From owner-freebsd-current Sat Jun 21 17:45:00 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id RAA28799 for current-outgoing; Sat, 21 Jun 1997 17:45:00 -0700 (PDT) Received: from whizzo.TransSys.COM (whizzo.TransSys.COM [144.202.42.10]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id RAA28794 for ; Sat, 21 Jun 1997 17:44:56 -0700 (PDT) Received: from localhost.transsys.com (localhost.transsys.com [127.0.0.1]) by whizzo.TransSys.COM (8.8.5/8.7.3) with SMTP id UAA25091; Sat, 21 Jun 1997 20:41:18 -0400 (EDT) Message-Id: <199706220041.UAA25091@whizzo.TransSys.COM> X-Mailer: exmh version 2.0delta 6/3/97 To: Terry Lambert cc: adam@veda.is, joerg_wunsch@uriah.heep.sax.de, freebsd-current@FreeBSD.ORG From: "Louis A. Mamakos" Subject: Re: getty modem control References: <199706212105.OAA27805@phaeton.artisoft.com> In-reply-to: Your message of "Sat, 21 Jun 1997 14:05:10 PDT." <199706212105.OAA27805@phaeton.artisoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sat, 21 Jun 1997 20:41:17 -0400 Sender: owner-current@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > You can't reliably run the computer-modem rate at a higher rate > that the modem-modem rate. Conversely, you can't reliably run > the modem-modem rate at a higher rate than the computer-modem > rate. That's news to me; I routinely ran a serial port at 38.4 kb/s with CTS/RTS hardware flow control with a V.32 (14.4kb/s) modem, and it worked just fine. As I was using it for SLIP, I knew there were no overruns because there were no IP, TCP or UDP checksum errors. > This is because of issues of bufferring, and when common UART > chips trigger interrupts relative to their FIFO size. I do not dispute broken hardware, but it's not all universally busted. > The last modem you could reliably run at differential speeds was > the original MNP Microcom modems; they had huge buffers. This was on a ZyXEL 1496 modem. > Link-level compression is evil anyway; compression belongs on > the host side of the host UART so that the datarate is not > limited by the serial port rate. I disagree. Given that the modem is already doing V.42 link-level reliablity, it fits in very nicely with it's segmentation. louie