Vicon KRX-3, Руководство по установке и эксплуатации

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Chapter 9 – Twisted-Pair Cable Recommendations XX184-00-00 KRX-3 Video Decoder
Chapter 9 – Twisted-Pair Cable
Recommendations
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 conductor with or without tin plating to obtain a low DC resistance. Do not use
cable with either steel or an aluminum stranded conductor because these 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 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 KRX-3 and the
Camera Dome/Receiver Assembly. The characteristics of the cables in the table below should be used as a
guideline when cables other than Belden are used. Materials and construction must follow the guidelines
above.
Table 9-3: Recommended Individually Shielded, Twisted-Pair Cable Types
Cable Type Wire Size
(AWG)
Insulation
Material
Jacket
Material
Max. Distance ft. (m) 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 Datalene
1
PVC 15000 (4600) 2
Belden 9729 24 Datalene
1
PVC 15000 (4600) 2
Belden 9182 22 Datalene
1
PVC 25000 (7600) 1
¹
Datalene is a Registered Trademark of Belden.