Date: Fri, 28 Jun 1996 19:58:58 -0400 (EDT) From: Peter Dufault <dufault@hda.com> To: jparnas@jparnas.cybercom.net (Jacob M. Parnas) Cc: chuckr@glue.umd.edu, Kevin_Swanson@blacksmith.com, freebsd-hardware@FreeBSD.org Subject: Re: muliport boards - building a PPP dialup server Message-ID: <199606282358.TAA01026@hda.com> In-Reply-To: <199606281956.PAA04592@jparnas.cybercom.net> from "Jacob M. Parnas" at Jun 28, 96 03:56:19 pm
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> I think "dumb" ones should be able to go at least 115200 per port (for even > $120-$130 new modems. Smart ones should support at least 512kbaud/port.) > Some like ones based on the TI 17550 chip (I think) go up to > 900 Kbaud/sec. Probably, but I don't want to comment on things I don't know about. However: Using a Boca Board with 8 ports (no modem control, no smarts, 16550s) we have an application that does 115200 at 70% theoretical peak bandwidth utilization on four ports at 115200 with no dropped input, for four hours per data collection cycle. This is continuous. The data is uploaded from microcontrollers that are pumping it out at that rate with no pauses. The system is an Asus 486DX4-100 from Rod. -- Peter Dufault Real-Time Machine Control and Simulation HD Associates, Inc. Voice: 508 433 6936 dufault@hda.com Fax: 508 433 5267
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