Date   : Thu, 06 May 2010 17:58:49 +0100
From   : adsb@... (Andrew Benham)
Subject: [OT] ADSL capabilities

On 05/05/10 20:36, Andrew Hancock wrote:

> 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

Ah.  Perhaps I missed this in your original message.  Are you saying
that your sync speed varies a lot ?  The way I read the original message
was that it had been OK up to Jan 2009 and was now very low.

> 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

Yep, spot on.  I'm guessing that you're using a DrayTek router - not
a brand I've had any experience with I'm afraid.

So what's happened to bins 121 to 136 or so ?  The fact that those bins
aren't being used at all but those either side are looks a tad
suspicious.  521kHz to 586 kHz: that's the bottom end of medium wave,
so I'd get my portable radio out and see if there's a big local signal
there.


-- 
Andrew Benham         adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill"