Copyright© 2001, Alpha Communications®, All Rights Reserved.
AWD061 Rev. 2 (09/01)
The VDU-4 video distributor unit is designed to be used with
the S.T.R.™ video-intercom system(s) to provide multiple video
risers (lines) from a single camera video (coax) source. Each
VDU-4 provides up to four (4) amplified video outputs and a 5th
output that may be used to daisy-chain to an additional VDU-
4 unit (if required). Each VDU-4 is powered by a 12VDC-15VDC
1. Read installation instructions to determine equipment lo-
cation and installation method.
Install equipment and wiring.
3. Check wiring and connect. Observe all local and
national electrical codes.
4. Apply power and check operation.
HOUSING INSTALLATION AND
VDU-4 VIDEO DISTRIBUTOR
The VDU-4 is usually located in the 'central equipment location'
where the system amplifier/power supply is located. You can
mount the VDU-4 by using the provided plastic 'Din Rail'
mounting bracket. It must be located away from any source of
direct heat or extreme cold and in an accessible location. Keep
at least 3 feet (1 meter) away from transformers, light dimmers
or other electrical devices or wiring or sources of electrical
The model SS12C (or equivalent) 12VDC plug-in power supply
plugs into a conventional 117 VAC electrical outlet, within 100'
(30 meters) of the VDU-4, but no closer than 3 feet (1 meter) from
the VDU-4 amplifier.
NOTE: When using a conventional S.T.R.™ entry camera
unit, the camera is powered by 12VDC-15VDC, and the power
is applied to terminals marked 'B' and 'O'. When using this
type of camera, the first VDU-4 may be powered by the same
power source that connects to terminals 'B' and 'O'. Simply
run two (2) wires to terminals 'B' and 'O' on the VDU-4 unit
as well as the camera. POLARITY MUST BE OBSERVED.
Terminal 'B' is positive (+) and terminal 'O' is negative (-), at
all such connections! Each additional VDU-4 should be pow-
ered by a separate SS12C (or equivalent) power