Date   : Sat, 15 May 2010 18:03:57 +0100
From   : adsb@... (Andrew Benham)
Subject: [OT] ADSL capabilities A Fault Found!

On 14/05/10 16:33, Andrew Hancock wrote:

> When this test was completed the line FAILED, a RED alarm was given for AC
> Longitudinal Balance of 50 db. The BT Openreach Engineer stated this should
> be above 65 db.
....
> So from the Exchange to the Pole is now a new line. The new AC Longitudinal
> Balance is 66 db, and the Line Check passes.

Well, I suppose 66dB is *just* above 65dB !

I'm presuming that AC Longitudinal Balance is a measure of how well the
pair is balanced and rejects external interference.  So an additional
16 dB is no doubt worth having.

> The Engineer did mention he's rather sceptical that this is the issue, and
> if the intermittent issue comes back to shift the line to new equipment in
> the exchange and replace line from the property to pole.

I did mention in a an earlier email if you have an old installation
your drop wire and/or overhead cable might not be twisted-pair.  If
that's the case, replacing the line from master socket to pole might
be good news.

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

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