Video Output Connections And Options; Audio Input; Audio Output; Alarm Input And Output Connections (Some Models No Such Function, Please Prevail In Kind) - gigamedia GGM CCKIT2C Mode D'emploi

2.6.2 Video output connections and options

The video output is divided into PAL/NTSC BNC(1.0VP-P,75Ω) and VGA output(selective configuration).
When replace the monitor by the computer display, there are some issues to notice.
1. Do not stay in the turn-on state for a long time.
2. Keep the computer display normal working by demagnetizing regularly.
3. Stay away from the electro magnetic Interference.
TV is not a credible replacement as a video output. It demands reducing the use time and control the power supply and the interference
introduced by the nearby equipments strictly. The creepage of low quality TV can lead to the damage of other equipments.

2.6.3 Audio input

Audio port is RCA connection.
The input impedance is high so the tone arm must be active.
The audio signal line should be firm and away from the electro magnetic Interference and connected credible which avoid false and
joint welding and oxidation. The high voltage current should be avoided especially.

2.6.4 Audio output

Commonly the output parameter of DVR audio signal is greater than 200mv 1KΩ(BNC) which can connect the low impedance ear-
phone and active sound box or other audio output equipments through power amplifier. If the sound box and the tone arm can not
be isolated, howling phenomena is often existed. There are some methods to deal with the above phenomena.
1. Adopt better directional tone arm.
2. Adjust the sound box volume to be under the threshold that produces the howling phenomena.
3. Use fitment materials that absorb the sound to reduce reflection of the sound.
4. Adjust the layout of the sound box and the tone arm.
2.7 Alarm input and output connections
1. Alarm input
A. Alarm input is grounding alarm input.
B. Alarm input demand is the grounding voltage signal.
C. When the alarm is connected with two DVRs or connected with DVR and other equipments, it should be isolated by relay.
2. Alarm output
Alarm output can not be connected with high-power load (no more than 1A).When forming the output loop it must prevent
the big current from relay damage. Use the contact isolator when there is a high-power load
3. PTZ decoder connections
A. The grounding of the PTZ decoder and DVR must be shared otherwise the common-mode voltage will lead to
the PTZ control failure. The shielded twisted pair is recommended.
B. Avoid the entrance of high voltage. Make the layout reasonably. Take precaution from the thunder.
C. In the outlying end connect 120Ω resistance paralleled to reduce the inflection and insure the signal quality.
D. The RS485 +/- lines of DVR can not connected with other RS485 output equipments paralleled.
E. The voltage between the +/- lines of the decoder must be less than 5V.
4. Front equipment grounding note
Bad grounding can lead to the burnout of the chip.

2.8 Speed dome connections

1 Connect the 485 lines of the speed dome with the DVR 485 interface.
2 Connect the video line with the DVR video input.
3 Electrify the speed dome.
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(some models no such function, please prevail in kind)
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