Date: Fri, 28 Jun 1996 15:56:19 -0400 From: "Jacob M. Parnas" <jparnas@jparnas.cybercom.net> To: Chuck Robey <chuckr@glue.umd.edu> Cc: Kevin Swanson <Kevin_Swanson@blacksmith.com>, freebsd-hardware@freebsd.org Subject: Re: muliport boards - building a PPP dialup server Message-ID: <199606281956.PAA04592@jparnas.cybercom.net> In-Reply-To: Your message of Fri, 28 Jun 1996 15:45:25 EDT. <Pine.OSF.3.91.960628154114.1057E-100000@thurston.eng.umd.edu>
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In message <Pine.OSF.3.91.960628154114.1057E-100000@thurston.eng.umd.edu>you write: >On Fri, 28 Jun 1996, Jacob M. Parnas wrote: > >> >> In message <Pine.OSF.3.91.960628143531.1057C-100000@thurston.eng.umd.edu>you write: >> >On Fri, 28 Jun 1996, Kevin Swanson wrote: >> > >> >> I was told by Digi that their "dumb" 8-port boards (PC/8), could only go up >> >> to 19.2 KBps if you used 16550's. This doesn't sound right based on some of >> >> the responses I've been getting. >> >> These days, a multiboard should at least do 115200baud in my opinion. At >> least it can be competitive with modems. 8x115200baud is still only 1/8 >> MB/sec and 16x115200 is only 1/4 MByte/sec. Not exactly fast. > >You notice he referred to the "dumb" 8 port digiboards? They were much >cheaper than the intelligent ones, and serve many applications perfectly >well, but since they have no onboard intelligence or buffering (beyond >that allowed by the 16550 fifos) they won't make it to 115200, at least >not on all 8 ports at the same time. 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. Jacob
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