On Fri, 19 Feb 1999, shevek wrote:
> > What's the story about SCSI terminators?
>
> SCSI has a start and an end. The start assumes the cable to have a certain
> impedance, which is the value it would have if the cable is endless. Any
> device not being the last should have impedance 0. This is not possible,
Oops! Any device should have impedance infinity. This is no possible, but
it will be very high!
If a device has impedance equal to 0, then it's a short-circuit, and the
signal will be reflected, and not reach the next devices!!!
> but it will be very low. The last device should still look like the cable
> is endless, iow the impedance should be the same as that of an infinitely
> long cable. That is what a terminator is. It adds this impedance to the
> cable. (Which explains the name: it terminates the cable) SCSI systems
> are quite stable. I have heard of people putting a terminator on every
> device, or none at all, and the system still works. But it should have one
> terminater at the end, and none at other places.
One terminator at each end.
Greetings from Brazil!
--------------------------------------------------------------
Marco Antonio Simon Dal Poz http://www.lsi.usp.br/~mdalpoz
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