ADSL slow after line fault?

This is possibly a silly question, but...

ADSL MAX, from freedom2surf, usually connects at around 7800/448kbps,
SNR margin 7.0dB, Attenuation 34.0dB

A couple of days ago, a fault developed on the line: much hissing and
crackling on the phone, and the ADSL frequently losing sync, with the
speed dropping as low as 192/288 with the margin and attenuation all
over the place.

Engineer came this morning, switched the line to a spare pair on the
pole, and cleared a partial short to an adjacent line in the cabinet at
the end of the street. Phone is now crystal clear, and the ADSL is
connecting at 7800-8000/448kbps, again with 7dB margin and 34dB
attenuation. Problem solved?

Except that I don't seem to be able to download from anywhere at more
than about 16k/s. Ping times are good, when the link isn't saturated
with a download.

Could this be some sort of rate-adaptive behaviour that's become
confused by a few days of crappy line quality, and if so, do I just wait
for it to sort itself out (and if so, how long is that likely to take)?

There's nothing amiss on the f2s status page, and I've had another f2s
customer confirm their connection is working perfectly, so it's probably
not an upstream fault.


Thanks in advance,


Kim.

kimble wrote:
> This is possibly a silly question, but...
>
> ADSL MAX, from freedom2surf, usually connects at around
> 7800/448kbps, SNR margin 7.0dB, Attenuation 34.0dB
>
> A couple of days ago, a fault developed on the line: much hissing
> and crackling on the phone, and the ADSL frequently losing sync,
> with the speed dropping as low as 192/288 with the margin and
> attenuation all over the place.
>
> Engineer came this morning, switched the line to a spare pair on the
> pole, and cleared a partial short to an adjacent line in the
> cabinet at the end of the street. Phone is now crystal clear, and
> the ADSL is connecting at 7800-8000/448kbps, again with 7dB margin
> and 34dB attenuation. Problem solved?
>
> Except that I don't seem to be able to download from anywhere at
> more than about 16k/s. Ping times are good, when the link isn't
> saturated with a download.
>
> Could this be some sort of rate-adaptive behaviour that's become
> confused by a few days of crappy line quality, and if so, do I just
> wait for it to sort itself out (and if so, how long is that likely
> to take)?
> There's nothing amiss on the f2s status page, and I've had another
> f2s customer confirm their connection is working perfectly, so it's
> probably not an upstream fault.
>
>
> Thanks in advance,
>
>
> Kim.

The fault could have made the DSLAM drop your speeds, give it a few
days (it's officially 3-4 days so make it a week) if it's not up to
anything like your normal speeds then fire a query of to your ISP.
Remember just because a pair isn't noisy & dosesn't have electrical
faults on it may not be optimal for ADSL.

The best thing to do is forget about it until next Friday & see what
it is like then.

kimble wrote:

> This is possibly a silly question, but...
>
> ADSL MAX, from freedom2surf, usually connects at around 7800/448kbps,
> SNR margin 7.0dB, Attenuation 34.0dB
>
> A couple of days ago, a fault developed on the line: much hissing and
> crackling on the phone, and the ADSL frequently losing sync, with the
> speed dropping as low as 192/288 with the margin and attenuation all
> over the place.
>
> Engineer came this morning, switched the line to a spare pair on the
> pole, and cleared a partial short to an adjacent line in the cabinet at
> the end of the street. Phone is now crystal clear, and the ADSL is
> connecting at 7800-8000/448kbps, again with 7dB margin and 34dB
> attenuation. Problem solved?
>
> Except that I don't seem to be able to download from anywhere at more
> than about 16k/s. Ping times are good, when the link isn't saturated
> with a download.
>
> Could this be some sort of rate-adaptive behaviour that's become
> confused by a few days of crappy line quality, and if so, do I just wait
> for it to sort itself out (and if so, how long is that likely to take)?
>
> There's nothing amiss on the f2s status page, and I've had another f2s
> customer confirm their connection is working perfectly, so it's probably
> not an upstream fault.

If it was down to rate adaption, I'd expect that to be reflected by the sync
speed. That's certainly been my experience. But that doesn't seem to be the case
here.

A long shot. It's just possible the card in the DSLAM needs to be reset. That
cured a slowdown I was once suffering. You'll need to get f2s to persuade BT to
do that.

Graham

On Sep 21, 8:21 pm, kimble <m...@privacy.net> wrote:

> Engineer came this morning, switched the line to a spare pair on the
> pole, and cleared a partial short to an adjacent line in the cabinet at
> the end of the street. Phone is now crystal clear, and the ADSL is
> connecting at 7800-8000/448kbps, again with 7dB margin and 34dB
> attenuation. Problem solved?
>
> Except that I don't seem to be able to download from anywhere at more
> than about 16k/s. Ping times are good, when the link isn't saturated
> with a download.

your IP profile may take ~3 days to recover in response to the new
synch speed. speedtester.bt.com eventually reveals the current IP
profile as well as your synch speed.

Phil

PhilT wrote:
>> Except that I don't seem to be able to download from anywhere at more
>> than about 16k/s. Ping times are good, when the link isn't saturated
>> with a download.
>
> your IP profile may take ~3 days to recover in response to the new
> synch speed. speedtester.bt.com eventually reveals the current IP
> profile as well as your synch speed.

Not checked with speedtester yet, but the line seems to be performing
normally again (I just got 520kB/s on a download from mirrorservice.org)
as of this evening.


Kim.