Hi all,
Ever since my ISP changed equipment a couple of months ago I've been
suffering from *very* frequent line drops when I connect at high speeds.
If I reduce the connection speed I can avoid the dropouts, but needless to
say I'd rather not have to do that ;)
As I see it there are three possible reasons for the problem :
a) My ppp and modem setup is not correct. Blame me.
b) The firmware in my ISP's new modems is buggy :-( Blame USR.
c) My phoneline has gone noisy. Blame my telco.
What I'd like to find out is which of the three is the actual one, but to
do so I need some help. Since I used to have reliable high speed
connections ( > 50kps) I tend to believe that (b) is actually the problem,
but I don't know how to prove that.
My system is using ppp 2.3.3 with a USR 56K V.90 modem and my ISP uses a
'US Robotics Total Control Chasis' (some marketing info can be found at
http://www.3com.com/solutions/svprovider/products/datasheets). I hardly
ever see *any* dropped frames, errors, or overruns (according to ifconfig
and pppd's log) - not even when the line is dropped - so it seems unlikely
that my phoneline should have become noisy (remember, I used to get high
speed connections without any problems). But at the same time I don't
see anything else that can explain why my line is being dropped.
Initially my modem and my ISP's modem will agree to communicate at up to
50666 bps, but although I can get this connection it is unlikely to last
more than a few minutes. The duration of my connection will gradually
increase as the speed is decreased and by 41333 it seems fairly stable.
I've tried to look at what is being transmitted/received just before the
line is dropped but so far I've not been able to see any pattern. Does
anyone have any ideas as to what else I can try to do to find the culprit ?
Thanks
Rasmus
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