Nitek VB31PT - Manual (Page 4)

Installation & Setup
Unshielded Twisted Pair
(Loop Resistance at 750 feet)
AWG 18 20 22 24
Loop Resistance 10 Ohms 15 Ohms 24 Ohms 39 Ohms
Mounting
The VB31PT can be mounted external to a camera housing by use of the mounting leg, or can
be placed inside the camera housing.
When mounting the VB31PT externally, the placement should be sufficiently close to the cam-
era housing so that the mini-coax cable can be conveniently routed into the camera housing.
The mounting leg of the VB31PT can be used to secure the device either with a screw or wire
wrap. The mini-coax plugs onto the BNC camera video input. The wires of the UTP cable must
be stripped 1/4” and inserted into the appropriate
+
and
-
Screwless terminals at the back of
the VB31PT. Be sure to maintain the same UTP polarity at both the transmit and receive units.
When mounting the VB31PT inside a camera housing a small hole must be available to pass
the UTP cable through. The cable must be of sufficient length to be routed back to the video
crossover. As with external mounting, the mini-coax video cable will connect within the housing
to the camera video BNC input..
Hook-Up
In the diagram shown above, two VB31PT devices are used; one at the Head-End (monitor lo-
cation) and the second at the camera location. No voltage is required for the baluns, since they
are passive devices. Video is sent back to the monitor over the UTP cable by means of the two
baluns operating as video transceivers.