A case of monitoring system for an agency’s intelligent residential district in Xi’an
chrispeng [ad_1]
An office residential district in Xi’an is an important place. For safety reasons, a closed-circuit monitoring system is planned to cover the surrounding walls. In order to realize the monitoring of the surrounding activities 24 hours a day, to ensure safety.
Closed circuitmonitorThe system is required to cover the periphery of the fence, and 7 monitoring points are planned to be set up. The distance of each monitoring point is about 50-150 meters, and the maximum range of each monitoring point needs to be monitored is about 130 meters in diameter.
This project sets up a monitoring center, the specific requirements are as follows:
1. Install at each monitoring site at the front end: 7 integrated zoom black and white cameras, 7 outdoor dome pan/tilt, and 1 outdoor decoder. Among them, points 2 and 7 use black-and-white night vision cameras and corresponding pan-tilts, and are used with infrared lights. A total of 7 front-end monitoring sites. For monitoring points beyond the designed distance, an amplifier must be installed to ensure the monitoring quality.
2. Install in the back-end monitoring center: 1 set of color eight-screen split processor, 1 set of multifunctional seven-channel digital video real-time video recorder, 1 set of 19-inch color flat-screen display, 1 converter, TV wall cabinet, etc.
3. The output video signal of the camera is connected to the screen splitter through a coaxial cable. At the back end, each screen splitter provides monitoring and recording signals to the monitor and digital video recorder at the same time.
4. The RS485 bus control mode is adopted. The front-end decoder and the back-end equipment are connected in parallel through a two-core shielded cable and a three-core power cord (AC220V). The decoder provides control signals to the pan/tilt and zoom lens, and provides power to the camera. . The front-end decoder is connected to the converter (RS485) after encoding.
5. The screen splitter needs to have an RS232 interface, which is connected to the digital video recorder through the RS232 control interface, so that each screen splitter can be controlled through the control interface of the digital video recorder.
6. The front-end decoder (control of pan-tilt and lens, etc.) can be controlled through the control interface of the digital video recorder, and the image output mode of the back-end screen splitter can also be controlled through the control interface of the digital video recorder. The digital video recorder has the functions of network transmission, reception and control.
7. The digital video recorder must adopt the Chinese operation interface and provide related software to record 7 pictures in real time, and at least continuously save 7 pictures of real time video*24 hours*7 days of video data. Provide built-in network transmission function.
8. The video cable, control cable and power cable must be equipped with lightning protection devices.
9. The brand of black and white camera is Samsung of South Korea, horizontal resolution ge480 line, minimum illumination le0.02LUX, automatic iris.
10. The brand of color eight-screen segmentation processor is ROBOT of the United States.
11. The 19-inch Prime-inch flat-screen color monitor brand adopts MAG.
12. For ultra-long-distance video cables, the specifications of 75-7 should be selected.
13. The cables need to be laid according to the standard. When laying cables need to break the road or turf, they need to be restored as they are after laying.
Technical Scheme Design of Closed Circuit Monitoring System
2.1 Design ideas
When designing the closed-circuit surveillance (CCTV) system engineering, our company followed the basic requirements of a residential community in Xi’an for the closed-circuit surveillance system, based on a reasonable structure, safety and reliability, mainstream products, low cost, and low maintenance as the starting point. Based on this, we provide customers with advanced, safe, reliable and efficient solutions.
Reasonable structure: It is to adopt advanced technology to rationally structure the system to make the whole system run safely and stably, and have good expansion conditions in the future.
Stability: This is the most concerned issue of a residential community in Xi’an. Only a stable operating system can ensure the smooth operation of the closed-circuit monitoring (CCTV) system. The technological advancement of the system is the guarantee and basis for the high performance of the system, and it can be effective at the same time. To reduce the trouble of users and system maintenance personnel.
Security: The system must be a safe system to ensure reliable operation of the system.
Scalability: to ensure that when users have more requirements, the new equipment introduced can work smoothly with the equipment equipped this time to further expand and improve the performance of the system.
Product mainstream: Whether the system adopts current mainstream products is related to the overall quality of the system and whether it can get good technical support and complete technical documentation in the future.
When selecting equipment, we will mainly base on the specific requirements put forward by the Nigang dormitory area, while considering the technological advancement of the product manufacturer, whether the product is a mainstream product, the integrity of the original manufacturer’s product technical information, and the original manufacturer’s technical support force And the development prospects of product manufacturing companies. All of these are the conditions to ensure that users receive good technical support, and are also the basic conditions to ensure user investment.
Low cost and low maintenance: It means striving to have a good performance-price ratio, and the products used should be simple, easy to operate, easy to maintain, and highly reliable. Whether the system has a good performance-to-price ratio is an important basis for judging the pros and cons of a system. The easy operation and easy maintenance of the system are the conditions to ensure that non-professionals use a system well. High reliability is the basic requirement to ensure the operation of the system, and it is also the guarantee of easy maintenance.
Our company will design the closed-circuit monitoring system based on the above design principles. In strict accordance with international practices and combining the company’s technical strength and engineering experience, the installation, testing and acceptance of the closed-circuit monitoring system project will be carried out. When the project is completed, the installation and use manual of each equipment related to the project and the various systems of the system will be submitted at the same time. Charts and other documents will also put forward technical training and service commitments.
2.2 Introduction to Video Transmission Media System
2.2.1 Introduction to Transmission Media System
The choice of video transmission media should ensure that the video signal receiving end has a level of 75dB or more. The transmission distance of the 75Omega coaxial cable should not be too far, generally not more than 350 meters. When the distance exceeds 350 meters, an amplifier should be installed and taken Reliable lightning protection measures.
2.2.2 Transmission media system design principles
The transmission medium system of the integrated wiring system is based on the design specifications of the structured wiring system, and the integrated wiring system shall follow the following principles:
1) Carry out structured wiring design in accordance with the relevant standards of the structured wiring system design specification.
2) The wiring must comply with international standards to fully ensure the high-speed operation of the integrated wiring system and the reliable transmission of information.
3) The wiring not only meets the requirements of current communication technology, but also meets the needs of the future, realizing data communication, real-time voice communication and image transmission.
4) The wiring connectors should be modular standard parts to facilitate future development.
5) The wiring must have high reliability and meet the versatility and flexibility of network system design and communication system design.
2.2.3 Professional standards that the structured integrated wiring system should meet
2.3 Engineering design of closed-circuit monitoring system
According to the basic technical requirements of a closed-circuit monitoring system for a residential community in Xi’an, our company has fully analyzed the technical requirements of the project, conducted field investigations, and combined with our company’s years of experience in the research and development and construction of closed-circuit monitoring projects. For the closed-circuit monitoring system project of a residential community of an agency, the following design and construction schemes are proposed.
2.3.1 Monitoring center design
The monitoring center is equipped with an 8-channel hard disk video surveillance host, an 8-screen processor, and a monitor. Each video signal is connected to the 8-screen processor, and the video output signal of the screen processor is connected to the video distributor and divided into 2 After the channel, 1 channel is connected to the video recorder, 1 channel is connected to the monitor, and the monitors all display 8 channels of images. The digital image of the 8-channel hard disk video recording host can be replayed on other networked computers, and the replayed image can be displayed in 4, 8, 12, and 16 channels. The digitized image can be sent to the remote monitoring center through the network, and the image can be replayed on the computer in the center, and it can also be recorded.
2.3.2 Transmission medium system scheme design
According to the basic requirements of the community monitoring system construction, we give the following monitoring system wiring design plan. This scheme fully meets the technical requirements of the district wiring. With the support of high-quality wiring system, the closed-circuit monitoring system of the community will be a monitoring system with reasonable investment, high quality, high reliability, and easy maintenance.
1. Monitoring point 1 is located near the monitoring center, and the video signal is transmitted by -9 75Omega coaxial cable.
2. The distance from the monitoring center to monitoring points 2, 3, 4, 5, 6, 7 (the precise location is to be determined, temporarily press the original location), the distance is about 80~200 meters, respectively, and the video signal adopts -9 type 75Omega coaxial cable For transmission, a video amplifier can be installed to amplify the signal if necessary.
3. The RS485 communication signal of the pan/tilt decoder is transmitted by a 4times1.5mm2 shielded cable, and effective lightning protection measures are taken. The RS485 communication cable adopts a bus structure.
2.3.4 Selection of core equipment of closed-circuit monitoring system
According to the requirements of the closed-circuit monitoring system of the community, the monitoring center is equipped with an 8-channel hard disk video monitoring host, an 8-screen processor, and a 19Prime color flat-screen display for monitoring.
We choose NVRec-400FA 8-channel video digital hard disk recorder as the core equipment of this monitoring system. The digital video recorder digitizes the video signal and records it on the hard disk. At the same time, the built-in network transmission function broadcasts the digital video information on the network. Send, and replay it on the PC of the receiving end through the playback software to realize remote closed-circuit monitoring. It is very suitable for the occasions of establishing remote closed-circuit monitoring system by remote connection methods such as ISDN, DDN, E1, local area network, and VPN private network. At the same time, because of it The transmission rate is adjustable, and PSTN transmission can also be used.
[ad_2]
