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From: michaelv@MindBender.HeadCandy.com (Michael L. VanLoon)
Newsgroups: comp.os.386bsd.questions,comp.protocols.ppp,comp.os.linux.help
Subject: Re: PPP at 115200 bps (FreeBSD or Linux?) to a Xyplex MX1620?
Date: 08 Oct 1994 22:38:13 GMT
Organization: HeadCandy Associates... Sweets for the lobes.
Lines: 38
Message-ID: <MICHAELV.94Oct8173816@MindBender.HeadCandy.com>
References: <1994Oct6.153307.1@wittenberg.edu>
NNTP-Posting-Host: mindbender.headcandy.iastate.edu
In-reply-to: mandrews@wittenberg.edu's message of 6 Oct 94 15:33:07 -0400
In article <1994Oct6.153307.1@wittenberg.edu> mandrews@wittenberg.edu (Mike Andrews, Comp Ctr) writes:
I am looking at High Speed Modems (V.34) and was wonder which ones work
best with FreeBSD. Does it matter which modem I get (I know it matters for
connection speed and accuracy but I'm refering to how the OS deals with
the data transfer)
What I am thinking about getting is an external USR Sportster or Courier
and a Hayes ESP Enhanced Serial I/O card. (Like a 16540 with a 1K buffer)
Will that even work under FreeBSD or am I better off getting a regular
16540 I/O card or internal Modem.
The Hayes ESP card is definitely the way to go. You're going to want
to run your serial port at 115200 bps, and even a 16550 on a decent
machine will miss characters sometimes at that speed (like if it's
really busy doing other things).
I have two Practical Peripherals V.Fast/V.34 modems and a Hayes ESP
card for both of them, and I run PPP over them. Granted I run it
under NetBSD, but I don't think that should make a big difference. I
started out with a 16550 card, and just didn't like the fact that
characters were getting dropped, because that would put lags in the
network response. Since I have gotten the ESP cards, I haven't gotten
*one*single* overflow, and the remote machine on my link is a piddly
slow 386/25 -- I run both ends at 115200 bps.
The ESP cards "Just Work" with the NetBSD com driver. I assume they
should do the same under FreeBSD, although the serial drivers between
the two systems are radically different. Don't even think for a
second about running a 16450 at 115200 baud.
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Michael L. VanLoon michaelv@HeadCandy.com michaelv@iastate.edu
Free your mind and your machine -- NetBSD free un*x for PC/Mac/Amiga/etc.
Working NetBSD ports: 386+PC, Mac, Amiga, HP300, Sun3, Sun4c, PC532
In progress: DEC pmax (MIPS R2k/3k), VAX, Sun4m
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