Vicon VN-755IP, Руководство по установке и эксплуатации

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19
Twisted-Pair Cable
Caution: Careful selection of proper cable is essential to obtain the best performance. Vicon assumes no responsibility for poor
performance when cables other than the recommended types, or equivalent, are used.
Materials
Use a pure copper stranded 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 they do not transfer signals effectively for long distances. The
preferred insulation and cable jacket 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 dual individually-shielded, twisted pair in a single jacket. This configuration is
the most convenient for RS-422/ RS485 applications. Single individually-shielded, twisted pair is also a suitable cable.
Choose a Belden cable type by referring to the characteristics and maximum distances listed below. The maximum
distance for the most reliable digital control refers to the distance between the CPU/Keypad and the Camera Dome
Assembly. The characteristics of the cables in Table 6 should be used as a guideline when cables other than Belden are
used. Materials and construction must follow the guidelines above.
CABLE
TYPE
WIRE SIZE
(AWG)
INSULATION
MATERIAL
JACKET
MATERIAL
DISTANCE ft (m)
max.
NUMBER OF
TWISTED PAIRS
Belden 9406 22 PVC PVC 5000 (1500)
2
Belden 9402 20 PVC PVC 5000 (1500)
2
Belden 8723 22 Polypropylene PVC 8000 (2400)
2
Belden 8162 24 Datalene¹ PVC 15000 (4600)
2
Belden 9729 24 Datalene¹ PVC 15000 (4600)
2
Belden 9182
22 Datalene¹ PVC 25000 (7600)
1
¹
Datalene is a Registered Trademark of Belden.
Belden Inc. http://www.belden.com/(800) 235-3361
Table
Recommended Individually-Shielded, Twisted-Pair Cable Types
XX156-00-01 Rev 705 VN-755IP Camera