Date   : Wed, 05 May 2010 20:36:22 +0100
From   : andrew.hancock@... (Andrew Hancock)
Subject: [OT] ADSL capabilities

Andrew

As I type this my sync speed is dropping....

G.DMT   SHOWTIME        448000  1696000         16.0    49.0

Interesting, because it's been at least a week, since the last occurrence.

When we cold/warm start the routers, we sync back-up again at 

G.DMT   SHOWTIME        448000  2944000         8.5     49.5

I've also captured some BIN stats, if these are what you are referring to.


http://www.cyrus-consultants.co.uk/adsl/bin-bits.jpg

http://www.cyrus-consultants.co.uk/adsl/bin-snr.jpg

http://www.cyrus-consultants.co.uk/adsl/bin-gain.jpg

Thanks

Andrew

-----Original Message-----
From:
bbc-micro-bounces+andrew.hancock=cyrus-consultants.co.uk@...
[mailto:bbc-micro-bounces+andrew.hancock=cyrus-consultants.co.uk@...
9.co.uk] On Behalf Of Andrew Benham
Sent: 05 May 2010 18:11
To: bbc-micro@...
Subject: Re: [BBC-Micro] [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"

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