[SunRescue] Re: ObQuestion

[Ken Hansen]

http://www.pc-pitstop.com/products/terminators.asp

50 pin Diff Terminators, $5 ea.

68 pin Diff Terminators, $10 ea.

Ken

----- Original Message -----
From: "Robert Rose" <rr at rits.com.au>
To: <rescue at sunhelp.org>
Sent: Thursday, May 10, 2001 5:19 AM
Subject: [SunRescue] Re: ObQuestion


>
> >
> >From: "Loomis, Rip" <GILBERT.R.LOOMIS at saic.com>
> >
> >ObQuestion:
> >I've never played with differential SCSI-2 before,
> >but I've just been handed an SBus wide differential
> >plus Ethernet card.  Any things I should know about
> >cabling/termination differences between this and
> >regular FW/SE SCSI?
>
> Yep, there are similarities and differences.  As long as you use wide or
> narrow cables, there is no effective difference between Differential and
> Single Ended, they're wired "straight through".  There is a difference in
> length, differential can be *heaps* longer than SE.
>
> SCA throws an interesting twist, there are differences between SE and Diff
> such that a regular (SE) SCA to 50/68 pin adaptor isn't supposed to work
> with a Diff SCA disk and controller.  There are Diff specific SCA to 50/68
> pin adaptors priced at a premium above the SE variants, probably because
> they're less popular.  Hands up if you've ever used a Diff SCA disk.....
> not many I bet.  I didn't even know such a beastie existed 'till I picked
> some up at auction.  Seagate don't even acknowledge they exist on their
> website.
>
> Termination is different between SE and Diff, they're not
> interchangable.  The Seagate drives I've seen (narrow, wide and SCA) don't
> even have an option of termination like the SE drives do, so you're stuck
> trying to find an external one.
>
> Does anyone that's bothered to read this far know where I can find a cheap
> 68 pin Diff SCSI terminator?  I've got the drives, I've got the
controller,
> I just need to terminate the damn bus.  I've got a 50 pin terminator, but
> I'd really like to get the whole bus running Wide instead of narrow.
>
> cheers,
>
> Rob.
>
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