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Appendix
Ⅱ
Precautions & requirement of SAE-
M8000 matrix systems engineering
1. System wiring
1.Communication cable: The wiring between matrix host, control keyboard, RS485 distributor, alarm input/
out box and Hub use twisted-pair.
2.Video cable: The input/output video cable of matrix host use 75
Ω
video coaxial cable.
2.Thunder proof system
With the arrival of information age, traditional thunder proof has changed. The threatener of the thun-
der to information network is more and more outstanding. The thunder and lightning discharge will form a
very strong electric magnetic field in the twinkling of an eye when happened in the space. The energy of this
electric magnetic field will spread into the equipment through various kinds of signal lines. This will cause
the equipment damage or the data mistakes. Lightning rod of building will flow through heavy electric
current when it
’
s working. The electric current will cause two aftereffects. One is producing a strong electric
magnetic field around the Lightning rod grounding line. The other is increasing electric potential making in
a split second (1000V at most). Both the aftereffects will cause the equipment damage or the data mistakes.
Use the thunder proof measure as below in order to prevent the threat to the equipment of the thunder
and lightning.
1. Install power supply arrester at the power input port.
The thunder and lightning shock wave energy can intrude and damage power equipment from the power
supply circuitry easily, even damage the whole equipment and system. Thunder suffering analysis indicate
about (70-80)
%
thunder suffering enter from power supply circuitry. Power circuitry thunder proof is the
most important tache of the electric equipment, even the whole thunder proof system. Therefor, we advice
users who have qualification to install power arrester at the system power input port.
2.
Connecting the special-purpose signal arrester on the line between each terminal decoder and matrix
host. Arrester is needed especially using the outdoor terminal decoder. Each route needs two when installing
the arrester. One is near the matrix host while the other is near the decoder.
3.
Install the television camera arrester between each outdoor camera and matrix video cable when using
the outdoor camera. Install an arrester respectively to the matrix host and close to camera. Multimedia com-
puter and control keyboard can uninstall arrester for they are near matrix host. But it
’
s should install arrester
if they are far from matrix host.