Date : Wed, 05 May 2010 18:10:59 +0100
From : adsb@... (Andrew Benham)
Subject: [OT] ADSL capabilities
On 05/05/10, Andrew Hancock wrote:
> After finally getting BT Openreach out today to complete tests, they
> state we are at the very end of ADSL (3609 metres), and it looks like
> BT are going to throw in the towel and say tough!
I think that's BT being lazy:
1/. That's not the very end of ADSL
(see
http://www.internode.on.net/residential/broadband/adsl/extreme/performance/
and
http://www.kitz.co.uk/adsl/max_speed_calc.php
)
2/. Something has changed, as it used to work OK. Have you been
ADSL2+'d by your ISP since Jan 09 perhaps ? Have you bought
some new electrical appliance with a noisy switch-mode power
supply ? Have you taken the suppressor capacitors out of your
BBC Micro's power supply :-)
> BT are now sending a man with a sniffer to record Radio Interference,
> which they think could be the cause.
That does sound a possibility. My ADSL suffered around this time last
year, going from 4.5Mb/s to < 1Mb/s (and sometimes 0). I found that
there was so much RF interference in the house that I couldn't listen
to Radio 4 198kHz in some rooms. Turned out to be something up with
my neighbour's burglar alarm.
If you have a portable LW/MW radio, it might be worthwhile having a
walk around your property with it and see if there's some loud
interference.
Do you have access to the 'bits per frequency bin' data on your
ADSL modem ? It might show where there are holes, although it
won't be as easy as it might be because presumably you don't have
'before' data.
Are the other ADSL users in the hamlet close to you ? If so and
they're not having problems, it does rather point to something
in your premises. Or your ISP - are any of the other ADSL users
in the hamlet on the same ISP as you ?
--
Andrew Benham adsb@...
Southgate, London N14, United Kingdom
The gates in my computer are AND OR and NOT, not "Bill"