From owner-freebsd-hardware Sat Jun 29 19:18:26 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id TAA04277 for hardware-outgoing; Sat, 29 Jun 1996 19:18:26 -0700 (PDT) Received: from who.cdrom.com (who.cdrom.com [204.216.27.3]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id TAA04254; Sat, 29 Jun 1996 19:18:20 -0700 (PDT) Received: from zoo.toronto.edu (zoo.toronto.edu [128.100.72.1]) by who.cdrom.com (8.6.12/8.6.11) with SMTP id LAA17855 ; Sat, 29 Jun 1996 11:31:33 -0700 Date: Sat, 29 Jun 1996 14:30:28 -0400 (EDT) From: Henry Spencer Subject: Re: muliport boards - building a PPP dialup server To: "Jacob M. Parnas" cc: Gary Palmer , hardware@FreeBSD.ORG, bsdi-users@bsdi.com In-Reply-To: <199606291317.JAA07529@jparnas.cybercom.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hardware@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk > I thought the question was on what to expect from UARTS for high speed > applications. I think Henry suggested using a local ethernet to connect to > a ISP ethernet <-> ethernet<->ethernet WAN ISDN connection or high > speed modem <-> home ethernet. Just to clarify... My suggestion is that you do not want a high-speed application which looks like a UART to the software, at all, ever. You want high-speed applications to come in via Ethernet, so your software is dealing with a packet at a time rather than a character at a time. It's worth the overhead of having to set up a 0.5m-long Ethernet, which is fairly trivial nowadays. Yes, there are people who build high-speed interfaces that look like UARTs, and they can be cheaper than the ones that sit on the other side of an Ethernet. You get what you pay for. Henry Spencer henry@zoo.toronto.edu