Date: Thu, 24 Oct 1996 22:28:36 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: msmith@atrad.adelaide.edu.au (Michael Smith) Cc: sysseh@devetir.qld.gov.au, hardware@freebsd.org Subject: Re: Setting up an actively terminated SCSI chain. Message-ID: <199610250528.WAA09322@GndRsh.aac.dev.com> In-Reply-To: <199610250240.MAA16271@genesis.atrad.adelaide.edu.au> from Michael Smith at "Oct 25, 96 12:10:36 pm"
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> Stephen Hocking stands accused of saying: > > > > I have the following equipment - > > > > 1 swish cable with the active terminator stuff at the end. > > 1 mouldy old 1542B controller > > 1 Seagate Barracuda (2Gb, narrow) > > 1 Tandberg TDC 3800 QIC-525 > > 1 Micropolis 1684-7 drive (330Mb). > > > > I have a handbook for the barracuda which talks about what jumpers to set for > > active/nonactive termination & who supplies termination power to the bus. I > > don't have a manual for the tape drive, the Micropolis came out of a system > > that was using active termination (so I don't have to worry about it!), so > > what I was wondering was > > > > a) does anyone know where I could get a sheet for the tandberg drive > > You shouldn't need one; the shiny silver label on the back should have the > jumper assignments on it. Check the drive to see if it has SIP sockets; > if so, it's a passive-termination device and you can rip the resistor > packs (if there are any there). > > > b) How to set the whole mess up to use active termination. > > Put the 'cuda at one end, set it for active termination. Put the > 'swish cable' at the other end. Put everything else in the middle, with > termination turned off. Rip the resistor packs from the 1542; make sure it > is supplying terminator power. All correct except for one small detail, also make sure the baracuda is suppling termination power on it's own. It is best to have the term power supplied by the closests device since term power over the scsi cable will invariable have noise on it caused by mutual induction and capacitative coupling in the cable itself. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation, Inc. Reliable computers for FreeBSD
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