I've helped a few customers with this kind of problem.
Check 1) environmentals - temperature and air circulation, 2) the baud
rate on the ports and 3) the init string.
For sportsters and other light duty modems temperature is a real
problem. They heat up and just go looney tunes.
All of the ports using a type of modem should have the same baud rate and
have it set on all 3 speeds. Sometimes sportsters will work at 115200,
sometimes they won't and you have to drop back to 57600.
An init string I've found works most of the time for sportsters is:
add modem usr-sprt "USR sportster" 57600 \
"at&f1&c1&d2s0=1s2=128s10=20s13.0=1&w0\r^OK"
&f1&c1&d2 - hardware flow control, normal DCD and DTR ops
s13.0=1 - special bit so that the modem resets when dtr drops.
s2=128 disables the escape sequence.
s10=20 - wait 2 seconds with out the carrier on the telco line before
dropping the call.
> > Also, is there any problem with setting the modem speeds to 115* instead
> > of 57600 on the PM? I did not know if the PM would react funny if that
> > was higher than the modems would actually support....
>
> Ummm.... Yes, there's a problem with it. It will give you massive
> framing errors. :-0
It will indeed. It also will result in users not being able to login.
> Framing errors are almost always the result of a mismatch between the
> port speed of the Portmaster and that of the modem.
Yup. They sometimes indicate bad phone lines, but you have to check the
baud rate first.
JGT
-- John G. Thompson Livingston Enterprises Inc. Phone: (800) 458-9966 JOAT(MON) 4464 Willow Road Fax: (510) 426-8951 support@livingston.com Pleasanton, CA 94588 http://www.livingston.com