18
The video input interface is BNC. The input video format includes: PAL/NTSC
BNC
（
1.0V
B
P- P
，
B
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
BTTTB
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
BTTTB
The signal line and shielded wire should be fixed firmly and in well connection. Avoid dry joint,
lap welding and oxidation.
BTTTB
3.5.2 Connecting Video Output
Video output includes a
T
BNC(PAL/NTSC
BNC
（
1.0VP- P
，
75Ω
）
output and a VGA output.
System supports BNC and VGA output at the same time. See
X284H284H284H
Figure 3-2
X.
When you are using pc-type monitor to replace the monitor, please pay attention to the following
points:
To defer aging, do not allow the pc monitor to run for a long time.
Regular demagnetization will keep device maintain proper status.
Keep it away from strong electromagnetic interference devices.
Using TV as video output device is not a reliable substitution method. You also need to reduce
the working hour and control the interference from power supply and other devices. The low
quality TV may result in device damage.
3.6 Connecting Audio Input & Output, Bidirectional Audio
3.6.1 Audio Input
These series products adopt BNC port.
Due to high impedance of audio input, please use active sound pick-up. See Figure 3-8.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose
contact and it shall be away from high tension current.
The 4-pin aviation-level port is shown as below. It is to input the audio and video.
