ADSL and Line Noise

I have had my bt phone line for nearly six years and just this weekend
i noticed slight line noise when i listen to the dialling tone which i
have never had before. I dialled up to my isp earlier yesterday and
got a connection speed of 27,000 bps so i disconnected and tried again
later. I heard slight line noise again this morning but it is only
intermittent and i have gone back to connected at either 49,000 bps or
50,000 bps.

As i'am considering getting broadband soon i would like to know if i
signed up for adsl would my line fail the noise test because of this
slight occasional line noise or is there some sort of tolerence
regarding testing a line's suitability for adsl?

And one more thing if it did fail the line noise test how would i go
about getting adsl? I'am considering plusnet as an broadband isp, but
if it was too much hassle i would consider telewest broadband instead.

Thanks in advance.

du.

<(E-Mail Removed)> wrote in message

> would my line fail the noise test because of this
> slight occasional line noise

First thing to do is to try to get the noise problem fixed. Ring BT faults
and tell them you have line noise.

Jc.

On 27 Jun 2004, in uk.telecom.broadband, (E-Mail Removed) wrote:

> because of this slight occasional line noise or is there some
> sort of tolerence regarding testing a line's suitability for adsl?

I've had sometimes major line noise on the line I've had for over a
dozen years. When I was getting a line converted to Home Highway in
2001 I hoped they would use that one, alas they used another (both on
the same number, prior to the conversion). I have had ADSL working on
this 'noissy' line for well over a year with PlusNet on a 500 kbps a/c
so I don't think you are likely to have big problems especially as it
is "slight" and "occasional". PlusNet support can be reached on an
0845 number if you ever need them for details of what happened if an
ADSL request fails but the setup process is tracked and details are
on their web portal so you will know within 2-3 days (even if you
ordered on a Sunday) if the line had been provisionally passed as
being usable). If you want higher speeds or are further away from
the exchange there's a slightly raised chance of problems. Peter M.

On Sun, 27 Jun 2004 08:49:45 +0000 (UTC), (E-Mail Removed) wrote:

>And one more thing if it did fail the line noise test how would i go
>about getting adsl?

BT do not test for line noise before enabling ADSL. In fact they don't
test for anything in the majority of cases, only measuring the line
loss (attenuation) in very marginal cases or where a customer or ISP
kicks up enough fuss. Noise is not measured.

If your line is on the database as "Green" the order just gets
implemented, no tests its all automatic.

Also you can't hear ADSL so your noise is in the wrong spectrum to
affect it in practice.

Phil
--
spamcop.net address commissioned 18/06/04
Come on down !

>
> Also you can't hear ADSL so your noise is in the wrong spectrum to
> affect it in practice.
>
> Phil
> --
>

Noise by definition is random. Just because you can hear it, it doesn't
preclude there being appreciable energy above audio frequencies.
Telephone line noise is usually caused by a lose/oxidised screw/Krone
connection and will cause just this kind of wideband noise.

If you want another illustration, try this
Telephone engineers carry a device for identifying pairs. You connect the
pair under test to a box that generates a 1Khz tone, you can certainly hear
that. But the point is that the tone is a square wave with a fast rise and
fall time so harmonics are produced extending to Mhz's so when looking for
the signal at the far end he only has to hold his receiver near to the pair
to hear the tone.

On Sun, 27 Jun 2004 13:22:18 +0100, "Graham" <(E-Mail Removed)> wrote:

>Noise by definition is random. Just because you can hear it, it doesn't
>preclude there being appreciable energy above audio frequencies.

indeed, nor does it guarantee it. The key point is that it will not
affect the provision of ADSL as it is not measured. It may affect the
performance of it once you have it, but that's a different thing.

Phil
--
spamcop.net address commissioned 18/06/04
Come on down !