SNR re-set

Query please...
..
Does getting a MAC and changing to a different ISP reset the SNR
on your line.. or will it remain as it is with your present one.
Mine at the moment is 15db + . I'm in two minds to change anyway
and this may tip the balance.
If so, what does it get set to. ?
..
Thanks

> Does getting a MAC and changing to a different ISP reset the SNR
> on your line.. or will it remain as it is with your present one.
> Mine at the moment is 15db + . I'm in two minds to change anyway
> and this may tip the balance.
> If so, what does it get set to. ?

The SNR is not set as such. It is simply a scientific measurement of one of
the physical characteristics of the line between your house and the BT
exchange. It has nothing to do with what ISP you use. Perhaps you need to
read up on ADSL to enable you to make a decision based on facts rather than
opinion.

Peter Crosland

On 29 Sep 2006, "Peter Crosland" <(E-Mail Removed)> wrote:

>> Does getting a MAC and changing to a different ISP reset the SNR
>> on your line.. or will it remain as it is with your present one.
>> Mine at the moment is 15db + . I'm in two minds to change anyway
>> and this may tip the balance.
>> If so, what does it get set to. ?
>
>The SNR is not set as such. It is simply a scientific measurement of one of
>the physical characteristics of the line between your house and the BT
>exchange.

If you look at various postings elsewhere, you'll see that the SNR minimum
can be set, via the ISP/network provider, well above the 'default' 6 db on
DSL Max.

>It has nothing to do with what ISP you use.

Bzzzt! Possibly it *can*. Have you not seen comments about asking the ISP
to increase the setting? While I'm sure your comments are well-meaning it
seems to me this poster might have had the setting pushed up (to give him
a more stable connection)... Since the posting was from PlusNet there is
a chance the user is on an LLU connection (which makes getting, or rather
*using* a MAC much less easy), and might therefore be connected using
Tiscali's network. We need more information really to be sure. If this
user has been connected over a Tiscali connection, then switching ISP to
one using BT Wholesale might well be an option which *would* have some
effect on the SNR setting needed for a DSL Max connection. Whether this
user will see benefits or not is open to question, of course.

>Perhaps you need to read up on ADSL to enable you to make a decision
>based on facts rather than opinion.

Pot, kettle, black. Maybe you need to do some more reading, too. I do
not know whether the site by 'kitz' includes such info, but it would be one
of the places I'd expect to give a mention to SNR.

--
Change to DSL Max the way I did: switch ISP <http://www.dslmax.info/>

"NoNeedToKnow" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed)...
> On 29 Sep 2006, "Peter Crosland" <(E-Mail Removed)> wrote:
>
>>> Does getting a MAC and changing to a different ISP reset the SNR
>>> on your line.. or will it remain as it is with your present one.
>>> Mine at the moment is 15db + . I'm in two minds to change anyway
>>> and this may tip the balance.
>>> If so, what does it get set to. ?
>>
>>The SNR is not set as such. It is simply a scientific measurement of one
>>of
>>the physical characteristics of the line between your house and the BT
>>exchange.
>
> If you look at various postings elsewhere, you'll see that the SNR minimum
> can be set, via the ISP/network provider, well above the 'default' 6 db on
> DSL Max.
>
>>It has nothing to do with what ISP you use.
>
> Bzzzt! Possibly it *can*. Have you not seen comments about asking the ISP
> to increase the setting? While I'm sure your comments are well-meaning it
> seems to me this poster might have had the setting pushed up (to give him
> a more stable connection)... Since the posting was from PlusNet there is
> a chance the user is on an LLU connection (which makes getting, or rather
> *using* a MAC much less easy), and might therefore be connected using
> Tiscali's network. We need more information really to be sure. If this
> user has been connected over a Tiscali connection, then switching ISP to
> one using BT Wholesale might well be an option which *would* have some
> effect on the SNR setting needed for a DSL Max connection. Whether this
> user will see benefits or not is open to question, of course.
>
>>Perhaps you need to read up on ADSL to enable you to make a decision
>>based on facts rather than opinion.
>
> Pot, kettle, black. Maybe you need to do some more reading, too. I do
> not know whether the site by 'kitz' includes such info, but it would be
> one
> of the places I'd expect to give a mention to SNR.
>
> --
> Change to DSL Max the way I did: switch ISP <http://www.dslmax.info/>


Thanks for decent reply..
..
The problem is that I've had a bit of bother with my router and
as a consequence its had far too many re-boots along with
living in the sticks with sometimes frequent power cuts. I have been trying
to get a higher sync to give me better D/Ls its pushed the SNR way
beyond the 15 mark. My own fault I know.
Have had it continually connected for 17 days with only a reduction
to 14.5db at certain times.
I'm going to purchase a new router tomorrow and would have liked
the SNR to start at 6 again.
I'm not LLU'd. Perhaps I may ask Plusnet to re-train my line,
although I don't hold much hope on that one.
..
regards
Alan

On 29 Sep 2006 11:34, "Alan" <(E-Mail Removed)> wrote:

>I'm not LLU'd.

In a small way, that's a shame (insofar as a switch to BTW may have got
you what you are after, IYSWIM :-)

>I may ask Plusnet to re-train my line, although I don't hold much hope ...

You can but ask - I'd suggest using the 'ticket' system and (depending on
the response) following up at http://usergroup.plus.net/ as the staff do
seem to be quite helpful (certainly I've no complaints about staff I have
come across via web discussions and newsgroups).

>>>> Does getting a MAC and changing to a different ISP reset the SNR
>>>> on your line.. or will it remain as it is with your present one.
>>>> Mine at the moment is 15db + . I'm in two minds to change anyway
>>>> and this may tip the balance.
>>>> If so, what does it get set to. ?
>>>
>>> The SNR is not set as such. It is simply a scientific measurement
>>> of one of
>>> the physical characteristics of the line between your house and the
>>> BT exchange.
>>
>> If you look at various postings elsewhere, you'll see that the SNR
>> minimum can be set, via the ISP/network provider, well above the
>> 'default' 6 db on DSL Max.

Agreed but very unusual and the OP did not say that his had been altered.

>>
>>> It has nothing to do with what ISP you use.

>>
>> Bzzzt! Possibly it *can*. Have you not seen comments about asking
>> the ISP to increase the setting? While I'm sure your comments are
>> well-meaning it seems to me this poster might have had the setting
>> pushed up (to give him a more stable connection)... Since the
>> posting was from PlusNet there is a chance the user is on an LLU
>> connection (which makes getting, or rather *using* a MAC much less
>> easy), and might therefore be connected using Tiscali's network. We
>> need more information really to be sure. If this user has been
>> connected over a Tiscali connection, then switching ISP to one using
>> BT Wholesale might well be an option which *would* have some effect
>> on the SNR setting needed for a DSL Max connection. Whether this
>> user will see benefits or not is open to question, of course.

If the OP has asked for a MAC code then is it not a reasonable assumption he
is not on LLU?

>>> Perhaps you need to read up on ADSL to enable you to make a decision
>>> based on facts rather than opinion.

>> Pot, kettle, black. Maybe you need to do some more reading, too. I
>> do not know whether the site by 'kitz' includes such info, but it
>> would be one
>> of the places I'd expect to give a mention to SNR.

A little harsh but I take your point.


>> Change to DSL Max the way I did: switch ISP <http://www.dslmax.info/>
..
> The problem is that I've had a bit of bother with my router and
> as a consequence its had far too many re-boots along with
> living in the sticks with sometimes frequent power cuts. I have been
> trying to get a higher sync to give me better D/Ls its pushed the SNR
> way beyond the 15 mark. My own fault I know.
> Have had it continually connected for 17 days with only a reduction
> to 14.5db at certain times.
> I'm going to purchase a new router tomorrow and would have liked
> the SNR to start at 6 again.
> I'm not LLU'd. Perhaps I may ask Plusnet to re-train my line,
> although I don't hold much hope on that one.
> .
> regards
> Alan

--
Peter Crosland

:-)
>
>>I may ask Plusnet to re-train my line, although I don't hold much hope ...
>
> You can but ask - I'd suggest using the 'ticket' system and (depending on
> the response) following up at http://usergroup.plus.net/ as the staff do
> seem to be quite helpful (certainly I've no complaints about staff I have
> come across via web discussions and newsgroups).
..
Thanks again.
I'll initially put a ticket and await the response.
..
Alan

On 29 Sep 2006 17:40, "Peter Crosland" <(E-Mail Removed)> wrote:

>If the OP has asked for a MAC code then is it not a reasonable assumption
>he is not on LLU?

No, because you may well know that a trial of issuing a MAC for transfer
from LLU to BTW was due to start around the end of June. Not many ISPs
currently accept these MACs but they do exist, so cannot 'assume' now.

Alan wrote:
> "NoNeedToKnow" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed)...
>> On 29 Sep 2006, "Peter Crosland" <(E-Mail Removed)> wrote:
>>
>>>> Does getting a MAC and changing to a different ISP reset the SNR
>>>> on your line.. or will it remain as it is with your present one.
>>>> Mine at the moment is 15db + . I'm in two minds to change anyway
>>>> and this may tip the balance.
>>>> If so, what does it get set to. ?
>>>
>>> The SNR is not set as such. It is simply a scientific measurement
>>> of one of
>>> the physical characteristics of the line between your house and the
>>> BT exchange.
>>
>> If you look at various postings elsewhere, you'll see that the SNR
>> minimum can be set, via the ISP/network provider, well above the
>> 'default' 6 db on DSL Max.
>>
>>> It has nothing to do with what ISP you use.
>>
>> Bzzzt! Possibly it *can*. Have you not seen comments about asking
>> the ISP to increase the setting? While I'm sure your comments are
>> well-meaning it seems to me this poster might have had the setting
>> pushed up (to give him a more stable connection)... Since the
>> posting was from PlusNet there is a chance the user is on an LLU
>> connection (which makes getting, or rather *using* a MAC much less
>> easy), and might therefore be connected using Tiscali's network. We
>> need more information really to be sure. If this user has been
>> connected over a Tiscali connection, then switching ISP to one using
>> BT Wholesale might well be an option which *would* have some effect
>> on the SNR setting needed for a DSL Max connection. Whether this
>> user will see benefits or not is open to question, of course.
>>> Perhaps you need to read up on ADSL to enable you to make a decision
>>> based on facts rather than opinion.
>>
>> Pot, kettle, black. Maybe you need to do some more reading, too. I
>> do not know whether the site by 'kitz' includes such info, but it
>> would be one
>> of the places I'd expect to give a mention to SNR.
>>
>> --
>> Change to DSL Max the way I did: switch ISP <http://www.dslmax.info/>
>
>
> Thanks for decent reply..
> .
> The problem is that I've had a bit of bother with my router and
> as a consequence its had far too many re-boots along with
> living in the sticks with sometimes frequent power cuts. I have been
> trying to get a higher sync to give me better D/Ls its pushed the SNR
> way beyond the 15 mark. My own fault I know.
> Have had it continually connected for 17 days with only a reduction
> to 14.5db at certain times.
> I'm going to purchase a new router tomorrow and would have liked
> the SNR to start at 6 again.
> I'm not LLU'd. Perhaps I may ask Plusnet to re-train my line,
> although I don't hold much hope on that one.

Hmmm, a SNR of 15 dB is very much better (like 4 times better) than a SNR of
6 dB. 6 dB is generally considered to be the very lowest SNR acceptable for
an ADSL service to function. You need as much signal as you can get with as
little noise as possible, hence the higher the SNR the better.

All measurements have some tolerance, and I think the SNR as given by a
router is not particularly accurate, so changing the router may indeed give
a different figure, either higher or lower. It will not change the actual
SNR of the line however.

There are three ways in which the SNR might be improved:

1. Increase the signal applied to the line. Whilst this is obviously
theoretically possible I am not sure that it is easy for BT to do, or if BT
would even consider doing it.

2. Reduce the resistance of the line to enable more of the signal to reach
your end - shorten the distance or change the material, a silver line might
help. Not really very practical unless there are pairs in the "green box"
that take a shorter route from the exchange, so unlikely to be attempted by
BT.

3. Reduce the noise generated by the line - improve joints. BT may attempt
this if you have voice faults caused by poor joints or if your ADSL problems
are severe and also caused by poor joints.

From that I think you should assume that Peter's response was right.

--
Old Codger
e-mail use reply to field

What matters in politics is not what happens, but what you can make people
believe has happened. [Janet Daley 27/8/2003]

Old Codger:
>There are three ways in which the SNR might be improved:

Well, all of them are in the hands of BT :-(

But there is one think that may be worth trying:

Replace router with ADSL2/2+ type.
Zyxel 2602HW (with award wining TI chipset) runs at 3Mb/s on my 5km long
line, while ordinary ADSL (Draytek)
struggles to get to 2Mb/s. My SNR fluctuates from 9 downwards, disconnects
several times a week with the Draytek.
Regards,
Martin