[7181] in linux-scsi channel archive
RE: Help with SCSI card
daemon@ATHENA.MIT.EDU (Marc SCHAEFER)
Wed Sep 8 04:59:17 1999
Date: Wed, 8 Sep 1999 10:50:40 +0200 (MEST)
From: Marc SCHAEFER <schaefer@alphanet.ch>
To: "Michael E. Kyne" <mekyne@paranet.com>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <000401bef977$b60bbe80$21e7fea9@mekyne.paranet.com>
On Tue, 7 Sep 1999, Michael E. Kyne wrote:
> How does one go about testing these adapters to determine if they do
> properly terminate the High Lines?
I didn't do the job in my company for this problem, however, a few hints:
- when converting from 68 to 50, the 68 side should not have the
lines connected together and grounded, they should be terminated to
a resistor pack, possibly with a voltage regulator if it's active.
- _active_ termination usually has resistors (packs) AND a voltage
regulator IC
One easy way is to open the connector. Another is to check connectivity
with a voltmeter/ohmmeter.
Typical 68/50 converters will work only reliably if the whole bus is 50.
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