[5177] in linux-scsi channel archive
Re: Termination questions
daemon@ATHENA.MIT.EDU (Matthias Andree)
Thu Nov 19 06:01:54 1998
Date: Wed, 18 Nov 1998 23:02:34 +0100
From: Matthias Andree <mandree@sx1.HRZ.Uni-Dortmund.DE>
To: linux-scsi@vger.rutgers.edu
Mail-Followup-To: linux-scsi@vger.rutgers.edu
In-Reply-To: <19981117141548.D3132@jasper.southwind.net>; from Steven Saner on Tue, Nov 17, 1998 at 02:16:15PM -0600
On Tue, Nov 17, 1998 at 02:16:15PM -0600, Steven Saner wrote:
> 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.
You will definitely need a terminator for the tape drive, since it's at
the physical end of your chain (as is your Mylex). Your Mylex
terminates the bus, but your tape probably does not since. Check with
the jumper section of your tape drive manual, and if you cannot find
any hints about termination, you will definitely need a terminator for
your ribbon cable. That is: plug the terminator into the last plug of
your ribbon cable and the tape into the last but one plug.
--
Matthias Andree
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