Is BT Broadband possible at 62.5 line loss?

"chris" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ...
> On Tue, 25 May 2004 00:13:36 +0100 and in article <ipidnc-ofNY-HC_dRVn-
> (E-Mail Removed)>, Paul said...
> : I've been refused BB by BT on the ground that it's just not possible at
62.5
> : dB line loss (nothing possible above 60, they claim). What is the
technical
> : position? Could BB conceivably work at 62.5?
> :
> Yes, it could. And I reckon if the engineer only enabled the line it
> MIGHT very well work. Indeed, BTWholesale reckon this too and hence
> they are trialling up to 10km away from the exchange in Milton Keynes.
> I'm afraid you'll just have to wait until the trial is finished and the
> limtis are upped :/
> --
> chris

Yes it could - some do at that figure and some don't. It also depends what
type of modem or router you have.

When I was -68dB/3.5dB at my old house it didn't do too well on the usb
modem but was fine on my router. I was definately too far away though as it
was great in summer, but lost sync winter nights.

New house is -63dB/8.5dB and 100%.

I've been refused BB by BT on the ground that it's just not possible at 62.5
dB line loss (nothing possible above 60, they claim). What is the technical
position? Could BB conceivably work at 62.5? 60 seems too much of a 'round
figure' to be credible as a cast iron boundary between 'available' and
'unavailable'! Are they just 'playing safe'?

--
Paul Clarke



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On Tue, 25 May 2004 00:13:36 +0100 and in article <ipidnc-ofNY-HC_dRVn-
(E-Mail Removed)>, Paul said...
: I've been refused BB by BT on the ground that it's just not possible at 62.5
: dB line loss (nothing possible above 60, they claim). What is the technical
: position? Could BB conceivably work at 62.5?
:
Yes, it could. And I reckon if the engineer only enabled the line it
MIGHT very well work. Indeed, BTWholesale reckon this too and hence
they are trialling up to 10km away from the exchange in Milton Keynes.
I'm afraid you'll just have to wait until the trial is finished and the
limtis are upped :/
--
chris

The entity currently known as chris wrote:

> On Tue, 25 May 2004 00:13:36 +0100 and in article <ipidnc-ofNY-HC_dRVn-
> (E-Mail Removed)>, Paul said...
> : I've been refused BB by BT on the ground that it's just not possible at 62.5
> : dB line loss (nothing possible above 60, they claim). What is the technical
> : position? Could BB conceivably work at 62.5?
>
> Yes, it could. And I reckon if the engineer only enabled the line it
> MIGHT very well work. Indeed, BTWholesale reckon this too and hence
> they are trialling up to 10km away from the exchange in Milton Keynes.
> I'm afraid you'll just have to wait until the trial is finished and the
> limtis are upped :/

I have ADSL working just fine with consistent line loss of 61.3dB (S/R
margin of 5dB), yet I get the full 512/256 data rates. I never see any
problems with loss of signal or frame, althoiugh the errored seconds
might be higher than others see.

--
I second that emotion

Paul <(E-Mail Removed)> wrote:
> I've been refused BB by BT on the ground that it's just not possible at 62.5
> dB line loss (nothing possible above 60, they claim). What is the technical
> position? Could BB conceivably work at 62.5? 60 seems too much of a 'round
> figure' to be credible as a cast iron boundary between 'available' and
> 'unavailable'! Are they just 'playing safe'?

There is no cast iron boundary.
At some number, enough ADSL lines will be unreliable that the cost of the
engineers call-outs for faults will cost BT more than some internally
generated budget.

For example, my line Whooshed at around 60.5db (but got a smiley-face,
so I got it.)

My current attenuation is 63.9, with 9.8 SNR margin.
There have been no dropouts today or yesterday, but the five days
before that had 584/17/96/0/193 seconds of unavailability.

"Iain A F Fleming" <(E-Mail Removed)> wrote in message
news:m3aczx.csin-(E-Mail Removed)...
> I have ADSL working just fine with consistent line loss of 61.3dB (S/R
> margin of 5dB), yet I get the full 512/256 data rates. I never see any
> problems with loss of signal or frame, althoiugh the errored seconds
> might be higher than others see.

The current dB limit is 64 if you have ADSL enabled on the line.

Its <60 with no ADSL on... though as Chris says both of these are currently
being reviewed.

Regards
Sunil

In article <(E-Mail Removed)>, (E-Mail Removed),
a.k.a Sunil Sood says...


> The current dB limit is 64 if you have ADSL enabled on the line.


Is there any way of checking what dB limit there is on the line yourself
or does this have to be done by a BT engineer?

Mine is pretty low i recall, but i'd like to know just the same.

BT, like any other commercial company, has to sell products that will
actually work. Although ADSL may well work with 62.5dB line loss the limit
has to be set somewhere. It would be stupid for BT to set a limit that might
in many case not work. In other words they have to leave some degree of
safety margin. It may be tough on you but that is the way it is.

"Tx2" <tx2newscollection-invalid-@hotmail.com> wrote in message
news:(E-Mail Removed) t...
> Is there any way of checking what dB limit there is on the line yourself
> or does this have to be done by a BT engineer?
>
> Mine is pretty low i recall, but i'd like to know just the same.

Some ADSL routers will give you a reading but that won't necessarily agree
with BT's own test equipment (which is what counts)

Regards
Sunil

In article <(E-Mail Removed)>, (E-Mail Removed),
a.k.a Sunil Sood says...


> Some ADSL routers will give you a reading but that won't necessarily agree
> with BT's own test equipment (which is what counts)


I have a Draytek 2600 .... on one of the config pages it shows my online
status, and has entries entitled SNR Margin and Loop Att, set at 39.5
and 23.5 respectively. I presume the 23.5 reading might be indicative of
my situation?