Path: utzoo!news-server.csri.toronto.edu!cs.utexas.edu!usc!trwind!gumby!deneva!elwood.coyote.trw.com!dave
From: dave@elwood.coyote.trw.com (Dave Agabra)
Newsgroups: comp.periphs.scsi
Subject: Re: Single-Ended vs Differential
Keywords: SCSI cables
Message-ID: <27E14AA4.5272@deneva.sdd.trw.com>
Date: 15 Mar 91 22:28:51 GMT
References: <3246@legs.UUCP> <1991Mar13.000459.23789@actrix.gen.nz>
Sender: news@deneva.sdd.trw.com
Organization: TRW Inc., Redondo Beach, CA
Lines: 16


    In section 4.1 of the SCSI-2 spec, it has a note that says that use of
single-ended drivers and receivers with the fast synchronous data transfer 
option is not recommended.  In section 4.8 it defines the fast data transfer
option as any data transfer having a transfer period of less than 200ns.  My
question is: Are people really abiding by this restriction?  It sounds like
some manufacturers are planning to go faster than 5MB/s on single-ended cables
even though it is not technically "legal".  Anyone know?

					---- Dave

--
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  A person should always believe in something.    dave@elwood.coyote.trw.com
  I believe I'll have another beer.               {cit-vax | trwrb}!wiley!dave
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