On Fri, 28 Dec 2007 14:39:37 +0000, Peter Able wrote:
> PCPaul wrote in message
>> In any case, this line is mainly for business use during daylight, but
>> the abysmal nighttime noise levels have led to the 576kbps speed limit
>> - can anything be done to get this increased so I can get a decent
>> speed during the day (steady 12-14dB margin) but accept lots of
>> dropouts at night(-2-10dB margin)?
>>
>>
> Like you, I am about three miles from my exchange and use a DG834.
>
> Maybe like you, I see the noise margin degrade during the evening
> period. At 6AM it is about PLUS 6dB, at 6PM it can be as low as MINUS
> 1dB.
I use Routerstats Lite to monitor it - it does go negative sometimes,
and it does seem to manage to hang on right down to 0dB. I guess the
reputation it has for being good on noisy lines is deserved!
> Unlike you, my connect speed is 2.5 to 3.0Mbps - so maybe Im lucky
> and/or you arent.
Thatd be right :-(
> Id guess that the variation is due to crosstalk over the four or so
> miles of cable, and that it gets worse in the evenings as that is when
> there is more data traffic to crosstalk. I doubt that it is to do with
> actual darkness as at this time of the year, 6AM is dark - plus that at
> the height of summer, when 6PM is still bright daylight, the degradation
> profile is just the same!
I havent seen it in summer, so I cant tell. It definitely starts to
drop at about 15:30 and stays very poor right through to 07:00 though. I
can see kids back from school causing more traffic from 15:30 until most
adults give up by about 02:00, but surely there arent that many people
online from 02:00 to 07:00, and Id expect P2P traffic to be fairly
constant...
> I got the DG834 for the reason you mention, and find that it works well
> down to zero dB margin, but will fail, about every ten minutes, when the
> margin becomes negative and so, initially, I tried to minimise how often
> I used the system between 6 and 9PM. This wasnt too difficult as, like
> yourself, this is primarily a work connection. If the line did drop, I
> would disconnect next morning (disconnect via router dialog and then
> physically disconnect the power lead and phone line from the router) for
> a couple of minutes and then reconnect. This meant that I spent very
> little time with a poor profile - and this seems to have stuck - hence
> my 2.5Mbps service.
Ill try that.
>> The only other thing I did was to swap over the
> phone line pair. This makes quite a difference to the drop rate here and
> has had the same effect for others. Might be worth a try. (If it works
> for a while than reverts, BTW, swap them again as - most likely - some
> oik has been up the pole/in the cabinet and has re-swapped your pair!)
Presumably swap the wires in the pair, not try and switch to the spare
pair in the BT cable?
Ill give it a go.
> My Line Attenuation is -53dB, what is yours?
Seems to be dead at the moment (I set it up to allow log in remotely from
my IP only, and on a weird port number..) so I cant find it. I have a
feeling it was in the high -40s.
I guess Ill have to keep resetting it first thing in the morning and see
if the rate increases. We wanted to up the speed so we could start using
VoIP for some calls, but its too crap for that when its running like
this...
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Posted: 2007-12-28 14:59:38
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