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000341_owner-lightwave-l _Fri Jan 27 23:18:23 1995.msg
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Received: by mail3.netcom.com (8.6.9/Netcom)
id UAA22950; Fri, 27 Jan 1995 20:31:08 -0800
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From: Joseburgos@aol.com
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Date: Fri, 27 Jan 1995 23:30:37 -0500
Message-Id: <950127233036_1696811@aol.com>
To: lightwave-l@netcom.com
Subject: SCSI Terminator
Sender: owner-lightwave-l@netcom.com
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You do need to terminate a SCSI chain. The electronics that power the SCSI
bus will not transfer data propely because of the impedence mis-match. This
causes a lower output (voltage) level thus lower/slower data transfer. FYI
all electronic devices are terminated. If not they would not function or at
best not function well. I guess the best way to visualize it would be to
compare it to your video output going to a monitor and then looping to your
VTR not terminated. Most of us have had this happen and quickly see a
saturated screen. This is caused by the same impedence mis-match, thus giving
an uncalibrated or better un-calculated output level. Also, depending on the
actual electronic componet being used as the output, you can damage the
component because of running it in a un-efficent manner. A lot of components
will overheat and eventually fail.
Now don't panic most of our equipment is stupid prof and has circuitry to
prevent "Thermal Runaway" from lack of termination. All this does is allow
the unit to work at un-desireable level. This could also be the problem with
the person how has been told that his levels are over 100 or 1VPP. So always
terminate your circuit , SCSI, video, stereo or any.
Soory about the Electronics 101 course but I hate when someone is talking as
if he knows what he's saying and on top of that giving bad advice.