Data rates

I use BT Broadband at a data rate of 2 Mbits/sec.

I am located 400 metres from the telephone exchange. I would like to
know the approximate maximum data rate which my phone line could
support if given the opportunity.

It is well known, maximum possible data rates depend strongly on
length of line.

Is there a way of estimating maximum possible data rate just from a
knowledge of line length without having to pester the service provider
to go to the trouble of measuring it.
----
Reg.

"Reg Edwards" <(E-Mail Removed)> wrote in message
news:dl5s6f$9ed$(E-Mail Removed)...
>I use BT Broadband at a data rate of 2 Mbits/sec.
>
> I am located 400 metres from the telephone exchange. I would like to
> know the approximate maximum data rate which my phone line could
> support if given the opportunity.
>
> It is well known, maximum possible data rates depend strongly on
> length of line.
>
> Is there a way of estimating maximum possible data rate just from a
> knowledge of line length without having to pester the service provider
> to go to the trouble of measuring it.
> ----
> Reg.
>
>
At only 400m away then it would be as fast as you can take it! How bout
8-10MB?
It would then come down to the quality of the lines within your property.
I doubt anyone will provide such a fast service and it's pointless using it
for file shares as the speed of downloads depends on how fast people can
upload.

> I am located 400 metres from the telephone exchange. I would like to
> know the approximate maximum data rate which my phone line could
> support if given the opportunity.

You might be 400m from the exchange. That does not mean automatically that
your wires are only 400m long. Do you know your on that exchange ?.

Dave

dave stanton wrote:
>> I am located 400 metres from the telephone exchange. I would like to
>> know the approximate maximum data rate which my phone line could
>> support if given the opportunity.
>
> You might be 400m from the exchange. That does not mean automatically
> that your wires are only 400m long. Do you know your on that exchange
> ?.
>
Have an area close to me where even though they are marginally further
away they can't get anything better than 512k.

It's not just the line length which counts, it's also what the line is
made of & what the quality is like (numbers of joints, aluminium v
copper, what the thickness of the pairs are etc).

Have you done a line test to check its exact length.

Didn't someone launch 24MB uk wide last week?

(E-Mail Removed) wrote:
> Have you done a line test to check its exact length.
>
> Didn't someone launch 24MB uk wide last week?

Make that an, up to 24Mb service...

On 13 Nov 2005 02:49, "mark" <(E-Mail Removed)> wrote:

>It would then come down to the quality of the lines within your property.

If he has some figures from a router it might help take out much of the
guesswork.... After all, the line outside his property has a bit more
bearing on whether there's enough of a signal reaching him to be used

Peter M wrote:
> On 13 Nov 2005 02:49, "mark" <(E-Mail Removed)> wrote:
>
>> It would then come down to the quality of the lines within your
>> property.
>
> If he has some figures from a router it might help take out much of
> the guesswork.... After all, the line outside his property has a bit
> more bearing on whether there's enough of a signal reaching him to be
> used

But wouldn't have much if any bearing on how 'clean' the signal is...

> I use BT Broadband at a data rate of 2 Mbits/sec.
>
> I am located 400 metres from the telephone exchange. I would like to
> know the approximate maximum data rate which my phone line could
> support if given the opportunity.

Does your router / ADSL modem display line stats?

If so, look at the SNR (sometimes called "Noise margin"). Basically, this
has to remain above about 10 dB for the line to work. Each time you double
the speed it reduces the SNR by about 7-8 dB.

So if you currently had an SNR of 20, you should be able to get 4 Mbit in
theory.

On 13 Nov 2005 05:07:13 -0800, (E-Mail Removed) wrote:

>Didn't someone launch 24MB uk wide last week?

"uk wide" in marketing speak ie on a modest number of exchanges in
cities and perhaps the odd big town. It was UKOnline, and I think they
were calling it 22M to avoid people like me saying that nobody will
actually connect at 24M.

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.