[5185] in linux-scsi channel archive
Re: Termination questions
daemon@ATHENA.MIT.EDU (Steven Saner)
Thu Nov 19 19:03:24 1998
Date: Thu, 19 Nov 1998 08:18:25 -0600
From: Steven Saner <ssaner@southwind.net>
To: linux-scsi@vger.rutgers.edu
In-Reply-To: <19981118230234.B3768@emma1.hrz.uni-dortmund.de>; from Matthias Andree on Wed, Nov 18, 1998 at 11:02:34PM +0100
I want ahead and tried the tape drive without a terminator, because I
can't find one locally, and it seems to work fine. I suppose that is
because it is the only device on the chain and it is running at 5
MHz. Nevertheless, I plan to get a terminator to reduce possibilities
of future problems.
Thanks for all the good advice.
On Wed, Nov 18, 1998 at 11:02:34PM +0100, Matthias Andree wrote:
> 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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--
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