Security monitoring system design and construction techniques

Security monitoring system design and construction techniques
A, cable selection
TV monitoring system wiring design involves video monitoring circuit, intercom, alarm

circuit, audio circuit lines, network lines.
Their different functions, selection of cable types are not the same.
1 camera video signal transmission cable
Video transmission cable used for thin coaxial cable 75 ohm series coaxial cable, but

different wire diameter on the video signal attenuation range
Degree is not the same, the cable is thicker, the smaller the attenuation. The

characteristic parameters of coaxial cable series as shown in table 1. According to

table 1 to select cable.
The cable line size is coarse, attenuation is smaller, more suitable for long distance

transmission. Choose the cable as follows:
When the camera to center monitoring distance ≤ 300 meters, can be used SYV-75-3;
When the camera to center monitoring distance ≤ 500 meters, can be used SYV-75-5;
When the camera to center monitoring distance ≤ 800 meters, can choose SYV-75-7 or

SYV-75-9;
When the camera to center monitoring distance ≤ 1000 meters, can be used SYV-75-12;
The 2 camera power line
Power line in the television monitoring system using separate wiring, switch is

arranged in the control room, through the UPS power supply, to the entire monitoring

system
Direct control, under normal circumstances, power line by AC 220V wiring, the camera

end the adapter into 12V dc. But,
Some camera is used in 5V DC or 12V, 24V, power supply mode is not the same.
3 use the camera device for cable with electric pan, electric lens
The camera device with an electric pan, electric lens, in addition to the video signal

lines, cable, but also consider the decoder
Transmission cable between control center, using 2 general core shielded communication

cable (RVVP) or category 3 twisted pair, UTP core cross section
0.3m square meters ~0.5m square meters.
The 4 alarm and audio cable
The prison, the corridor alarm, prison cable generally use 4 core shielded

communication cable (RVVP) or category 3 twisted pair UTP, each core section
Area of 0.5m square meters.
5 radio and telephone cable
The prison, corridor, factory etc. setting broadcast, cable is the basic principle: the

longer the distance, the more coarse wire. RS-485 communication.
The basic communication distance is 1200 meters, the selection of RVV-2/1.5 cable in

practical engineering, the communication distance is extended to 2000 meters,
Talk radio, visual distance to select different cable, twisted pair.
6 computer network cable
Computer network cable is divided into two categories. Between a kind of vertical

lines, building cable, another kind is the horizontal trunk 4 to 8 core
Shielding Super 5 lines. According to the actual situation of prison project, the

optical fiber and Cable Company Limited Senior 50 μ m/125 choice between building
Cable M.
Multilayer optical cable used in sub monitoring to the monitoring center, single film

optical cable used in the monitoring center to the monitoring centre. The work area to

management
Methods 4 pairs of /8 core 5 shielded twisted pair.
When installing monitoring transmission device camera must choose the better quality of

wire rod, and when installing surveillance cameras wiring should be reasonable, whole
Qi, install strong. The security people Xiaobian for installation requirements are

summarized as follows:
1, to install surveillance cameras monitor wire, working voltage and the rated voltage

should be not less than the line insulation monitoring; wire should be consistent with

the line
Installation and laying of road conditions. Cross sectional area monitoring wire should

satisfy the power supply and the mechanical strength requirements.
2, the installation of surveillance cameras wire should be avoided when monitoring wire

splice. Unless using the joints can not be, the joints must be camera
By pressing or welding, monitor wire connection and branching point should not be

affected by mechanical force. Air monitoring wires in the tube, in any case.
You can't have a joint, when necessary, as far as possible the connection on the

connection box probe wiring column.
3, the installation of surveillance cameras installed to keep the wire horizontal or

vertical in the building. Wire should be casing protection (plastic or iron pipe
Selection of indoor plumbing, according to technical requirements), the ceiling line

available metal hose, but need to fixed and beautiful.
4, the installation of surveillance cameras signal lines and power lines is not

parallel, but can not put in the same pipe. If external constraints, to
Parallel lines, at least more than half a meter.
AC power supply 5, install surveillance cameras alarm box should walk the line alone,

no camera and signal line, low voltage DC lines in the same
A management, communication wire installation should be consistent with the electrical

installation standards.
6, the installation of surveillance cameras alarm box to ceiling wiring requirements

and management into the wall or iron water pipes to be protected, in order to improve

the
Damage performance of anti-theft system.
7, the installation of surveillance cameras line pipe and wire Ming and dark with two.

Camera Ming piping requirements vertically, neat appearance.