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Introduction
6
Cable Requirements
For operation, CyberDomes require video, power and data cables as described below:
1) The video cable carries the video signal to the remote viewing site. If sending video via
coaxial cable, a 75-ohm coaxial cable is typically used. If sending video via twisted-pair
cable, an unshielded, 22 gauge (0.64 mm) twisted-pair cable is needed.
2) The 24VAC cable powers the CyberDome and the camera. To determine cable size, refer
to the Power Cable Size and Length subsection of the Introduction.
3) The RS422 control cable carries commands from the Digiplex keypad to the CyberDome.
An unshielded, two-conductor, twisted-pair cable is required. Recommended cable size
is 22 gauge (0.64 mm).
NOTE: When using the UTP interface modules, the unshielded twisted-pair video and RS422 control
wires can share the same wire jacket, but must remain as separate twisted pairs.
Power Requirements
CAUTION!
For optimal video performance, all CyberDomes must be powered from an isolated 24 VAC power
source—fused outputs are not adequate. Allowable voltage range is 20 to 28 volts.
All domes require a 24VAC power supply that provides isolated outputs to operate the domes'
pan/tilt drive, camera, and optional heater/fan (E Option). The total power requirement varies
depending on the model of the CyberDome.
Dome power requirements (at 24 VAC):
•
All domes without a heater/fan require 16 VA
•
7-inch domes with heater/fan require 51 VA
•
Heavy-duty domes with heater/fan require 68 VA.
Power Cable Size and Length
It is important to choose the proper gauge of the cable that supplies 24 volts to the CyberDome.
An inadequate gauge will cause a voltage drop resulting in improper operation.
Table 1 gives the recommended cable lengths of varying wire gauges for a CyberDome with a
color camera. Note that the heater and fan (E Option) reduces maximum cable length sub-
stantially.
Table 1. Recommended maximum cable lengths.
Wire Gauge
2
(awg)
(mm
)
10
2.60
12
2.05
14
1.62
16
1.29
18
1.02
20
0.81
22
0.64
Maximum Cable Length
All Domes
without Heater/Fan
with Heater/Fan
(16VA)
Feet
Meters
Feet
3000
915
900
1900
580
570
1200
365
360
750
230
230
465
142
145
290
90
90
185
56
60
CyberDome Series Installation Manual
7-inch Domes
Heavy-duty Domes
with Heater/Fan
(51VA)
Meters
Feet
274
630
174
400
110
250
70
160
44
100
27
62
18
40
A06-8SG0/B/April2006/1033921C
(91VA)
Meters
192
122
76
49
30
19
12
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