serial question

serial question

[Gregory Nowak]

Hi all,

I've just successfully setup a ppp link over a null-modem with my 2 machines.
The HOWTO recommends starting te connection at 38400 baud.
However theese are modern machines (a 100 MHz 486, and a 600 MHz pentium III) both with 16550a uarts.
I was wondering if I could go at 115200 instead?
Can I go even faster?
Thanks for any help in advance.
Greg

Re: serial question

[Thomas Ward]

Wo. Hold on here. As far as I know serial ports and serial connections only
can support up to 38400 BPS, and that has nothing to do with processor
speed, but hardware speed of the serial devices.
Sure modems themselves support 115200, but going from machine to machine I
believe 38400 is max over serial ports. If someone knows any different let
us know, because it would be a nice thing to know.

----- Original Message -----
From: Gregory Nowak <gnowak1@uic.edu>
To: <speakup@braille.uwo.ca>
Sent: Monday, December 03, 2001 8:58 PM
Subject: serial question


> Hi all,
>
> I've just successfully setup a ppp link over a null-modem with my 2
machines.
> The HOWTO recommends starting te connection at 38400 baud.
> However theese are modern machines (a 100 MHz 486, and a 600 MHz pentium
III) both with 16550a uarts.
> I was wondering if I could go at 115200 instead?
> Can I go even faster?
> Thanks for any help in advance.
> Greg
>
>
>
> _______________________________________________
> Speakup mailing list
> Speakup@braille.uwo.ca
> http://speech.braille.uwo.ca/mailman/listinfo/speakup

Re: serial question

[Kirk Reiser]

Standard modern serial ports can handle 115200 quite nicely.  There is
no reason to keep your ppp connections when direct to 38400.  You will
want to make sure you are using hardware handshaking though.

  Kirk

-- 

Kirk Reiser				The Computer Braille Facility
e-mail: kirk@braille.uwo.ca		University of Western Ontario
phone: (519) 661-3061

Re: serial question

[Gregory Nowak]

After posting my message,
I did some experimenting starting at 460800 baud.
I ended up having to drop down to 115200, and the machines comunicate fine there (they're not too slow either, I'm surprised with the transfer speeds).
Greg


On Tue, Dec 04, 2001 at 03:29:42AM -0500, Thomas Ward wrote:
> Wo. Hold on here. As far as I know serial ports and serial connections only
> can support up to 38400 BPS, and that has nothing to do with processor
> speed, but hardware speed of the serial devices.
> Sure modems themselves support 115200, but going from machine to machine I
> believe 38400 is max over serial ports. If someone knows any different let
> us know, because it would be a nice thing to know.
> 
> ----- Original Message -----
> From: Gregory Nowak <gnowak1@uic.edu>
> To: <speakup@braille.uwo.ca>
> Sent: Monday, December 03, 2001 8:58 PM
> Subject: serial question
> 
> 
> > Hi all,
> >
> > I've just successfully setup a ppp link over a null-modem with my 2
> machines.
> > The HOWTO recommends starting te connection at 38400 baud.
> > However theese are modern machines (a 100 MHz 486, and a 600 MHz pentium
> III) both with 16550a uarts.
> > I was wondering if I could go at 115200 instead?
> > Can I go even faster?
> > Thanks for any help in advance.
> > Greg
> >
> >
> >
> > _______________________________________________
> > Speakup mailing list
> > Speakup@braille.uwo.ca
> > http://speech.braille.uwo.ca/mailman/listinfo/speakup
> 
> 
> _______________________________________________
> Speakup mailing list
> Speakup@braille.uwo.ca
> http://speech.braille.uwo.ca/mailman/listinfo/speakup