lkml.org 
[lkml]   [1999]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: driver for 3COM USR PCI v.90 modem?
Date
Hi all,

Writing a softmodem driver should be fairly tricky, all in.
It looks like you need to setup a thread to convert the digital data going
out to frequency-modulated sound with the aid of a DSP on the softmodem
card.
This thread needs to be run at a high priority, so an underrun condition is
not reached. Unfortunately, not all softmodems have a DSP, some don't have a
'datapump' either. I don't know what happens in this case (memmap the phone
line?? heehe).

Rockwell is one of the large supplier of softmodems (+generic). 3com and
Lucent Technologies are other large suppliers. AFAICT, the rockwell chipset
is used in the majority of softmodems I have seen. A while ago, the Rockwell
modem division changed hands (or something of some sort), so maybe they will
be a little more helpful if asked for info.

I must admit, I had a couple of softmodems in computers at home here, but I
ditched one for a real modem. If I can get some tech docs, I'd try my hand
at writing a driver. Hmmm...

Dan
__________________________
Daniel J Blueman - daniel.j.blueman@stud.umist.ac.uk
Undergraduate - BSc Computing Science
UMIST university - Manchester


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:53    [W:0.041 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site