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2.7 Connecting Audio/Video Input and Output Devices
It is to connect audio/video device if you want to view video and hear audio.
2.7.1
Audio/Video Input Introduction
It is to introduce audio/video input port and requirements.
2.7.1.1 Audio/Video Input Port
The 4-pin aviation port is shown as in Figure 2-11.
Figure 2-11
SN
Function
SN
Function
1
VCC
，
power positive end
3
Power GND
2
Signal GND
4
Signal
2.7.1.2 Video input
The input video format includes: composite signal PAL/NTSC 1.0V
P-P
,75Ω.
The video signal should comply with your national standards.
The input video signal shall have high SNR, low distortion; low interference, natural color and
suitable lightness.
Guarantee the stability and reliability of the camera signal:
The camera shall be installed in a cool, dry place away from direct sunlight, inflammable,
explosive substances and etc.
The camera and the DVR should have the same grounding to ensure the normal operation of the
camera.
Guarantee stability and reliability of the transmission line
Please use high quality, sound shielded BNC. Please select suitable BNC model according to the
transmission distance.
If the distance is too long, you should use twisted pair cable, and you can add video compensation
devices or use optical fiber to ensure video quality.
You should keep the video signal away from the strong electromagnetic interference, especially
the high tension current.
Keep connection lugs in well contact
The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint, lap
welding and oxidation.
2.7.1.3 Audio Input
2.7.2
Audio/Video Output Introduction
It is to introduce audio/video output port and requirements.
2.7.2.1 Audio/Video Output Port
