[wellylug] DSE Serial Modem Flow Control

[Jethro Carr]

On Tue, 2005-02-08 at 22:06, Jamie Dobbs wrote:
> Make sure you have a fully compliant modem cable and use hardware flow
> control - soft flow-control is generally crap.

I know I have a decent modem cable. I use the one from the box & I also
tried the one from my other modem.


I've sent an email to DSE support. Maybe they can give me some info. 

Also, here's what I've found from playing around:

I can download anything okay, & upload very small amounts of data (such
as a request to view a webpage),but when I want to upload something of
common size - such as sending an email, the program will timeout.

I've looked this up in google & the Linux Modem & Serial Port HOWTOs,
and they say this sort of program can be caused by flow control not
working.

I looked up the AT command set for this modem in the PDF manual, and it
says that the K3 & K4 commands should enable flow control. I tried these
AT commands, but they appear to make no effect on the problem. I also
tried to change the serial port settings with the stty program, but this
didn't work either.

The modem lights are like:

DISCONNECTED FROM THE WEB:
MR = on
CTS = on

CONNECTED TO THE WEB:
MR = on
TR = on
CD = on
SD & RD = on when data transfer is occuring.
RTS = on
CTS = on
OH = off



if anyone can help me, it would be great.

Does anyone else here have this particular modem? If so, I wouldn't mind
seeing what AT commands you use with it.


thanks,



> 
> > hi all,
> >
> > I just got a DSE Electronics Serial 56k Modem
> > (http://www.dse.co.nz/cgi-bin/dse.storefront/4207ba1c0067f898273fc0a87f9906e9/Product/View/XH1142)
> >
> >
> > It works, except I can't seem to enable flow control. This is a problem,
> > because when I try to upload anything, the modem gets the data sent to
> > it too fast, and drops the packets. This makes it impossible to even
> > send email.
> >
> >
> > Can anyone give me some help here?
> >
> > I've tried using the &K4 command (to enable xon/xoff), but it doesn't
> > appear to do work. :-(
> >
> >
> >
> > thanks,
> >
> > --
> > -- Jethro
> >
> > dodocaptain at paradise.net.nz
> > jethro.carr at jedolinux.com
> >
> > http://www.jedolinux.com
> > http://homepages.paradise.net.nz/jethroc
> > http://homepages.paradise.net.nz/jethroc/cv.html
> >
> > http://www.wellylug.org.nz
> >
> >
> > --
> > Wellington Linux Users Group Mailing List: wellylug at lists.wellylug.org.nz
> > To Leave:  http://lists.wellylug.org.nz/mailman/listinfo/wellylug
> >
> >
> >
-- 
-- Jethro

dodocaptain at paradise.net.nz
jethro.carr at jedolinux.com

http://www.jedolinux.com
http://homepages.paradise.net.nz/jethroc
http://homepages.paradise.net.nz/jethroc/cv.html

http://www.wellylug.org.nz