Will SNR change with connection speed

I've just been upgraded from 512K to 1Mb, every thing works fine except I
have noticed my SNR reading have changed

On 512K I had the following readings
Line Attenuation 53 db 31.5 db
Noise Margin 28 db 29 db

I now have these

Line Attenuation 53 db 31.5 db
Noise Margin 18 db 29 db

Is this to be expected or have BT moved me to a noisier connection ?

Thanks

Furby wrote:
> I've just been upgraded from 512K to 1Mb, every thing works fine
> except I have noticed my SNR reading have changed
>
> On 512K I had the following readings
> Line Attenuation 53 db 31.5 db
> Noise Margin 28 db 29 db
>
> I now have these
>
> Line Attenuation 53 db 31.5 db
> Noise Margin 18 db 29 db
>
> Is this to be expected or have BT moved me to a noisier connection ?
>
> Thanks

Simple answer is yes...

snr is not constant, with the readings from your modem, only a whoosh test
produces accurate readings
"kraftee" <kraftee@spamoff& die.com> wrote in message
news:4233ee42$0$30588$(E-Mail Removed)...
> Furby wrote:
>> I've just been upgraded from 512K to 1Mb, every thing works fine
>> except I have noticed my SNR reading have changed
>>
>> On 512K I had the following readings
>> Line Attenuation 53 db 31.5 db
>> Noise Margin 28 db 29 db
>>
>> I now have these
>>
>> Line Attenuation 53 db 31.5 db
>> Noise Margin 18 db 29 db
>>
>> Is this to be expected or have BT moved me to a noisier connection ?
>>
>> Thanks
>
> Simple answer is yes...
>

The noise level on your line is a fixed quantity depending on line quality.

The signal-to-noise level can change only if the signal level and/or line
itself is changed.

If everything is working OK then count your blessings and don't try to fix
it.

==================================

"Furby" <(E-Mail Removed)> wrote in message
news:4233eb4b$0$10946$(E-Mail Removed)...
> I've just been upgraded from 512K to 1Mb, every thing works fine except I
> have noticed my SNR reading have changed
>
> On 512K I had the following readings
> Line Attenuation 53 db 31.5 db
> Noise Margin 28 db 29 db
>
> I now have these
>
> Line Attenuation 53 db 31.5 db
> Noise Margin 18 db 29 db
>
> Is this to be expected or have BT moved me to a noisier connection ?
>
> Thanks
>
>

Marky wrote:
> snr is not constant, with the readings from your modem, only a whoosh
> test produces accurate readings

Read the question...........
> "kraftee" <kraftee@spamoff& die.com> wrote in message
> news:4233ee42$0$30588$(E-Mail Removed)...
>> Furby wrote:
>>> I've just been upgraded from 512K to 1Mb, every thing works fine
>>> except I have noticed my SNR reading have changed
>>>
>>> On 512K I had the following readings
>>> Line Attenuation 53 db 31.5 db
>>> Noise Margin 28 db 29 db
>>>
>>> I now have these
>>>
>>> Line Attenuation 53 db 31.5 db
>>> Noise Margin 18 db 29 db
>>>
>>> Is this to be expected or have BT moved me to a noisier connection ?
>>>
>>> Thanks
>>
>> Simple answer is yes...

> I've just been upgraded from 512K to 1Mb, every thing works fine except I
> have noticed my SNR reading have changed

Every time you double the connection speed, the SNR drops by about 10 dB.
You need a SNR of at least 12 dB to have a working ADSL connection --
therefore, that shows that you're fine for 1 Mb, but your line isn't good
enough to be upgraded to 2 Mb.

"Chris Jones" <(E-Mail Removed)> wrote in message
news:42345174$0$544$(E-Mail Removed)...
> > I've just been upgraded from 512K to 1Mb, every thing works fine except
I
> > have noticed my SNR reading have changed
>
> Every time you double the connection speed, the SNR drops by about 10 dB.
> You need a SNR of at least 12 dB to have a working ADSL connection --
> therefore, that shows that you're fine for 1 Mb, but your line isn't good
> enough to be upgraded to 2 Mb.
>
>
unfortunately I know my line will not be able to support 2Mb, how ever, how
will this work with 8Mb dsl and the new adsl2+ experiments, I can see only
very few homes able to have such high speeds .

Also with the new adsl2+ will i be able to get higher speeds and if so how
high ? and when

> unfortunately I know my line will not be able to support 2Mb, how ever,
> how will this work with 8Mb dsl and the new adsl2+ experiments, I can
> see only very few homes able to have such high speeds .
>
> Also with the new adsl2+ will i be able to get higher speeds and if so how
> high ? and when

Although the limits haven't been set yet, it's likely that you won't be able
to get 4/8 Mb unless you can already get 2 Mb with a decent SNR.

ADSL2+ does two things:
1) extends the reach of 512 kbs to work on very long lines
2) allows some people who can already get 2 Mb to get speeds up to 18 Mb.

ADSL2+ will do nothing for people who already have a 0.5 or 1 Mb connection
but don't have a good enough line to get 2 Mb.

"Chris Jones" <(E-Mail Removed)> wrote in message
news:42346fd0$0$23945$(E-Mail Removed)...
> > unfortunately I know my line will not be able to support 2Mb, how ever,
> > how will this work with 8Mb dsl and the new adsl2+ experiments, I can
> > see only very few homes able to have such high speeds .
> >
> > Also with the new adsl2+ will i be able to get higher speeds and if so
how
> > high ? and when
>
> Although the limits haven't been set yet, it's likely that you won't be
able
> to get 4/8 Mb unless you can already get 2 Mb with a decent SNR.
>
> ADSL2+ does two things:
> 1) extends the reach of 512 kbs to work on very long lines
> 2) allows some people who can already get 2 Mb to get speeds up to 18 Mb.
>
> ADSL2+ will do nothing for people who already have a 0.5 or 1 Mb
connection
> but don't have a good enough line to get 2 Mb.
>
>

So what use is adsl2+

If you cant get any bb you will able to get 512K that's about 3% of the
population.

For those in the 2Mb group its great , but what about the majority who are
on 512K or 1Mb lines
something you said just does not add up. Where will BT get their profits
from , those lucky few with high bandwidth connections? sorry that does not
make good business sense.
I have heard a lot of talk about DSLAMS being put in the local street boxes,
is this now not happening ? I thought that was BT way of getting people on
to the higher bandwidths ? I.e. if you can't get to the exchange they will
bring the exchange to you.

In article <42348c7f$0$10951$(E-Mail Removed)>,
(E-Mail Removed) (Furby) wrote:

> If you cant get any bb you will able to get 512K that's about 3% of the
> population.

That's 1.5 million people...

--
Paul Cummins, Always a NetHead
Wasting Bandwidth since 1981