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