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Twisted-Pair Cable
Caution: Careful selection of the proper cable is essential to obtain the best performance from this
equipment. Vicon assumes no responsibility for poor performance when cables other than
those recommended are installed.
Materials
Use a pure copper stranded or solid conductor with or without a tin plating to obtain a low DC resistance. Do not use cable
with either steel or aluminum stranded conductor because these do not transfer signals effectively for long distances. The
preferred insulation is Polyvinyl chloride (PVC). It has better electrical characteristics than polyethylene and resists flames,
sunlight and most solvents, but is more vulnerable to moisture.
Cable Types
The most commonly used cable types are point-to-point unshielded twisted pair wire, stranded or solid, unjacketed,
24 gauge or thicker. They can be category 2, 3, 4, or 5. 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 acceptable to run the signal adjacent to fluorescent
lights or other power sources (in accordance with National Electrical Code, local and other safety requirements). Make
sure the pair of wires carrying the video signal is sent as a twisted pair (the blue-white/white-blue wires twisted together as
a pair), not a "split pair" (blue-white conductor, part of one pair/orange-white conductor, part of another pair).
Choose a Belden or equivalent cable type by referring to the characteristics and maximum distances listed below. The
characteristics of the cables in the Tables should be used as a guideline when cables other than Belden are used.
Materials and construction must follow the guidelines above.
Wire resistance may be measured with an ohmmeter by shorting the two conductors together at the far end and
measuring the loop-resistance out and back. Compare your readings to the following chart.
Distance ft (m)
250 (76)
315 (96)
397 (121)
500 (152)
630 (192)
794 (242)
1000 (305)
1260 (384)
1587 (484)
2000 (610)
Note: All quoted distance specifications include any coaxial cable in the run. It is recommended that the wire distance be
measured to ensure that the capability of the product is correct.
Cable Type
Wire Size
(AWG)
Belden1721X
24, Solid
14 • 9BReference
Wire Distances
Wire Gauge AWG
18
3Ω
4Ω
5Ω
7Ω
8Ω
10Ω
13Ω
16Ω
21Ω
26Ω
Recommended Unshielded Twisted-Pair Cable Type
Insulation Material Conductor Type
Polyethylene
XX137-60-00 Rev 109 Roughneck V910 Dome Cameras with WDR
20
5Ω
6Ω
8Ω
10Ω
13Ω
16Ω
20Ω
25Ω
32Ω
40Ω
Resistance (ohms)
Bare Copper
22
24
8Ω
13Ω
10Ω
16Ω
13Ω
21Ω
17Ω
26Ω
21Ω
33Ω
26Ω
41Ω
33Ω
52Ω
42Ω
66Ω
52Ω
83Ω
66Ω
104Ω
Number of
Twisted Pairs
100
1
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