Date: Wed, 12 Jan 2000 19:33:10 +0100 From: Wilko Bulte <wilko@yedi.iaf.nl> To: Matthew Jacob <mjacob@feral.com> Cc: Andrew Gallatin <gallatin@cs.duke.edu>, freebsd-scsi@freebsd.org Subject: Re: 68 <-> 80 pin SCSI converter Message-ID: <20000112193310.A836@yedi.iaf.nl> In-Reply-To: <Pine.BSF.4.05.10001120718240.92347-100000@semuta.feral.com>; from mjacob@feral.com on Wed, Jan 12, 2000 at 07:22:09AM -0800 References: <14460.38703.454117.921172@grasshopper.cs.duke.edu> <Pine.BSF.4.05.10001120718240.92347-100000@semuta.feral.com>
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On Wed, Jan 12, 2000 at 07:22:09AM -0800, Matthew Jacob wrote: > > > > > I apologize for what may be a fairly silly question: Is there any > > clean way to attach a 68-pin drive to an 80-pin SCA backplane? > > > > My group is purchasing a server-class box which comes with an U2 > > hot-pluggable backplane with 80-pin SCA connectors. We are hoping > > to reuse some existing 68-pin U2 cheetahs from another machine. > > > > I have looked for 68-80 pin converters for a while & all I can find > > are adapters which allow you to attach an 80-pin SCA drive to a 68-pin > > cable. I have not found any method for attaching a 68-pin drive to an > > 80-pin SCA backplane. Does such a best exist? > > I'd try http://www.amp.com to get a part no, if it exists, and then search > around for someone who'll sell it. I'd also check Kingston- the folks who > make slide rail carriers may have this. > > I'd doubt that this is a great idea because the whole point of SCA is it > combines signal power and mounting in one deal- to go form SCA, you'll > have to come out with both the MOLEX +5/+12 connector, the 68 pin cable To add to the grief: you loose any 'topological' SCSI IDs. Meaning that SCA sets it's SCSI ID based on the slot of the backplane. One could invent wiring to do this right but I've never seen such an adapter. > connector, and it won't necessarily have the right mounting and any length > of 68 pin longer than 50mm is gonna add signal noise. Stubs on the signal lines are indeed also a bad idea. -- Wilko Bulte Arnhem, The Netherlands - The FreeBSD Project WWW : http://www.tcja.nl http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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