[5172] in linux-scsi channel archive
Re: Termination questions
daemon@ATHENA.MIT.EDU (Steve Austin)
Thu Nov 19 04:52:26 1998
Date: Wed, 18 Nov 1998 18:47:44 +0000 (GMT)
From: Steve Austin <steve@edensfld.demon.co.uk>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19981117141548.D3132@jasper.southwind.net>
To: unlisted-recipients:; (no To-header on input)
On Tue, 17 Nov 1998, Steven Saner wrote:
There is termination of a sort on the drive, enabled by one of the jumpers
on the back. It's not very good - buy a proper active terminator. If you
don't have a spare connector on the ribbon cable, you can get pass-through
terminators. The bus must be terminated at both ends, or you will get an
unacceptable number of bus errors.
> I have what might be an elementary scsi question. I have a lot of
> hardware and electronics background, but I am new to scsi.
>
> I have an HP 5000i SureStore DAT drive and a Mylex BT-958 card. I also
> have a 50 pin ribbon cable to connect the two. My question is, do I
> need a terminator at the opposite end of the cable from the
> controller.
>
> The controller is auto-terminating, so it will take care of its end of
> the bus. According to its documentation, generally the device you are
> connecting it to will have built in termination that can be enabled or
> disabled. The tape drive documentation, however, does not indicate
> that it has internal termination. It suggests that you will need to
> put a terminator on the cable if the tape drive is the only, or last device.
>
> 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. I have not
> yet done that, but I wondered if someone has experience with this
> and could shed some light on it.
>
> Thanks
--------------------------------------------------------------------
Steve Austin steve@edensfld.demon.co.uk
http://www.edensfld.demon.co.uk for a really bad time.
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