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Article #68777Re: SEAGATE ST15150ND Barracuda...Is this a Differential??
From: Lawrence Kirby
Date: Thu, 25 Apr 1996 00:00
Date: Thu, 25 Apr 1996 00:00
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In article <3179BBB9.4249@nppd.com> mlstone@nppd.com "Matt Stoner" writes: >As I understand it, the differential doesn't have a ground line. A single-ended bus has a ground return for each signal A differential bus uses a differential pair of wires for each signal. For a "0" state one of the wires is high voltage and the other is low, for a "1" they swap around. The receiver uses the voltage difference between them to determine the signal state. This gives twice the relative voltage swing between states hence higher noise immunity. External interference will tend to affect both wires similarly and cancel out once the difference is taken. Fields generated by the two wires will also tend to cancel. > It uses >a fixed, non-zero voltage for both ends, reducing the effects of induced >voltage on the operation of the SCSI bus. That sounds like you are getting confused with active terminators. -- ----------------------------------------- Lawrence Kirby | fred@genesis.demon.co.uk Wilts, England | 70734.126@compuserve.com -----------------------------------------
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 10c6a1,4f773adcf2e735b7 X-Google-Attributes: gid10c6a1,public X-Google-Thread: 1036bc,4f773adcf2e735b7 X-Google-Attributes: gid1036bc,public X-Google-Thread: fbad3,4f773adcf2e735b7 X-Google-Attributes: gidfbad3,public From: Lawrence Kirby <fred@genesis.demon.co.uk> Subject: Re: SEAGATE ST15150ND Barracuda...Is this a Differential?? Date: 1996/04/25 Message-ID: <830433981snz@genesis.demon.co.uk> X-Deja-AN: 151359869 x-nntp-posting-host: genesis.demon.co.uk references: <829083915snz@longley.demon.co.uk> <829091313snz@longley.demon.co.uk> <316B23B9.313C@cris.com> <31748175.5059017@news.cris.com> <4l59b5$o51@neptun.DVS-Hannover> <3179BBB9.4249@nppd.com> x-mail2news-path: genesis.demon.co.uk organization: none reply-to: fred@genesis.demon.co.uk newsgroups: demon.tech.pc,comp.periphs.scsi,comp.periphs