[5171] in linux-scsi channel archive
Re: Termination questions
daemon@ATHENA.MIT.EDU (Andy Poling)
Thu Nov 19 04:51:00 1998
Date: Wed, 18 Nov 1998 13:42:49 -0500 (EST)
From: Andy Poling <andy@globalauctions.com>
To: Steven Saner <ssaner@southwind.net>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19981117141548.D3132@jasper.southwind.net>
On Tue, 17 Nov 1998, Steven Saner wrote:
> A friend of mine told me that some of the newer cards would not
> require such a terminator and that I should try it without.
Some friend... :-)
SCSI (like every other bus I know of) requires termination at _both_ ends of
the bus... always.
If your last device (in this case, the tape drive) cannot provide it, then
you must add a terminator after it.
Sometimes it's a good idea to disable the internal terminator on the device
and use an external terminator anyway, since you can then use a
forced-perfect active terminator (in the case of single-ended SCSI). Most
internal termination seems to be simple passive resistor-pack terminators -
not as effective as a forced-perfect active terminator.
-Andy
Global Auctions
http://www.globalauctions.com
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