line levels

I'm thinking of moving to faster broadband, but have no idea what speed
my line can handle (Currently 512k). I have the line level stats from
my router (SNR/power etc) but have no idea of what speeds my line might
support. I've googled around for the information, but it's not clear.
Can anyone suggest speeds and the corresponding max/minimum line levels
that are required? I don't have the line levels to post, as I'm not
currently at home....TIA

Case closed - A bit more digging and I found this :-

http://www.kitz.co.uk/adsl/linestats.htm

Attenuation :

0-42dB = 2Mbps
43-60dB = 1Mbps
> 60dB = 512kbps

Does anyone have values for faster speeds?

In article <(E-Mail Removed). com>,
(E-Mail Removed) says...

>
> Does anyone have values for faster speeds?
>

Faster speeds will generally be rate adaptive based on your SNR and a
line that can obtain 2Mbit alreay (so less than 43dB attenuation).
Generally speaking the lower the attenuation the greater the chance of
you getting a faster speed but there are no published values (unless
somoene from UK Online or Bulldog would like to chip in...)

I'd say if you had 2Mbit, with an attenuation of say 40dB and an SNR of
20dB you'd be good for 5 MBit or maybe more.

Alex

On 27 Sep 2005 06:23:44 -0700, "tangerine_sedge"
<(E-Mail Removed)> wrote:

>but have no idea what speed
>my line can handle

that's what www.bt.com/broadband is for
plug your numbe rin and it'll tell you what's on offer from BT
provided ISPs

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.

tangerine_sedge wrote:
>
> Case closed - A bit more digging and I found this :-
>
> http://www.kitz.co.uk/adsl/linestats.htm
>
> Attenuation :
>
> 0-42dB = 2Mbps
> 43-60dB = 1Mbps
> > 60dB = 512kbps
>
> Does anyone have values for faster speeds?

I don't think it is so simple, as the variation in noise between lines
is also significant. Same atten, different noise. That table is making
some assumptions about 'averagely poor' noise on a line to relate atten
to SNR.
SNR is what matters as your router/modem will tend to give up when SNR <
6dB or SNRM = 0dB. Each doubling of speed loses about 3 - 6dB of SNR (or
SNRM).

Bill <(E-Mail Removed)> wrote:

: I don't think it is so simple, as the variation in noise between lines
: is also significant. Same atten, different noise. That table is making
: some assumptions about 'averagely poor' noise on a line to relate atten
: to SNR.

But this, in the real world, *DOES* matter! BT's line checker can estimate
attenuation but not SNR. Almost all ISPs now will upgrade (or will refuse to!!)
based on the line checker's output.