Wiring Notes - Moog Videolarm QView QFDPT3-50NA User Manual

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.
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.
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 in
the next column.
Unshielded Twisted-Pair Wire Gauge (AWG)
Cable
18
Distance
250 ft 3
Ω
300 ft 4 Ω
400 ft 5 Ω
500 ft 6 Ω
600 ft 8
Ω
800 ft 10
Ω
1000 ft 13
Ω
1250 ft 16 Ω
1500 ft 19 Ω
1750 ft 23 Ω
2000 ft 26
Ω
2500 ft 32
Ω
39
3000 ft Ω
3500 ft 45 Ω
4000 ft 52 Ω
5000 ft 65 Ω
6000 ft 78
Ω
8000 ft 104
Ω
Unshielded Twisted-Pair Wire Gauge (AWG)
Cable
18
Distance
75 m 3 Ω
4
100 m Ω
125 m 5
Ω
150 m 6 Ω
200 m 9 Ω
300 m 13
Ω
400 m 17
Ω
500 m 21 Ω
26
600 m Ω
750 m 32
Ω
900 m 38 Ω
1000 m 43 Ω
1200 m 51
Ω
1500 m 64
Ω
1800 m 77 Ω
2400 m 102 Ω
Unshielded Twisted-Pair Wire Gauge (mm)
Cable
1.0
Distance
75 m 3
100 m 4
6
125 m
150 m 7
200 m 9
300 m 13
400 m 18
500 m 22
600 m 26
750 m 33
900 m 40
1000 m 44
1200 m 53
66
1500 m
1800 m 79
2400 m 106
- 5 -
19 20 22 24
4 5 8 13
Ω Ω Ω Ω
5 Ω 6 Ω 10 Ω 16 Ω
6 Ω 8 Ω 13 Ω 21 Ω
8 Ω 10 Ω 16 Ω 26 Ω
10 12 19 31
Ω Ω Ω Ω
13 16 25 42
Ω Ω Ω Ω
16 20 32 52
Ω Ω Ω Ω
20 Ω 25 Ω 40 Ω 65 Ω
24 Ω 30 Ω 48 Ω 78 Ω
28 Ω 35 Ω 55 Ω 91 Ω
32 40 63 104
Ω Ω Ω Ω
40 49 79 131
Ω Ω Ω Ω
48 59 95 157
Ω Ω Ω Ω
56 Ω 69 Ω 111 Ω 183 Ω
64 Ω 79 Ω 127 Ω 209 Ω
80 Ω 99 Ω 158 Ω 261 Ω
95 119 190 313
Ω Ω Ω Ω
127 158 253 418
Ω Ω Ω Ω
19 20 22 24
4 Ω 5 Ω 8 Ω 13 Ω
5 6 10 17
Ω Ω Ω Ω
7 8 13 21
Ω Ω Ω Ω
8 Ω 10 Ω 16 Ω 26 Ω
10 Ω 13 Ω 21 Ω 34 Ω
16 19 31 51
Ω Ω Ω Ω
21 26 42 69
Ω Ω Ω Ω
26 Ω 32 Ω 52 Ω 86 Ω
31 39 62 103
Ω Ω Ω Ω
39 49 78 129
Ω Ω Ω Ω
47 Ω 58 Ω 94 Ω 154 Ω
52 Ω 65 Ω 104 Ω 171 Ω
63 78 125 206
Ω Ω Ω Ω
78 97 156 257
Ω Ω Ω Ω
94 Ω 117 Ω 187 Ω 309 Ω
125 Ω 156 Ω 249 Ω 411 Ω
0.8 0.7 0.6 0.5
5 6 9 13
Ω
7 9 12 18 Ω
8 11 15 22
Ω
10 13 18 27
Ω
13 17 24 36 Ω
20 26 36 54 Ω
27 35 48 72
Ω
33 43 60 90
Ω
40 52 72 108 Ω
50 65 89 135 Ω
60 78 107 162
Ω
66 86 119 179 Ω
80 104 143 215 Ω
100 130 179 269
Ω
120 155 215 323
Ω
159 207 286 431 Ω