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Wiring Notes
Wire — What to
DO
1.
DO
use point-to-point Unshielded Twisted Pair wire, gauge 24 or
thicker, stranded or solid, Category 2, 3, 4, or 5.
2. The video signal may co-exist in the same wire bundle as other
video, telephone, data, control signals, or low-voltage power. It
is also OK to run NVT video signals in or near electromagnetic
fields (in accordance with National Electrical Code, local, or other
local safety requirements).
3.
DO
measure the wire distance. Use only transceivers that are
designed for that distance.
4.
DO
make sure the pair of wires carrying the video signal is sent
as a twisted pair (e.g. the blue-white/white-blue wires twisted
together as a pair), not a “split-pair” (e.g. blue-white conductor,
part of one pair/orange-white conductor, part of another pair).
Wire — What NOT to DO
1.
DO NOT USE SHIELDED TWISTED PAIR WIRE.
It will
severely degrade the distance performance. Short runs may be
used with some signal degradation (for example elevator traveler
cables). Multi-pair wire with an overall shield is OK.
2.
DO NOT USE UN-TWISTED WIRE.
It will reduce the NVT
product’s inherent interference immunity.
3.
DO NOT
allow your installation to have “bridge-taps”, loading
coils, talk-battery, or MOV type protectors. Bridge-taps are where
a twisted pair is connected to two twisted pairs (such as an
extension phone at home). Bridge-taps cause reflections as the
signal propagates, resulting in “ghosts” in the video image, and
are to be avoided.
4. If the phone company is providing the cable runs between
buildings, make sure it’s “dry copper” i.e. it should have none
of the following: dial-tone, 48 volts, loading coils, bridge-taps,
switching, or long paths to the phone company’s central office
and back.
5. Due to near-end crosstalk,
DO NOT
send a transmit and a
receive signal in the same wire bundle. Exceptions: Less than
1,000 ft (300m), or Category 5 cable, up to 2,000 ft (600m) are
OK.
6.
DO NOT
send “Up-the-Coax” Pan/Tilt/Zoom signals through
active (amplified) NVT transceivers.
Measure your wire distance
Note: All NVT quoted distance specifications include any coax in the
run. It is recommended that the wire distance be measured to ensure
that the capability of the NVT product is correct.
Wire resistance may be measured with an ohm-meter by shorting
the two conductors together at the far end, and measuring the loop-
resistance out and back. Compare your readings with the charts on
the next page.
ADDENDUM 1
The cameras included in the Warrior series are able to transmit video
signals to NVT receivers via unshielded twisted pair cable. You must
purchase the receiver separately. Instructions for connecting the
receiver end of the unshielded twisted pair cable will be included
with the NVT receiver. Following are instructions for connecting the
unshielded twisted pair cable to the PC board inside your Warrior
housing. See the TROUBLESHOOTING section in the back of these
instructions if you experience any problems.
UNSHIELDED TWISTED PAIR
VIDEO WIRING
7. For safety, never put NVT signals in the same conduit as
high-voltage wiring.
8.
WARNING
— to reduce a risk of fire or electrical shock, do
not expose this product to rain or moisture.
!
!
1. Connect the unshielded twisted pair cable to the positive and
negative screw terminals on the Warrior PC board (Figure 19).
2. Connect the other end of the unshielded twisted pair cable to the
NVT receiver.
CAUTION:
The unshielded twisted pair video signal is polarity
dependent. The positive video terminal on the
Warrior PC board MUST be connected to
the positive terminal on the NVT receiver, and
negative MUST be connected to negative.
3. When using unshielded twisted pair cable you DO NOT need the
BNC connector. Be sure that there is no video connection other
than the unshielded twisted pair cable.
Video Negative (-)
Video Positive (+)
Figure 19
NOTE:
The customer must purchase the Video Transceiver from
NVT. Part numbers are:
• NV-212A (500 ft.)
* NV-213A or NV-213A-M (1000 ft.)
• NV-652R, NV-862R, or NV-1662R (3000 ft.)
PC Board
