Ultra160 SCSI same as LVD?

[c0r3file]

Hey all,

I have an Ultra160 scsi controller on my mobo. Is that the same as LVD (low voltage differential)? I think Ultra2, Ultrawide, and Ultra160 are all part of the scsi3 standard, but I'm not sure. Mainly I want to know if I buy an LVD device if it will talk to this Ultra160 without problems...

thanks!

:)

c0r3file

[vibe666]

Ultra160 SCSI is a type of LVD Drive like a Testarossa is a type of Ferrarri.

Ultra160 is always an LVD Drive but not all LVD Drives are Ultra160. Does that make sense? LVD is a type of SCSI bus along with the older (possibly) more common 'Single-Ended' SCSI Bus.

There is quite a good explanation of SCSI types at The Mac Guru's SCSI Pages of Doom (http://www.macgurus.com/products/drives/mgwhichscsiadapters4).

Hope that helps.

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[Peter M]

LVD is an electrical property, low voltage differential signalling. Everything producing transfer rates labelled U2W, U160 or U320 uses it.

regards, Peter

[smaier69]

good show, Peter.

one of the traits of LVD signalling (uses pairs of wires carrying signals/waves 180° out of phase - hence, differential - from their counterpart to cancel out noise) is that it has a much cleaner output, and therefore the distarnce between devices can be much longer.

this is a reach, here.... but if i remember correctly, old SCSI archetectures used 5v (high voltage), and LVD is 3.3v (low voltage).

[Peter M]

Legacy SCSI can either be single-ended or high voltage differential. The latter wasn't too popular since it required special host adapters and devices. LVD in turn is backward compatible to single-ended, in that when you add one SE device (or host adapter) to an LVD chain, the entire chain falls back to SE, no harm done - other than for performance and cable length restrictions of course.

regards, Peter