Nikon XX152-02-00 - Manual (Page 30)

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.
aterials
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 e
gnals effectively for long distances. The
prefe and resists flames,
unlig
Cab
The able 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
rces (in accordance with National Electrical Code, local and other safety requirements). Make
sure r (the blue-white/white-blue wires twisted together as
pair), not a “split pair” (blue-white conductor, part of one pair/orange-white conductor, part of another pair).
and maximum distances listed below. The
haracteristics 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
i ing the two conductors together at the far end and
mea g s to the following chart.
Wire Distances
Wire Gauge AWG
M
ither steel or aluminum stranded conductor because these do not transfer si
rred insulation is Polyvinyl chloride (PVC). It has better electrical characteristics than polyethylene
ht and most solvents, but is more vulnerable to moisture. s
le Types
most commonly used c
or other power sou
the pair of wires carrying the video signal is sent as a twisted pai
a
Choose a Belden or equivalent cable type by referring to the characteristics
c
res stance may be measured with an ohmmeter by short
surin the loop-resistance out and back. Compare your reading
Distan 20 22 24 ce ft (m) 18
250 (76) 3 Ω 5 Ω 8 Ω 13Ω
315 (96) 4 Ω 6 Ω 10Ω 16Ω
397 (121) 5 Ω 8 Ω 13Ω 21Ω
500 (152) 7 Ω 10Ω 17Ω 26Ω
630 (192) 8 Ω 13Ω 21Ω 33Ω
794 (242) 10 Ω 16Ω 26Ω 41Ω
1000 (305) 13 Ω 20Ω 33Ω 52Ω
1260 (384) 16 Ω 25Ω 42Ω 66Ω
1587 (484) 21 Ω 32Ω 52Ω 83Ω
2000 (610) 26 Ω 40Ω 66Ω 104Ω
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.
Recommended Unshielded Twisted-Pair Cable Type
Cable Type Wire Size
(AWG)
Insulation Material Conductor Type Resistance (ohms) Number of
Twisted Pairs
Belden1721X 24, Solid Polyethylene Bare Copper 100 1
20 • Reference XX152-02-00 Rev 1204 SurveyorVFT Fixed Camera Dome