> I am curious..... WHY and WHY is shield cables NOT ALLOWED?!
> =

> John.
> =


One reason is if the circuit driving and receiving the data signal is not =

floating with respect to the shield, then that circuit sees a lot higher =

capacitive load from the shield which may restrict cable lengths and/or =

communication speed.

Another reason is potential ground loops if the shield is connected at both =

ends (which it should be if it is to be of any use EMC wise). EX circuits, =
for =

example, should not have the shield connected at both ends when the cable i=
s =

connected between different zones.

/Ruben
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=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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=3D=3D=3D=3D=3D

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