Re: How to determine actual modem speed

[Ookhoi <ookhoi@dds.nl>]

> > Is there a way to measure the actual speed at which a modem is
> > connected? As modems negotiate the speed al the time, the CONNECT string
> > at the start of the connection is not up to date some time later.
> 
> Depending on your modem model, there's probably an AT command which will
> give this information. For my USR Courier, it's ATI6. My older modem was a
> Cardinal internal which IIRC used a Rockwell chipset, and used the command
> AT&V1.
 
Thanx! I have an internal Dynalink and an external E-tech, both 56k. Do
you have any advice for me how to tune them so that they communicate as
fast as possible? Most likely I have to replace the Dynalink with an
identical E-tech, but then? What mru and mtu should I try? And what mnp
block size? There are three exchanges between the modems.

> If I reset the Courier (ATZ), it will forget the speed. To get around this
> you can either use cu from the uucp package, or modify the modem init string
> in minicom from ATZ to ATI6Z.

Maybe a stupid question, but how can I send the command to the modem? I
connect with the pppd and a chat script. After that  minicom -o doesn't 
let me in: "Device /dev/ttyS3 is locked.", although the manuals says:

       -o   Do  not initialize. Minicom will skip the initializa-
            tion code.  This option is handy if you quitted  from
            minicom without resetting, and then want to restart a
            session. It is potentially dangerous though: no check
            for  lock  files etc. is made, so a normal user could
            interfere with things like uucp... Maybe this will be
            taken  out  later.  For now it is assumed, that users
            who are given  access  to  a  modem  are  responsible
            enough for their actions.

Thank you for your reaction!

		Groetjes, Ookhoi