[4439] in linux-net channel archive
Re: SCSI -Reply
daemon@ATHENA.MIT.EDU (Leonard N. Zubkoff)
Mon Sep 16 15:18:05 1996
Date: Mon, 16 Sep 1996 08:47:28 -0700
From: "Leonard N. Zubkoff" <lnz@dandelion.com>
To: drew@poohsticks.org
Cc: BUTTLES@inet.champlain.edu, ALAN@lxorguk.ukuu.org.uk,
LINUX-NET@vger.rutgers.edu
In-Reply-To: <199609160603.AAA29201@chopper.poohsticks.org> (message from Drew
Eckhardt on Mon, 16 Sep 1996 00:03:35 -0600)
Date: Mon, 16 Sep 1996 00:03:35 -0600
From: Drew Eckhardt <drew@poohsticks.org>
It depends on what you mean by "SCSI" and "very short". SCSI-II allows for
a 6 meter cable length in single ended installations; and 25 in differential.
Actually, Fast SCSI-2 only allows for 3 meters. 6 meters is correct for slow
SCSI (5.0 mega-transfers/second).
I believe much less (3.0 meters rings a bell, but don't quote me) is
allowed for in FAST20, UltraSCSI, or whatever they're now calling the
20MHz (and proposed 40MHz) parallel standards.
Ultra SCSI allows 3 meters if you have 4 or fewer devices on the bus; with more
than 4, it goes down to 1.5 meters.
Leonard
