Date: Wed, 28 Jun 2000 10:12:07 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: steinyv <steinyv@skyweb.net> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: SCSI Message-ID: <Pine.BSF.4.05.10006281008400.27226-100000@semuta.feral.com> In-Reply-To: <4.2.0.58.20000628124941.009ad100@>
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It's a signal level issue, not a performance issue. Rather than TTL -5v to 0v at 40ma, it's +5/-5 (IIRC) with micro-electric chair amperage. The only practical effect of using differential is you can run a *much* longer cable. Do *not* mix non-differential or differential devices. Devices have gotten more resilient, but you could certainly fry things that way. Note that LVD (low voltage differential) is a different thing entirely. I won't go into that- check any one of the HBA or Drive vendor's websites- you'll find overviews of that there (or see http://www.ultra160-scsi.com for Ultra3). On Wed, 28 Jun 2000, steinyv wrote: > Please excuse me, but does a differential scsi card differ from a regular > one, in what way? Could I use them with FBSD? What should I look out for? > Thank You gurus > :) > > _________________________________________ > Steiny's Studio > Pachyderm Productions > http://steiny.hypermart.net > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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