SCSI termination... .

[ray.vigneau@ENEST.COM (Ray Vigneau)]

-�SCSI termination is a black art.  It is often the case that an
-�incorrect configuration will work perfectly.

   I have been working with SCSI for the past year on a recording
system my company manufactures. I have also attended a seminar
on SCSI cabling.  I am NOT an expert.  I agree with the statement
that SCSI termination is important and will sometimes work with
incorrect methods but may be unreliable.
Here are a few tips:

1) The host SCSI card should always be on one end of the bus.  A
   termination must also be on the host card.

2) The last device in the daisy chain should have termination also.

3) No other device in the chain should have termination.

4) The termination resistors need power from ONLY one source.
   It should be refered to as termpower.  If the host supplies it
   on the controller card don't supply it on the last device.

5) The cables leading from device to device should not have Y cables.
   The SCSI devices should be as inline as possible.  The longer the
   line from the device to the actual bus the more the chance of error.

   Sometimes the flake-E system is caused by correcting the problem the
wrong way.  If the problem is that there is termpower supplied on both
ends you shouldn't fix it by removing the terminators from one end.
If there are more questions I can answer I can consult my team of experts
at work and get back with an answer.  RAY.VIGNEAU@ENEST.COM
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