HomeTech BVR-20 - Manual (Page 5)

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Grounding
If you use a shielded Cat-5 cable, then you need to be
careful about ground loops. In most instances only connect
the shield at the receive end of the balanced line and NOT
on the other end. This provides a ground/drain path for
noise picked up by the shield, but it prevents a continuous
ground path between the source and destination units.
Power Wiring
Important Note: The BVD-20 and BVR-20 operate from
a 24 volt AC wall plug transformer. There is no polarity on
the power wiring from the transformer so it can connect
either way to the connector block on the unit. The power
draw is very low on these units (each unit draws approxi-
mately 150 milliamps) so if necessary you can run as many
as two AudioControl BVD-20 / BVH-20 / BVR-20s from
one 24 VAC transformer.
Handy Tip: For remote applications the BVD-20, BVH-
20 and BVR-20 will work from a 12 volt battery supply.
There is a small decrease in the maximum audio signal
level headroom, but the video performance is unaffected by
the reduced supply voltage.
Cat-5 Wiring:
The RJ-45 connection on the BVD-20, BVH-20 and
BVR-20 conform to the EIA-568B standard. This is the
same Cat-5 cable wiring standard that a typical computer
network utilizes. You can use any existing 10/100Base-T
network cabling and patch bays in an installation as long
as it does not run through a router or hub. The Cat-5
wiring must run directly from the BVD-20 / BVH-20 to
the BVR-20.