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BT and ADSL deployment

N/A

BT and ADSL deployment

Hi,

I recently placed an order with PlusNet for a 1Mbps connection, but the line activation failed and I have reverted to 512Kbps, hoping for a regrade in a short while.

The reason invoked by BT for rejecting the activation request was: out of limits. But I was told that my line qualty was fine.

Could it be that the distance limit imposed by BT is their way of controlling the pace of broadband deployment, and that my line could technically support 1 or 2 Mbps if allowed?

Until now I thought that the noise levels / signal loss were the main reasons but I'm not so sure any longer.

Could anyone shed any light?

Thx
8 REPLIES
Community Veteran
Posts: 14,469
Registered: 30-07-2007

Re: BT and ADSL deployment

Quote
The reason invoked by BT for rejecting the activation request was: out of limits. But I was told that my line qualty was fine.


Who told you your line quality was fine? Did they quote any line attenuation or SNR figures?

Quote
Could it be that the distance limit imposed by BT is their way of controlling the pace of broadband deployment, and that my line could technically support 1 or 2 Mbps if allowed?


BT have line limits for each of the speeds to make sure they don't get a lot of problem reports due to putting too fast a connection on a line that will not reliably support it. It is BT playing safe, not trying to restrict broadband deployment.

Quote
Until now I thought that the noise levels / signal loss were the main reasons but I'm not so sure any longer.


Yes they are.
N/A

BT and ADSL deployment

Hi,

Thanks for your response. The quote that my line quality was fine was made by a member of the PlusNet technical team in response to one of my queries. But I have had no notification of line attenuation or SNR. Where can I go to get these?

Rgds
the_norris
Grafter
Posts: 463
Registered: 02-08-2007

BT and ADSL deployment

Hi

Your router or ADSL modem may provide you with these details. But these are not always spot on. The best way is to raise a ticket to support via the 'Contact us' asking for a Whoosh test.

Then if you post the details for this test here - people here can help you.

Phil
N/A

BT and ADSL deployment

Great, thanks
keithcalder
Grafter
Posts: 182
Registered: 03-08-2007

BT and ADSL deployment

Well I think its the same old story. The paper exercised bandied about in BT offices mean nothing. The only way to check it properly is to try the speed requested. I am now on 1MB and before the distances were increased, was told that my line would not support anything greater than 512, which obviously is not the case as I have a faster speed now.

In short, I reckon my line would support 2MB without ant problem but BT say my line wont support the greater speed which is utter nonsense. I am an engineer myself and completely understand the fundamentals of adsl, so I think unless BT stop farting around with paper exercises and actually try to connect the line at the speed requested, we will all by stuck with the speeds they say are available.

Just my tuppence worth,

Keith
N/A

BT and ADSL deployment

Keith,

I could not have expressed this in better terms. The reason I raised the point initially was that, in the past, I had placed a 512Kbps order with BT Openworld, which was rejected dut to line attenuation issues.

Two weeks later, I placed a similar order for the same line with Tiscali, and the activation took place without any questions. I have since been getting circa 490Kbps bandwith with Tiscali, close to the maximum expected.

Right now I am trying to move away from Tiscali - who have even promised a free upgrade to 1Mbps - due to reliability issues and to get rid of a surplus telephone line at home. In parallel BT announce an increase of the distance limits to 6km for 1Mbps (old limit for 512Kbps). So my naive view is that if my line supported 512Kbps in the past, it should support 1Mbps now, and maybe more in future once MaxDSL when introduced.

Which is why I get frustrated when told that my line is out of bounds. I believe that I should get the 1Mbps service if BT were prepared to take a risk.

Regards
Community Veteran
Posts: 14,469
Registered: 30-07-2007

BT and ADSL deployment

Tiscali use Datastream, BT Retail and PlusNet use IPstream and they are different and incompatible technologies (you can't migrate between them). Also Tiscali have their own line limits and can provision a connection as they see fit, whereas BT Retail and PlusNet have to rely on BT's line limits and I suspect they are not the ame. Tiscali also don't do migations out either, you would have to cease and reprovide ADSL and pay any activation fees again (depending on which ISP you moved to).

Also in the past the BT line limits have been relaxed (the last time was 6/9/04) so depending on when you asked, 1Mbs may or may not have been possible on your line from BT.
N/A

BT and ADSL deployment

Peter,

Thanks again for your post which provides more clarity on a somewhat obscure topic to the non-specialist.

To clarify my current situation:

- I have two lines at home, one activated for 512Kbps, the other not ADSL-enabled
- I use Tiscali, as previously reported, but wishes to cut my monthly BT costs and migrate my broadband service to the other line - at a cost obviously
- As you rightly point out, Tiscali do not support migration, and I want to take the opportunity of the physical line change to move to an ISP with an established reputation for performance and customer service (PlusNet)
- Initially hoped to secure a 1Mbps access
- Didn't want to lose broadband access during the transition (having two lines proves to be a blessing in this case)

...so I placed an order with PlusNet for 1Mbps access on my other line, and have reverted to 512Kbps once the line activation failed. I'm told that the introduction of the MaxDSL standard will provide an opportunity to improve my speed of access over time.

The worst-case end result as I see it: I'll be paying £2/month more for 512Kbps access from PlusNet, but this will be more than offset by the release of my other telephone line.

Best-case: PlusNet find a way to regrade my line quickly and I benefit for an increase speed plus reliability.

Best regards