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Aspiring Contributor
Message 1 of 18

Broadband pseed/latency problems, exchange oversubscribed



I am stuggling with the quality of my BB connection for about a year now. BT is not receptive to complaints, they claim that the speedtest shows nothing wrong.

Problem is that the exchange Im connected to is way oversubscribed. Last upgrade to the exchange is done on 2006, so looks like no investment plans here. Also the exchange is not on the upgrade plans, so it feels like we're living in a black hole as far as BT wholesale is concerned. To top it up, the exchange is not equiped for 3rd party vendors, so we're realy stuck with BT.

Speed tests reveal that the speed is ok, 8MB -256KB. But the latency is way off, 200ms at the moment.


I reads omewhere that BT has to adhere to some performance indicators with regards to oversubscription but have not found details on it. I have asked for a deadlock letter a week ago but no reaction so far. 


Any suggestions on how what 'preasure' can be applied on BT /BT Whole sales to get some resolution to the oversubscription problem?

Local MP is already meeting with BT representatives but not having much luck either, he keeps being fobbed off by BT.


PS. Exchange in question is the FORD exchange in the EH37 postcode area

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Distinguished Sage
Message 2 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

Hi Welcome to the community forums


Here is a basic guide to getting help from the community members done by CL Keith Please read through the link posted

once you have posted the information asked for then the community members can help you more


Also if you would post you exchange name we may be able to  help further with any update information 


Thank You

This is a customer to customer self help forum the only BT presence here are the forum moderators

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Aspiring Contributor
Message 3 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

The exchange name was mentioned in the original post.

 I'm reasonable familiar with the in's and outs of BB diagnostics. My connection to the exchange seem to be very normal, no real issues.

Exchange gives ADSL type service.

Problem for the speed test is that it measures speeds for about 30 sec. When I download a software upgrade for my PC ( MAC) things are very different, the download speed is all over the place, with very frequent drops to well below 1MB/s


Modem statistics ( CISCO 527W )

DSL Status:Showtime
DSL Modulation Mode:G.DMT
Downstream Rate:8128 Kbps
Upstream Rate:448 Kbps
Downstream Noise Margin:9.4db
Upstream Noise Margin:23.0db
Downstream Line Attenuation:18.5
Upstream Line Attenuation:9.5
Downstream Transmit Power:19.8
Upstream Transmit Power:






Speed test ( 18:11 )


MAC's view of network speed during BT speedtest, note the variance in download speed.




BT test results


Download speed: 6.04

Upload speed: 0.27

Latency: 60.36 ms


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Distinguished Sage
Message 4 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

can you please post the further diagnostics part of the speed test 



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Aspiring Contributor
Message 5 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

further test results, not...

type Exception report


description The server encountered an internal error () that prevented it from fulfilling this request.


java.lang.IllegalStateException: Cannot forward after response has been committed


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.



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Distinguished Sage
Message 6 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

with the download speed you are getting there is no over capacity problems if there was your speeds would be substantially lower than they are
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Distinguished Sage
Message 7 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

could you please post a trace route using windows command prompt to
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Distinguished Sage
Message 8 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

ok please try the speedtest again at a later time
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Aspiring Contributor
Message 9 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

Please read my ful post.

As mentioned earlier the download test only measures the speed forabout  30 sec, when I download a large file , like a patch for the PC the speed very quickly drops below 1MB/s. 

More important is the latency, as I found at various places on the internet a good indicator for oversubscription, see following post:


The latency causes skype to fail, watching streaming films from lovefilm to pause frequently, BBCIplayer to fail ,etc etc. This is not detected by the BT speed test.

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Aspiring Contributor
Message 10 of 18

Re: Broadband pseed/latency problems, exchange oversubscribed

result of traceroute ( still running)


traceroute: Warning: has multiple addresses; using

traceroute to (, 64 hops max, 52 byte packets

 1  srp527w (  1.525 ms  1.658 ms  2.282 ms

 2  * * *

 3 (  11.752 ms  701.852 ms  247.512 ms

 4 (  52.843 ms  10.988 ms  10.686 ms

 5 (  24.756 ms  23.754 ms  22.853 ms

 6 (  20.284 ms  1796.876 ms  221.324 ms

 7 (  33.305 ms  2256.862 ms  2622.872 ms

 8 (  1227.799 ms  22.171 ms (  22.397 ms

 9 (  30.855 ms (  34.917 ms (  32.279 ms

10 (  93.158 ms (  33.869 ms  55.004 ms

11  * * *

12  * * *

13  * * *

14  * * *

15  * * *

16  * * *


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