Oleg,
I was getting ready to reply but finished reading the rest of the
e-mails first and saw the reply I copied at the bottom. I also have
the same modem and experience the same problem sometimes, but not all
the time. With my ISP the problem happens sometimes. When I connect
to a friend's ISP, the problem never happens so I've thought the
problem was with my ISP - it may be their lines/modems aren't quite as
good as my friend's ISP.
I'm at work now so I don't have the manual that came with the modem
with me, but I found some on-line manuals at:
http://consumer.3com.com/modem/manual/index.html
According to this (the v90tecrf.pdf one), it looks to me like:
AT&U14&N29
would require the modem to connect between 28.8 and 44.0 kbps.
I'll try this tonight or tomorrow and let you know. If you try it and
it works, please let me know.
Thanks,
Dave
[EMAIL PROTECTED]
-----------------------------------------------------------------
> Date: Thu, 09 Dec 1999 00:43:57 -0600
> From: Oleg Okunev <[EMAIL PROTECTED]>
>
> Hello!
>
> Sorry if this is offtopic, but the manual that comes with the modem
> is written for Windows users (no commands list, switches description,
> etc. - good for nothing.)
>
> The problem is, when I try to use it, I consistently get ftp/hhtp
> download rates about 200 B/s. So I swear at my provider and
> sites on the routes, then plug in my old 28.8 internal, and get
> about 3 KB/s... (not once, so it does not seem to be a coincidence). I
> can communicate with the USR modem through minicom, and there are no
> visible delays, so it does not appear to be an IRQ/setserial/...
> problem).
>
> Anyone has experience with this modem? An init string trick? PNP?
> Or is it no good for Linux at all? (Well, perhaps my provider does not
> support X2/ITU56K, but could this be a reason to work so much slower
> than the old 28.8?)
>
> The model number of the modem is 215686-03. The system is RedHat 6.1,
> kernel 2.2.13, the modem connects to ttyS1 on Soyo SY-5EMA+ v.1.0
> motherboard, the init string currently used is "AT\&F1S0=0X4\&c1E1Q0"
> (what else could be relevant?).
>
> Any help/pointers to FM appreciated.
>
> Best regards,
> Oleg
Find (somehow) the AT command to set the maximum connect rate. I've
had throughput problems on V90s that were continuously re-training the
line and tweaking their connect speeds.
e.g. you can just barely connect at 45333, so it does, the line drops
to 44000, the modem re-trains at 45333 (meanwhile no real data moves),
then drops to 44000 etc. In this case, just fix the modem's max connect
rate to 44000 and it wont bother trying to go faster.
YMMV, worked for me in 1 situation.
--
Edward Schernau http://www.schernau.com
Network Architect mailto:[EMAIL PROTECTED]
Rational Computing Providence, RI, USA
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