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ohuk
Contributor
1,466 Views
Message 1 of 25

BT slowdowns again - oversubscribed like hell I guess or problems in their network?

Looks like we're getting back to the days when I posted this...:

 

https://community.bt.com/t5/ADSL-Copper-Broadband-Speed/Who-to-complain-formally-to-about-slow-broad...

 

It's been recurring again, this morning it took ages to open most websites, my wife's double espresso went cold while she was trying to read news. Of course speedtest.btwholesale.com is snappy (I guess BT gives traffic to that site priority) and my line checks out OK:

 

 Download speedachieved during the test was - 2.09 Mbps
 For your connection, the acceptable range of speeds is 1.2 Mbps-4 Mbps.
 IP Profile for your line is - 2.6 Mbps

 

Upload speed achieved during the test was - 0.29Mbps
 Additional Information:
 Upstream Rate IP profile on your line is - 0.45 Mbps



We were unable to identify any performance problem with your service at this time.
It is possible that any problem you are currently, or had previously experienced may have been caused by traffic congestion on the Internet or by the server you were accessing responding slowly.
If you continue to encounter a problem with a specific server, please contact the administrator of that server in the first instance.

 

Sync speed is 2.9Mbps is anyone wonders. I had better performing service from BT ten years ago...

 

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imjolly
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Message 2 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

can you post stats from your router as looking back I thought you moved to adsl2 but up profile of 0.45mb suggests adslmax



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AndyRD
Beginner
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Message 3 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

@ohuk. You're not alone with the rubbish throughput with BT Broadband. I'm on an upto 8Mb service and spitting distance from the exchange. When everything is fine, I can see download speeds of 6.5-7Mbps and an upload speed of 380kbps.

 

Lately though, my trasnfer rates have been pathetic. All day yesterday my download speed was well below 1mbps and today it deteriorated to the point of 300kbps (dnld) and 120kbps (upload). I work from home and this sort of service is making it harder and harder. Knowing that it's not a connection problem just makes it more annoying.

 

These figures are from speedtest.net and I know they're not conclusive as other factors will play a part. The bandwidth to the server host for one. However, they are in line with my experience when using the Internet and are closer to reality than the BT Wholesale tester which denies any problem.

 

As always the BTwholesale test says that my throughput is ok, but then I'd expect it to. It's probably sitting in my local exchange...

 

This is definitely a BT congestion problem. If not on their network then with their peering and transit connections to the wider Internet.

ohuk
Contributor
1,422 Views
Message 4 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

@AndyRD I work from home as well so I have been forced to install two broadband connections, wife and son are permantly on BT and suffer the most 🙂 .

 

@imjolly thanks, router stats below, modulation looks like ADSL2+ to me. With almost 6km to the exchange I guess I was overly optimistic 🙂 .

 

1. Product name:BT Home Hub
2. Serial number:+068340+NQ43832726
3. Firmware version:Software version 4.7.5.1.83.8.130.1.17 (Type A) Last updated Unknown
4. Board version:BT Hub 4A
5. ADSL uptime:0 days, 07:31:55
6. Bandwidth:444 / 2909
7. Data sent/received:68.7 MB / 268.3 MB
8. Broadband username:bthomehub@btbroadband.com
9. BT FON:Yes
10. 2.4 GHz Wireless network/SSID:xxxxxx
11. 2.4 GHz Wireless connections:Enabled (802.11 b/g/n (Recommended)) 20 MHz, WPS enabled
12. 2.4 GHz Wireless security:WPA and WPA2
13. 2.4 GHz Wireless channel:Automatic / 11
14. 5 GHz Wireless network/SSID:xxxxxx
15. 5 GHz Wireless connections:Enabled (802.11 n 40 MHz (Recommended)) 20/40 MHz, WPS enabled
16. 5 GHz Wireless security:WPA2
17. 5 GHz Wireless channel:Automatic / 40
18. Firewall:Default
19. MAC Address:c8:91:f9:81:c7:98
20. VPI/VCI:0 / 38
21. Modulation:G.992.5 Annex A
22. Latency type:Interleaved
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imjolly
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Message 5 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

modulation of 992.5 is adsl2+ but up profile is only 0.45mb whereas adsl2 is 0.83mb

 

connection time is only 7hrs was that manual reset or hub dropping connection

 

can you post the 2 lines of stats from logs so can see current noise margin please



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ohuk
Contributor
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Message 6 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

The resets will have to have been the homehub dropping the connection, last two drops:

 

10:18:24, 21 Sep.(426739.750000) DSL noise margin: 17.30 dB upstream, 3.30 dB downstream
10:18:24, 21 Sep.(426738.840000) DSL line rate: 444 Kbps upstream, 2909 Kbps downstream
10:17:36, 21 Sep.(426691.050000) DSL is down after 3481 minutes uptime
10:17:36, 21 Sep.(426691.050000) ETHoA is down after 3481 minutes uptime
10:17:35, 21 Sep.(426690.700000) PPPoA is down after 3480 minutes uptime [Waiting for Underlying Connection (WAN DSL -​ Up)]
10:17:31, 21 Sep.(426686.520000) PPP LCP Send Termination Request [User request]

 

00:16:26, 19 Sep.(217822.900000) DSL noise margin: 17.50 dB upstream, 3.10 dB downstream
00:16:26, 19 Sep.(217822.090000) DSL line rate: 445 Kbps upstream, 2944 Kbps downstream
00:15:36, 19 Sep.(217772.320000) DSL is down after 3627 minutes uptime
00:15:36, 19 Sep.(217772.320000) ETHoA is down after 3627 minutes uptime
00:15:35, 19 Sep.(217771.980000) PPPoA is down after 3627 minutes uptime [Waiting for Underlying Connection (WAN DSL -​ Up)]
00:15:31, 19 Sep.(217767.890000) PPP LCP Send Termination Request [User request]
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johnb53
Aspiring Contributor
1,400 Views
Message 7 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

I am with you.

 

Sadly I've found that all I get on these forums is continual requests for stats from lines.

 

Sometimes it pays to step back and look at the wider picture. I used to get 3.5Mb for about 5 years from another ISP. I only changed because the old ISP introduced a "fair" usage limit. BT offered truly unlimited but sadly cannot provide. I will be switching as soon as my contract expires.

 

I know what I think BT stands for but an ISP?

 

No Internet

No Service

No Provider of anything.

imjolly
Distinguished Sage
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Message 8 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

@johnb53

 

asI said on your own thread as you cannot maintain a stable connection for sufficient time to let DLM automatically improve your connection you need to get an engineer to fix your connection dropping problem. Once that is fixed your connection should improve.



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imjolly
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Message 9 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

@ohuk. I don't think the move to adsl2 has helped.  Your connection speed is about same as adslmax but your noise margin is now down to 3db and with the more aggressive system on line noise this is not helping your throughput especially at night when noise margin may drop even lower

 

you may have been better staying on adslmax as the change to adsl2 has not even increased your up speed



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johnb53
Aspiring Contributor
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Message 10 of 25

Re: BT slowdowns again - oversubscribed like hell I guess or problems in their network?

I am aware of what you said but the fact remains that if I need a second engineer to fix a fault in 6 months it suggests an unstable line.

 

Maybe I have been spoiled working on stable networks for the last eighteen years -- where an instability like this on a previously stable connection would almost certainly be caused by a change which preceded the start of the instability. I will confess I work on switched and routed networks not ADSL but I wasn't aware that the latter was that much more unstable.