Nitek VB31M - Manual (Page 4)

Installation & Setup
Unshielded Twisted Pair
(Loop Resistance at 750 feet)
AWG 23 24
Loop Resistance 32 Ohms 39 Ohms
Mounting
The VB31M 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 VB31M externally, the placement should be sufficiently close to the camera
housing so that the mini-coax cable can be conveniently routed into the camera housing. The
mounting leg of the VB31M can be used to secure the device either with a screw or wire wrap.
The mini-coax plugs onto the BNC camera video input.
When mounting the VB31M inside a camera housing a hole of sufficient size must be available
to pass the RJ45 terminated 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 VB31M devices are used; one at the Head-End (monitor loca-
tion) 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.