Wierd ADSL problem

Hello -

I've just signed up with Demon for ADSL over a BT line. Demon Tech Support
aren't answering the phone at present, so here's my problem:

I get a very poor downstream SNR, usually less than 3, frequently negative,
and the connection is dropped frequently.

The wierd thing is that when I make a voice call the SNR magically rises to
about 14 and the ADSL works fine, although the voice line is a bit noisy. As
soon as the voice call ends, the ADSL is rubbish again.

Is there a likely solution for this? Thanks (more details below)

The router (Zoom X3) is plugged into a microfilter, and the microfilter is
plugged directly into the master socket. I've tried diferent microfilters.
The router works fine at another property with an ADSL line. The upstream
SNR is generally >10, the downstream attenuation about 40, and the upstream
attenuation about 25. There's no obvious damage between the master socket
and where the cable goes into the ground

BristolRenter wrote:
> Hello -
>
> I've just signed up with Demon for ADSL over a BT line. Demon Tech Support
> aren't answering the phone at present, so here's my problem:
>
> I get a very poor downstream SNR, usually less than 3, frequently negative,
> and the connection is dropped frequently.
>
> The wierd thing is that when I make a voice call the SNR magically rises to
> about 14 and the ADSL works fine, although the voice line is a bit noisy. As
> soon as the voice call ends, the ADSL is rubbish again.
>
> Is there a likely solution for this? Thanks (more details below)
>
> The router (Zoom X3) is plugged into a microfilter, and the microfilter is
> plugged directly into the master socket. I've tried diferent microfilters.
> The router works fine at another property with an ADSL line. The upstream
> SNR is generally >10, the downstream attenuation about 40, and the upstream
> attenuation about 25. There's no obvious damage between the master socket
> and where the cable goes into the ground
>
>

try without any microfilters and unplug everything else from the phone
line. see what the snr is. if its ok, then that batch of filters could
be crappy. I know you've tried several filters, but they could all be
rubbish and at least this will really eliminate them

In an earlier contribution to this discussion,
BristolRenter <(E-Mail Removed)> wrote:

> Hello -
>
> I've just signed up with Demon for ADSL over a BT line. Demon Tech
> Support aren't answering the phone at present, so here's my problem:
>
> I get a very poor downstream SNR, usually less than 3, frequently
> negative, and the connection is dropped frequently.
>
> The wierd thing is that when I make a voice call the SNR magically
> rises to about 14 and the ADSL works fine, although the voice line is
> a bit noisy. As soon as the voice call ends, the ADSL is rubbish
> again.
> Is there a likely solution for this? Thanks (more details below)
>
> The router (Zoom X3) is plugged into a microfilter, and the
> microfilter is plugged directly into the master socket. I've tried
> diferent microfilters. The router works fine at another property with
> an ADSL line. The upstream SNR is generally >10, the downstream
> attenuation about 40, and the upstream attenuation about 25. There's
> no obvious damage between the master socket and where the cable goes
> into the ground

It sounds like one of those cases of a bad connection somewhere between your
house and the exchange - where the extra current required for the voice call
'wets' it, and makes ADSL work, too.

You'll have to get Demon to get BT to check the line.
--
Cheers,
Tim
______
Please reply to newsgroup. Reply address is invalid.

On Sat, 21 Jan 2006 17:27:52 -0000, "BristolRenter"
<(E-Mail Removed)> wrote:

>The wierd thing is that when I make a voice call the SNR magically rises to
>about 14 and the ADSL works fine, although the voice line is a bit noisy. As
>soon as the voice call ends, the ADSL is rubbish again.

report a voice fault to 151 or via bt.com if its noisy. The symptoms
are those of a high resistance joint fault / cable break so it needs
BT to fix it.

As its audible 151 can help, if it isn't then Demon need to ask BT for
help with an ADSL problem.

Phil
--
Tiscali - dialup speeds at Broadband prices, see
http://bbs.adslguide.org.uk/postlist...&Board=tiscali

AOL - the unlimited ISP of choice for heavy downloaders.

Tiscali Tim used his keyboard to write :
> It sounds like one of those cases of a bad connection somewhere between your
> house and the exchange - where the extra current required for the voice call
> 'wets' it, and makes ADSL work, too.

I would second that diagnosis.

Try the modem plugged directly into the line with no filter and if you
still have a problem the cause is most likely a problem on your line to
the exchange or at the exchange itself. Otherwise your problem is
internal/or an extension.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

"Harry Bloomfield" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> Tiscali Tim used his keyboard to write :
>> It sounds like one of those cases of a bad connection somewhere
>> between your house and the exchange - where the extra current
>> required for the voice call 'wets' it, and makes ADSL work, too.
>
> I would second that diagnosis.
>
> Try the modem plugged directly into the line with no filter and if
> you still have a problem the cause is most likely a problem on your
> line to the exchange or at the exchange itself. Otherwise your
> problem is internal/or an extension.

Disconnect the faceplate & test from thair & then you'll know whether
it's your extensions (BT chargable) or the network (BT not chargable)