Digital Network Video Surveillance System
Figure 3-8
The audio input cable is shown as in Figure 3-9. Please use this cable when your camera is the general
BNC port.
Figure 3-9
Please refer to the following sheet for detailed information.
Audio/Video input cable (Aviation port 4p male port)
Port
Color and Definition
1
Yellow BNC male port
（
Video input
）
2
White BNC male port
（
Audio input
）
3
DC power male socket external is negative and internal is positive
（
Camera power output
）
4
DC power male socket external is negative and internal is positive
（
Camera power output
）
Audio Output
The audio output signal parameter is usually over 200mv 1KΩ (BNC). It can directly connect to low
impedance earphone, active sound box or amplifier-drive audio output device.
If the sound box and the pick-up cannot be separated spatially, it is easy to arouse squeaking. In this case
you can adopt the following measures:
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