Switching between ADSL1 and ADSL2+

A friend had had his Demon ADSL connection upgraded to ADSL2+, and to
take advantage of this he has bought a new router. This works, but
due to some configuration problems he wanted to switch back to his old
(non-ADSL2+) modem, only to find it no longer works - it apparently
doesn't sync with the exchange.

Is there any reason why this should happen? Does using ADSL2+ cause
something to get switched so that ADSL1 no longer works?

-- Richard
--
Please remember to mention me / in tapes you leave behind.

Brian Gregory [UK] wrote:
> "Richard Tobin" <(E-Mail Removed)> wrote in message
> news:h2ta4d$65f$(E-Mail Removed)...
>> A friend had had his Demon ADSL connection upgraded to ADSL2+, and to
>> take advantage of this he has bought a new router. This works, but
>> due to some configuration problems he wanted to switch back to his old
>> (non-ADSL2+) modem, only to find it no longer works - it apparently
>> doesn't sync with the exchange.
>>
>> Is there any reason why this should happen? Does using ADSL2+ cause
>> something to get switched so that ADSL1 no longer works?
>
> Yes, as I understand it the equipment at the exchange usually only supports
> one standard.

My ISP's (NewNet LLU) seems to support both. If I connect an old ADSL1 router
it works, albeit at a slower d/s rate (as you'd expect).



--
Mark
Please replace invalid and invalid with gmx and net to reply.

www.paras.org.uk

In article <Wq2dnbHXA-(E-Mail Removed)>,
Peter Crosland <(E-Mail Removed)> wrote:

>If the exchange has been set use ADSL2+ modulation then a non ADSL2+ modem
>will not work.

So when does this happen? He was informed by Demon that his
connection had been upgraded, and his old modem continued to work. He
then bought a new modem and plugged it in, and that worked (modulo
configuration problems). A few minutes later he plugged the old one
back in, and it didn't work. Did plugging in the new modem cause
the modulation to get irreversibly switched?

>The correct solution is to find out what is wrong with the
>configuration of the new modem.

Of course. But it is inconvenient to have your network down while
the problem is resolved.

-- Richard
--
Please remember to mention me / in tapes you leave behind.

"Peter Crosland" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) o.uk...
>>>If the exchange has been set use ADSL2+ modulation then a non ADSL2+
>>>modem
>>>will not work.
>>
>> So when does this happen? He was informed by Demon that his
>> connection had been upgraded, and his old modem continued to work. He
>> then bought a new modem and plugged it in, and that worked (modulo
>> configuration problems). A few minutes later he plugged the old one
>> back in, and it didn't work. Did plugging in the new modem cause
>> the modulation to get irreversibly switched?
>>
>>>The correct solution is to find out what is wrong with the
>>>configuration of the new modem.
>>
>> Of course. But it is inconvenient to have your network down while
>> the problem is resolved.
>
>
> It may just be coincidence but the relevant question is to find out why
> the configuration of the new modem does not work. That really should be
> quite easy. Most modern modems have an automated set up routine that only
> requires the ID and password details to be input. Have the ISP been asked
> for help?

I would have thought that the ISP should help.
When I upgraded to a new router (which is capable of handling ADSL2+ as
well, but I can't yet get ADSL2+) I contacted my ISP - Plusnet - who
directed me to a page on their website devoted to that particular router. By
following the configurations, I was up and running very quickly.
Whether or not the OP's ISP is as clued-up as Plusnet, however, is another
matter....

George

In article <(E-Mail Removed) >,
Peter Crosland <(E-Mail Removed)> wrote:

>It may just be coincidence but the relevant question is to find out why the
>configuration of the new modem does not work.

It's nothing like that. It's just a question of how to configure it
for "half-bridged" mode, which is how his old system was set up. I'm
not trying to solve that problem here, just find out why switching
back to the old modem didn't work.

Two people in this thread have said that a line configured for ADSL2+
won't work with non-ADSL2+ modems. On the other hand, there have been
articles in other threads referring to this being something negotiated
between the modem and the exchange when the modem is connected. Can
soeone give a definitive answer to that?

-- Richard
--
Please remember to mention me / in tapes you leave behind.

Richard Tobin wrote:

> Two people in this thread have said that a line configured for ADSL2+
> won't work with non-ADSL2+ modems.

Seems unlikely as it's only going to push up support costs for the SP.

> On the other hand, there have been articles in other threads referring to
> this being something negotiated between the modem and the exchange when
> the modem is connected.

Every bit of DSL kit I've used defaults to 'multimode', which means it will
pick the fastest supported when it syncs up.

> Can soeone give a definitive answer to that?

Yes, the service provider concerned can.

--
<http://ale.cx/> (AIM:troffasky) ((E-Mail Removed))
15:39:45 up 62 days, 1:03, 2 users, load average: 0.04, 0.14, 0.12
A few flakes working together can unleash an avalanche of destruction

In article <(E-Mail Removed)>, alexd <(E-Mail Removed)> wrote:

>> Can soeone give a definitive answer to that?

>Yes, the service provider concerned can.

You'd think so, wouldn't you, but Demon's support line seemed uncertain.

I see that Demon are now Cable and Wireless and have LLU in the
relevant exchange (rather than it being BT's WBC), so it's their own
equipment, which may explain it if what others have said here is
right.

-- Richard
--
Please remember to mention me / in tapes you leave behind.

Richard Tobin wrote:
> In article <(E-Mail Removed)>, alexd <(E-Mail Removed)> wrote:
>
>>> Can soeone give a definitive answer to that?
>
>> Yes, the service provider concerned can.
>
> You'd think so, wouldn't you, but Demon's support line seemed uncertain.
>
> I see that Demon are now Cable and Wireless and have LLU in the
> relevant exchange (rather than it being BT's WBC), so it's their own
> equipment, which may explain it if what others have said here is
> right.
>
> -- Richard

I suspect Demon are reselling someone elses LLU dsl, tiscali perhaps.

On Fri, 10 Jul 2009, eps wrote:-

>Richard Tobin wrote:

>> You'd think so, wouldn't you, but Demon's support line seemed
>>uncertain.
>> I see that Demon are now Cable and Wireless and have LLU in the
>> relevant exchange (rather than it being BT's WBC), so it's their own
>> equipment, which may explain it if what others have said here is
>> right.
>> -- Richard
>
>I suspect Demon are reselling someone elses LLU dsl, tiscali perhaps.

It's the Cable and Wireless LLU that Demon use, or at least it was the
C&W engineers that ended up looking into my recent ADSL2+ connectivity
issues.


Regards,
David Bolt

--
Team Acorn: http://www.distributed.net/ OGR-NG @ ~100Mnodes RC5-72 @ ~1Mkeys/s
openSUSE 10.3 32b | openSUSE 11.0 32b | |
openSUSE 10.3 64b | openSUSE 11.0 64b | openSUSE 11.1 64b |
RISC OS 3.6 | RISC OS 3.11 | openSUSE 11.1 PPC | TOS 4.02

On Fri, 10 Jul 2009, wrote:-

>>It's the Cable and Wireless LLU that Demon use, or at least it was the
>>C&W engineers that ended up looking into my recent ADSL2+ connectivity
>>issues.
>>
>>
>>Regards,
>> David Bolt
>Demon have been useless since dial up days David I soon switched to
>Unet when I found out what an abysmal service Demon where providing
>back in those days .

I had virtually no connectivity issues with them when using dial-up, nor
when I started using ADSL and then ADSLMax. There were some very
occasional issues with the mail servers and the news servers couldn't
cope with the explode of binaries. There's still some issues with news
servers, but that's been out-sourced to Highwinds and is only an
occasional problem.

The only real issues I've had with Demon were the connectivity
disappearing and not re-establishing for periods of upto three or four
hours[0]. This started about three weeks after the ADSL2+ upgrade, was
fairly intermittent, and appears to have been sorted out a couple of
weeks ago. Since then, my connection has been a stable 10.5Mbps down and
1024Kbps up, and shown no signs of throttling or other limitation.

Having said all that, I almost exclusively use Demon just for
connectivity, with the occasional binaries download from Usenet, so the
status of their homepages or mail servers are of little concern to me.


[0] I did have a four-day outage at the end of May. Started late
Thursday afternoon and reported during that evening. The connection was
re-established in the early hours of Monday morning, which was a bit of
a surprise since it was a Bank Holiday. That was the only ever long
duration interruption I've ever had with Demon.

Regards,
David Bolt

--
Team Acorn: http://www.distributed.net/ OGR-NG @ ~100Mnodes RC5-72 @ ~1Mkeys/s
openSUSE 10.3 32b | openSUSE 11.0 32b | |
openSUSE 10.3 64b | openSUSE 11.0 64b | openSUSE 11.1 64b |
RISC OS 3.6 | RISC OS 3.11 | openSUSE 11.1 PPC | TOS 4.02