Date : Fri, 14 May 2010 16:33:27 +0100
From : andrew.hancock@... (Andrew Hancock)
Subject: [OT] ADSL capabilities A Fault Found!
Well BT Openreach came out again today.....
The BT Openreach Engineer came to the property to conduct a Full Line Test,
the Line Test that was completed last week was not a Full Line Test, to
complete a Full Line Test which tests more variables a Remote Monitoring
piece of equipment has to be connected to the end of the line.
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. The BT Openreach engineer was getting a little confused
because he kept stating that throughput would always slow down, I had to
produce graphs, and tell him it's SYNC is changing, and he confirmed that
this should never change.
He made a call to his people, and asked to talk to the ISP, I'm not too sure
if this was Eclipse, or BT Wholesale because in talking with them, they
checked their logs, and could see the line drop a lot, and the quality of
line was poor - there quality of line check is apparently a number of checks
combined, as the BT Openreach Engineer does specific individual checks. The
Engineer didn't really know what AC Longitudinal Balance is, but knew that
it should be above 65 db, in speaking with maybe BT Wholesale, they
confirmed that this was not right.
So the Engineer went off with his equipment to check at the cabinet what the
AC Longitudinal Balance was, and confirmed the fault lay between the cabinet
(not far from the exchange) and the property. As this is underground to the
pole, the Engineer found "luckily" a house in the hamlet, currently empty, a
spare line, so we have been switched onto a new line at the exchange.
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.
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.
We will have to wait and see.......
Regards
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: 12 May 2010 15:46
To: bbc-micro@...
Subject: Re: [BBC-Micro] [OT] ADSL capabilities
On 11/05/10 18:17, Andrew Hancock wrote:
> Is a "better" different router (Netgear, 2Wire) going to help us, with
> variable intermittent SNR/Att, when 90% of the time it's okay.
Well, it's the classic engineers' response: when faced with a piece of
hardware which used to work and now doesn't, attempt to completely
redesign the area in which the fault has occurred. You don't want
an electronic design engineer trying to mend your TV...
Your ADSL used to work properly, now it doesn't. So something has
changed, and finding that is the most useful action. Changing your
router might make some difference, but you'll still have the real
fault hanging around.
> Telephone Line warms up later a real drop in temperature, gets cold,
> contracts problem occurs.
>
> Line is cold, warms up, expands problem occurs.
>
> This what we've observed over the last few days, when temp dropped to -2
> Degrees C. I can only hypothise about contracting and expansion, but the
> problems occur with rise and fall of temp.
That's a possible situation. If it is temperature related, I think it's
more likely to be a cable join "out in the open" rather than underground
(where it would be more insulated from temperature changes). Without
knowing your installation it's hard to come up with likely candidates,
but I'd reckon good places to look are the overhead/drop wire joint
(especially if it's an old "twist the wires together" joint rather than
the newer weatherproof closure), and then the connections at the top of
the pole.
I gather that the wiring at the top of poles can be pretty awful
sometimes. Certainly ours is - essentially every time an Openreach
employee goes up the pole our line stops working.
> PS Good News is BT are back on Friday, to "walk the line" and I don't
think
> that's anything to do with Johnny Cash!
I'll keep my fingers crossed on Friday for 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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