Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!rice!sun-spots-request
From: derrick@cs.athabascau.ca (Derrick Rowlandson)
Newsgroups: comp.sys.sun
Subject: SCSI help requested
Keywords: Hardware
Message-ID: <5156@brazos.Rice.edu>
Date: 20 Feb 90 03:24:40 GMT
Sender: root@rice.edu
Organization: Sun-Spots
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X-Sun-Spots-Digest: Volume 9, Issue 51, message 6

After spending a couple hours trying to cable up some SCSI peripherals to
a SUN i would like to pose the following questions.

A SCSI bus consists of a 50 pin bus running from a SCSI controller.  Bus
length can be up to 15 feet.  On this bus you can have up to 8 devices.
Connectors for getting on the bus come in many different flavors,
(Centronics style, AMP-socket connectors, D style connector) Some SCSI
peripherals provide a bus extention to allow the bus to continue on to the
next device. This is simply a parallel extention of the bus.

So far so good?

Where must a SCSI bus be terminated? Only once, and at the last device on
the bus would seem to be the logical choise.

When taping into a SCSI bus, the tap or stub length can only be a few
inches in length i guess? But can you get away with a longer stub length
if you also terminate that specific device?


confirmation/correction/variations of the above would be greatly
appreciated, and any other cabling/hardware tips also welcome. (a tip on a
good hardware reference book also welcome).

   derrick@cs.AthabascaU.CA