message 12 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Hello Keith and thanks for the information.

 

It seems from the log that what I am seeing may be "remote management":

03:54:06, 03 Jan.    (17731.360000) CWMP: Server URL: https://pbthdm.bt.mo; Connecting as user: ACS username

 

(I guess that is something similar to what I saw in the previous Home Hub 1 log that gave me a fright.)

 

I note that today's Home Hub 4 log gave the noise margin figures:

03:54:33, 03 Jan.    (17758.530000) DSL noise margin: 5.60 dB upstream, 9.10 dB downstream
03:54:32, 03 Jan.    (17757.610000) DSL line rate: 612 Kbps upstream, 6168 Kbps downstream

 

I think that is above what you mentioned in the previous post ("What you need to look at is the downstream noise margin to see if its dropping below 6dB.").

 

I've now changed the admin password on the Home Hub 1 offline, but I don't really want to plug it back in until the evening problem resurfaces (now at 18 hours continuous connections).

 

Kind regards,

Graham.

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smithyg
Aspiring Contributor
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Message 13 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Still using the HH4, after a few days 24x7 continuous connnection at 6.261 Mbps, yesterday (7 Jan 2018) at 10:40 there was a reset of some form (not invoked by me) and the connection came back at the increased speed of 8.109 Mbps.  This was fine during the remainder of daylight time but I knew at that speed the connection would be useless in the evening and, when I tried to use it at 16:30, sure enough it was indeed unusable (6 to 7 Mbps work fine but whenever the speed creeps up to 8 Mbps, the connection becomes unusable in the evenings and nights - this is a "cliff edge"-like effect and not a gradual degradation).

 

So, some minutes after that, I restarted the HH4 manually using the web interface and it reconnected at a lower speed of 7.224 Mbps and at that point it was usable again.

 

There didn't seem a lot of point in reconnecting the HH1 then as things were working okay once more and also I have tried activating BT WiFi (to see if I can at least get some form of connection during the evening broadband blackouts - there is apparently one BT WiFi access point within range albeit not all the time and a bit weak signal) and I gather the HH4 should be left alone for a few days for its own BT WiFi to be activated).

 

I have been collecting a few noise figures (which appear in the log when a connection is made - I tried a few restarts yesterday evening to see what would happen to the connection speed) - see below.

 

It seems to me that I am in a situation where the automated process that sets the connection speed can't cope with a situation where the line cannot sustain the same connection speed at all times of day and repeatedly pushes up the speed beyond the point at which the connection is usable in the evenings/nights.  Also from experience previously that (unlike yesterday) resetting the router doesn't normally reduce the speed to a usable 6 or 7 Mbps.  As there is apparently no method that BT can override the speed setting process to put an upper limit on it, it seems my problem is incurable.

 

It was suggested to me by BT and BT Openreach separately that changing to VDSL may bring the problem to an end (the cabinet being several hundreds of yards away compared to the exchange being a couple of miles away), but I don't particularly wish to do this because I don't need an increased speed, nor the extra cost, not to mention there is no 100% guarantee that it would solve the problem if it is related to the copper wires that reach as far as the cabinet.

 

Noise figures at assorted days and times of day:

 

02:09:56, 08 Jan.    ( 88.800000) DSL noise margin: 5.10 dB upstream, 6.10 dB downstream
02:09:55, 08 Jan.    ( 87.790000) DSL line rate: 612 Kbps upstream, 7128 Kbps downstream

23:01:10, 07 Jan.    ( 88.650000) DSL noise margin: 5.30 dB upstream, 6.00 dB downstream
23:01:09, 07 Jan.    ( 87.480000) DSL line rate: 612 Kbps upstream, 7128 Kbps downstream

21:24:29, 07 Jan.    ( 87.870000) DSL noise margin: 5.40 dB upstream, 6.00 dB downstream
21:24:28, 07 Jan.    ( 87.180000) DSL line rate: 612 Kbps upstream, 7224 Kbps downstream

17:38:22, 07 Jan.    ( 88.400000) DSL noise margin: 5.20 dB upstream, 6.00 dB downstream
17:38:21, 07 Jan.    ( 87.360000) DSL line rate: 612 Kbps upstream, 7224 Kbps downstream

10:40:33, 07 Jan.    (42314.530000) DSL noise margin: 5.30 dB upstream, 6.10 dB downstream
10:40:32, 07 Jan.    (42313.630000) DSL line rate: 612 Kbps upstream, 8109 Kbps downstreams

23:56:33, 06 Jan. ( 95.380000) DSL noise margin: 4.90 dB upstream, 9.00 dB downstream
23:56:32, 06 Jan. ( 94.490000) DSL line rate: 612 Kbps upstream, 6261 Kbps downstream

03:54:33, 03 Jan.    (17758.530000) DSL noise margin: 5.60 dB upstream, 9.10 dB downstream
03:54:32, 03 Jan.    (17757.610000) DSL line rate: 612 Kbps upstream, 6168 Kbps downstream

 

Regards,

Graham.

 

 

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Keith_Beddoe
Distinguished Sage
Distinguished Sage
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Message 14 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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There used to be an option to fix the noise margin so that it did not drop below 6dB, but in your case its not doing that, and the dropouts are probably being cause by REIN https://en.wikipedia.org/wiki/Repetitive_Electrical_Impulse_Noise

 

The problem is, identifying the cause.

 

Keith_Beddoe
Distinguished Sage
Distinguished Sage
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Message 15 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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The moderators can help in this case, perhaps fixing the noise margin at 8dB.

 

DanielS
Moderator
Moderator
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Message 16 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Hi @smithyg,

 

If your line looks like it can benefit from a change in the noise margin, we can change it from 6dB to 9dB. We'll discuss all of that after we run a few of our tests.

 

We can certainly look into this for you. To get in touch with us, please click on my user name and then on contact the mods. That'll bring up a web form for you to complete.

 

 

Thanks

 

DanielS

smithyg
Aspiring Contributor
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Message 17 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Keith and Daniel, many thanks - that sounds very promising.

 

I've filled in the form as requested.

 

Kind regards,

Graham.

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smithyg
Aspiring Contributor
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Message 18 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Many thanks to Patrick from the moderators for the help with this.  The noise margin is now set to 9dB, which has vastly improved the situation.

 

Regards,

Graham.

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StuartH
Moderator
Moderator
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Message 19 of 19

Re: Slowing connection speed re: evening performance problems / Internet dropouts

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Hi @smithyg

 

Thanks for the kind words any issues again please post back.

 

Stuart