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000278_news@watsun.cc.columbia.edu _Wed Feb 24 22:00:01 1999.msg
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From: C Lance Moxley <clm@uiuc.edu>
Subject: Re: Setserial High Speed Help
Date: 25 Feb 1999 02:31:55 GMT
Organization: University of Illinois
Message-ID: <7b2cmr$3er$1@vixen.cso.uiuc.edu>
To: kermit.misc@mailrelay2.cc.columbia.edu
In comp.os.linux.hardware Mickey Stein <yekkim@cts.com> wrote:
> I know I missed 99% of this thread but I've got a 16750 UART and an ISDN modem.
> The UART is capable of 921,600 baud_total. The Modem is capable of 230400 via a
> special command to the modem. To setup the UART via setserial in Linux, I've got
> to use a "setserial /dev/ttySx UART 16750 baud_total 921600 baud_divisor 4
> spd_cust" command but forgive me for the syntax errors since I'm not in linux at
> the moment. It's close to that command anyway. This allows the UART to operate at
> 921600 (which is the true top speed for the 16750) divided by 4 which is the
> divisor that'll give you 230400 and then spd_cust tells it that when you set the
> baud rate to 38,400 to REALLY run at 230,400. I know that sounds insane but do a
> man on setserial and check it out. No way can I do a setserial 230400 or ppp baud
> set = 230400 and get anything to work.
This is the part that I need help with. My serial card has a 16650
UART. The manufacturer says that it will go 460800bps. So you're
saying that if I set the baud_base to 460800 and the divisor to 2
I'll be able to get 230400bps if I use spd_cust and set my ppp to
use 38400?
I've poured over the setserial manual but didn't figure out that
38400 would really mean something else.
> The second part is whether you're using a modem on this serial port and if so :
> is it an isdn modem or some modem that is really designed to operate at 230400?
> There's only 2 isdn modems that I know of (bitsurfer and 3com iq) that'll run at
> this speed and even then they won't take typed in "AT" commands at that speed. As
I have an Eicon Diva ISDN T/A. The manual says to drive the DTE at 230400
if you can and that's what I'm trying to do. I don't know if it will
take AT commands at that speed or not. If not, then how do you really
get it to run at 230400? I mean, you have to dial a number somehow.
--
C Lance Moxley
http://www.uiuc.edu/ph/www/clm