I. System overview

In recent years, with the progress of science and technology and the development of economy, the living standard of the whole society has been improved. People's life is no longer limited to the traditional basic necessities of life, and people are paying more and more attention to the surrounding living environment and environmental safety. As an important tool to protect people's lives and property, security technology has been paid more and more attention by consumers. It has been widely used in banks, museums, government agencies, shops (supermarkets) and residential quarters. As the most basic and important subsystem of security system, CCTV monitoring system has been widely used. It is the most effective measure to prevent and stop crime to adopt the system of closed-circuit monitoring combined with various technologies.

At present, most of the closed-circuit monitoring systems widely used in various industries in China are analog, and their main features are: the system adopts matrix host control, monitors the front-end targets through the TV wall, and uses long-delay analog video recorders for video recording and playback; Its main disadvantages: when video data needs to be backed up for a long time, it needs a lot of video tapes, which consumes a lot of manpower and material resources and is inconvenient to operate in video playback and retrieval. Therefore, after several years of development, the hard disk video recording system based on digital storage technology has been fully mature, which has solved the technical problems of traditional image storage and playback.

Digital hard disk video recording system not only has low storage cost and high efficiency, but also has the advantages of network transmission, remote transmission and cyclic storage. At the same time, advanced technologies such as digitization and transmission networking of hard disk video recording system can realize networking linkage with anti-theft alarm system, timely and accurately feed back on-site information, and provide sufficient and reliable basis for alarm events.

Second, the system design objectives

In the design of closed-circuit monitoring system, according to your company's basic requirements for the system, based on the principles of reasonable structure, safety and reliability, mainstream products, low cost and low maintenance, we provide your company with advanced, safe, reliable and efficient system solutions.

Reasonable architecture: it is to use advanced and reasonable technology to build the system, so that the whole system can run safely and stably and have good expansion conditions in the future.

Stability and security: This is your company's greatest concern. Only a stable system can ensure the smooth operation of your closed-circuit monitoring system. The advanced technology of the system is the guarantee and foundation of the high performance of the system, which can effectively reduce the troubles of users and system maintenance personnel. Good scalability is for the development of users. With the increase of the application time of your company's security system, the requirements for security system will be higher in the future. Scalability ensures that when users have more needs, the introduced new equipment can work smoothly with the equipment equipped this time, further expanding and improving the performance of the system.

Mainstream products: Whether the system adopts mainstream products today is related to the overall quality of the system and whether it can get good technical support and complete technical documents in the future.

When selecting equipment, we will mainly base on the specific requirements put forward by your company, and at the same time consider the technological advancement of product manufacturers, whether products are mainstream products, the integrity of technical data of original manufacturers, the technical support strength of original manufacturers and the development prospects of product manufacturing companies. These are the conditions to ensure users to get good technical support, and also the basic conditions to ensure users' investment.

Low cost and low maintenance: strive to have a good cost performance, and the products used should be simple, easy to operate, easy to maintain and high in reliability.

Whether a system has a good cost performance is an important basis for judging the quality of a system. The operability and maintainability of the system are the conditions to ensure that non-professionals can use a system well. High reliability is the basic requirement to ensure the operation of the system, and it is also the guarantee of maintainability.

Our company will design your closed-circuit monitoring system according to the above design principles. The installation, testing and acceptance of the whole project of your monitoring system will be carried out in strict accordance with international practice, combined with our technical strength and engineering experience. After the project is completed, the installation and use manuals of various equipment related to the project, various charts and other documents will be submitted at the same time, and suggestions for technical training and paid services will be put forward according to the actual needs of users.

Three. Principles and foundations of system design

3. 1 design principle

According to the overall structure of the building and taking full account of the actual situation on site, the front-end design adopts all-weather high-definition color camera, the video transmission adopts anti-interference high-shielding coaxial cable, and the control signal transmission adopts special control cable with shielding to ensure the accurate transmission of video signals and control signals; The central control system is controlled by the video matrix host, and the monitoring system information is displayed by the TV wall in real time. The video recording system adopts digital hard disk video recording system, which can realize cyclic video recording and facilitate retrieval and playback.

First, advanced:

When the investment cost allows, the system adopts advanced technology and equipment, which can reflect the advanced level of the system on the one hand, and make the system have strong development potential on the other hand, so that the system can adapt to social development as much as possible.

B, reliability:

The most important thing of the system is reliability. Once the system is paralyzed, the consequences will be unimaginable, so the system must run reliably and continuously. Under the condition of acceptable cost, the system design is strictly required from the aspects of system structure, equipment selection, technical service and product supplier's maintenance response ability, so as to make the possibility of failure as small as possible. Even if a fault occurs, the affected area should be as small as possible.

C. security:

The security performance of the security system itself can not be ignored. When designing the system, various measures must be taken to prevent illegal destruction of the system in various forms and ways.

D, scalability:

The future development needs should be fully considered when designing the system, and the system should have the possibility of expanding and upgrading the spare capacity.

E, normative:

Because this system is a strict comprehensive system, we should refer to various standards and specifications in the process of system design and construction, strictly abide by various technical regulations, and do a good job in standardized design and construction of the system.

Starting from reality, the intelligent system has high practical efficiency. This is also the key to the rapid rise and development of intelligent buildings today.

3.2 Design Basis

The design of this scheme is based on Party A's routine requirements and follows the design specifications formulated by relevant state departments as follows. Mainly includes:

① JGJ/T 16-92 code for electrical design of civil buildings

② Design Standard for Intelligent Buildings GB/T503 14-2000

③ GB50 174-93 Code for Design of Electronic Computer Rooms

④ GB50057-94 Code for Lightning Protection Design of Buildings

⑤ GBJ232-92 Code for Construction and Acceptance of Electrical Equipment Installation Engineering

⑥ GB4943-95 Safety of information technology equipment (including electronic equipment)

⑦ GB/T75-94 Safety Technical Precautions.

⑧ GB50 198-94 "Technical Specification for Civil Closed Circuit Television System Engineering"

Pet-name ruby developer's overall requirements for CCTV monitoring system

Fourth, the overall design

4. 1 demand analysis

With the development of modern science and technology, CCTV monitoring system has become an indispensable part of intelligent buildings. First of all, the closed-circuit television monitoring system creates a highly safe environment for intelligent buildings; Secondly, it can greatly reduce the management cost; Closed-circuit television monitoring system is a manager's system, which can not only greatly reduce the number of security personnel, but also create conditions for the orderly flow of personnel. In order to realize the modern management of intelligent buildings and effectively prevent or deal with emergencies, closed-circuit television monitoring system is essential.

Closed-circuit TV monitoring system is an independent and complete TV system that transmits TV signals in closed loop through cables or optical cables and displays images taken by cameras. In high-end office buildings, hotels, guesthouses and other places, there will always be a security center equipped with several to dozens of CCTV monitors. Through the closed-circuit television monitoring system, the personnel on duty in the security center can observe the security situation of the entrances and exits of the building, main passages, elevator cars and places in the center that need special protection at any time.

Closed-circuit monitoring system is divided into analog system and digital system. The difference between these two systems lies in the different forms of management and storage. For analog system, it is generally composed of matrix host, front camera, monitor, controller, decoder, pan/tilt and transmission control cable. The digital system consists of digital hard disk video host, display (or display with VGA interface), front camera, controller, decoder, pan/tilt and transmission control cable. The scheme adopts a mixed analog and digital system.

With the development of society and the gradual improvement of the legal system, people from all walks of life have higher and higher requirements for the openness and transparency of on-site office work of government functional organs, and the upper departments of government functional organs have higher and higher requirements for real-time monitoring, recording, office performance evaluation, comprehensive arbitration basis and real-time reproduction when complaints occur, so closed-circuit monitoring system has become an indispensable part of the organic whole of government functional organs; It has played an important role in strengthening the implementation of work management and supervision system, helping staff to continuously improve their professional level and correct their working methods, and maintaining the open and fair image of the government.

Closed-circuit monitoring system is also a manager's system, which can create an environment with high supervision and full real-time recording of office events for on-site office, thus greatly reducing the number and labor intensity of upper supervisors and reducing office costs; Because the closed-circuit monitoring system records the whole process of all office events in real time, when there is a dispute between the two parties, the previous work video recording can be called through the media storage device in the system to reproduce the real situation, which provides a strong basis for handling disputes; Closed-circuit monitoring system can also call the previous work video recording, which creates conditions for on-site office staff to analyze office cases and improve their business level.

Closed-circuit television monitoring system should be said to be an interdisciplinary and cross-industry system engineering, which can be divided into the following aspects according to different functional requirements:

1) Front camera system

2) Video transmission system

3) Video control system

4) Video display and recording system

The camera part is the front part of the TV monitoring system and the "eye" of the whole system. It converts the monitoring contents into image signals and transmits them to the monitor in the control center. The quality of the camera part and the image signal it produces will affect the quality of the whole system.

The transmission part is the image signal channel of the system.

The control part is the "heart" and "brain" of the whole system, and it is the command center to realize the functions of the whole system.

The display part is generally composed of several or more monitors, and its function is to display the transmitted images one by one.

1, camera section

The camera part is generally installed at the monitoring site, which generally includes camera, lens, protective cover, bracket and pan/tilt, etc. Its function is to photograph the monitoring area and convert it into an electrical signal.

camera

There are two kinds of cameras: color cameras and black-and-white cameras. Generally, black-and-white cameras are more sensitive than color cameras and are suitable for places with insufficient light. If the purpose is only to monitor the position and movement of the scene, you can use a black and white camera. If you want to distinguish the details of the subject, such as the color of clothes or scenery, the effect of choosing color will be better.

Camera specifications can be roughly divided into 1/3 ",1/4", 1/2 ",2/3" and so on. There are two installation methods: fixed installation and translation/tilt installation.

Mirror head

Commonly used lens types are: manual/automatic aperture fixed focus lens and automatic aperture zoom lens. Fixed focus lenses are divided into standard lenses and wide-angle lenses. The scope of application of fixed-focus lens is as follows:

Manual aperture lens-the ambient light to be monitored does not change much, such as indoors.

Automatic aperture lens-the illumination of the monitored environment changes greatly, such as outdoor.

Wide-angle lens-wider monitoring angle and closer distance.

Standard lens-the monitoring angle and distance are moderate.

Commonly used zoom lenses are divided into 10x, 6x and 2x zoom lenses, and another method is manual zoom and electric zoom (electric aperture and automatic aperture).

Zoom lenses can be divided into: 1/3 ",2/3", 1/2 "and 1". The principle of choosing a zoom lens is that the specifications of the lens should not be less than those of the camera, that is to say, 1/2 "lens can be used with 1/3" camera, but 1/3 "lens cannot be used with 1/2" camera.

Cover with protective layer

The protective cover is divided into indoor type and outdoor type. Indoor protective covers are mainly dust-proof, and some have hidden functions, which makes it difficult to detect and monitor monitoring occasions and objects; The functions of outdoor protective cover mainly include sun protection, rain protection, dust prevention and frost prevention. Generally, outdoor protective covers are equipped with temperature relays, which automatically turn on the fan for cooling when the temperature is high and automatically heat when the temperature is low; When it rains, you can manually control the wiper to brush the rain; The glass of some outdoor protective covers can also be heated, and when there is frost on the protective cover, it can be heated to defrost.

Handset fork spring head

Pan-tilt is the supporting equipment for installing fixed cameras, which can be divided into horizontal pan-tilt and omni-directional pan-tilt Horizontal pan/tilt is suitable for occasions with small monitoring range. After the camera is installed on the horizontal pan/tilt, the pitch angle of the camera can be adjusted, and the horizontal rotation can be remotely controlled after the optimal monitoring angle is reached.

Omni-directional pan/tilt is suitable for large-scale scanning and monitoring, which can greatly increase the monitoring range of the camera. The high-speed attitude of the pan-tilt is realized by two executive motors, which receive the signals from the controller for accurate operation and positioning. Under the control of the control signal and the personnel on duty in the monitoring center, the Yuntai camera automatically scans the monitoring area and tracks the monitored object.

Generally speaking, the horizontal rotation angle is 0 ~ 350 and the vertical rotation angle is+90. The horizontal rotation speed of constant-speed pan-tilt is generally 3 ~ 10/s and the vertical speed is about 4 /s s. The horizontal rotation speed of variable-speed pan-tilt is generally 0 ~ 32/s and the vertical rotation speed is about 0 ~16/s. In some high-speed camera systems, the horizontal rotation speed of pan-tilt is above 200°/s s. ..

decoder

Decoders are usually used in combination with matrix control hosts. Its main function is to receive the control signal of the matrix host through the data line, decode the control code of the host, amplify the output, drive the rotation of the pan/tilt, zoom and focus the zoom lens.

2. Control part

In intelligent buildings, the amount of information and the workload of information processing of closed-circuit television system are very large, so the operation of its console generally adopts computer system, and the whole keyboard mode programmed by user software is used to complete the work of driving the pan/tilt patrol, video switching, alarm processing, equipment status self-checking and so on.

At present, the digital video monitoring and alarm system adopts computer multimedia technology and takes CCD camera as alarm probe. The camera transmits the obtained video signal to the host computer, and the high-speed image processor in the host computer carries out digital processing, analyzes and compares the image formed by the video signal with the background image, and gives an alarm if there is any difference, because it is a full-screen alarm, and it is not easy to miss the report. At the same time, the upper computer automatically collects alarm images and stores them in the computer. Afterwards, users can consult the images of the alarm scene at any time according to the time and place to understand the alarm reason. The system combines the TV monitoring system and alarm system into one, and realizes the synchronization of monitoring, alarm and image recording. Moreover, this system has no video recorder and video distributor, and all alarm records are in the computer hard disk. All operations are based on the software tips on the screen, which is a new concept of security protection system for users.

The control system has two main switching modes:

Single-step switching mode: use the control keyboard to switch any input video signal to the main display.

Sequential switching mode: several input video signals in the system are compiled into a program by using the sequential switching mode program compiled by the control keyboard. When the program runs, its picture can be preset.

3. Transmission part

The transmission system includes the transmission of video signals and control signals.

Video signal can be transmitted through coaxial cable, optical fiber or twisted pair, and video conversion adapter is needed when twisted pair is used for transmission.

The transmission modes of control signals include:

Direct control: the control center directly sends control quantities to the controlled equipment, such as the power supply current of the pan/tilt and zoom lens. It is simple, intuitive and easy to realize. There are few field devices, which are suitable for manual control of the host. However, when the number of controlled ptz and lens is large, the number of control cables is large and the lines are complex, so it is not used in large-scale systems.

Multi-line coding indirect control: the control center encodes the control command into binary or other parallel codes, transmits them to the field control equipment through multi-lines, and then converts them into control quantities to control the field camera equipment. This method uses fewer wires than the previous method, and is usually used for close control.

Indirect control of communication coding: With the popularity of microprocessors and various integrated circuit chips, most large TV monitoring systems adopt communication coding, usually serial coding. Its advantage is that a single line can transmit multiple control signals, thus greatly saving the line cost. The communication distance can reach above 1km without intermediate processing, and can be transmitted above 10Km after processing. This overcomes the shortcomings of the first two methods. The system adopts this control.

In addition to the above methods, there is also a coaxial video control transmission mode, in which control signals and video signals are multiplexed by one cable. This method does not need to lay another control cable. There are two ways to realize it: one is frequency division, that is, the control signal is modulated in a frequency range different from the video signal, and then transmitted with the video signal, and then decomposed after arriving at the scene; Another method is to use the blanking period of video signal field to transmit control signals (coaxial video control). This method is obviously superior to other methods in short-distance transmission, but the equipment price is relatively expensive.

4, display and record

The display and recording equipment is installed in the control room, mainly including monitors, hard disk video recorders and some video processing equipment.

At present, there is a TV monitoring system, which encapsulates the tripod head, zoom lens and camera together to form an integrated camera. They are equipped with advanced servo system, with high rotation speed of pan/tilt, and can also preset monitoring points and patrol paths. Usually patrol automatically according to the set route. Once an alarm occurs, you can quickly aim at the alarm point for fixed-point monitoring and video recording. A camera can play the role of several cameras.

picture monitor

Image displays are mainly divided into black and white and color. The center resolution of black-and-white displays is generally above 800 lines, and color displays are generally above 400 lines. The video signal bandwidth of an image monitor is generally in the range of 7 ~ 8 MHz.

video recorder

Video recorder is a recording and playback device in CCTV monitoring system, which needs a long recording time. At present, most special video recorders for monitoring systems can record 24 hours to 960 hours of video. In addition, the video recorder must also have a remote control function to facilitate remote control operation, or automatically operate the video recorder with control signals in closed-circuit television systems.

The special video recorder in CCTV monitoring system is an intermittent video recorder with multiple recording modes at intervals. On 1/2 inch VHS/E 180 cassette, the longest video can be recorded for 960 hours. There is a character signal generator in the video recorder, which can print the recording mode of month/day/year/week/hour/minute/second on the image signal, and also display the numbers of the camera and alarm device and the alarm mode on the image. With the automatic recording cycle setting function, you can set the recording mode for each day of the week. When the alarm signal is received, the video recorder will automatically enter the continuous recording state and resume the normal intermittent recording mode without giving an alarm. In addition, the video recorder also has a lock protection key, which invalidates abnormal instructions and operations and prevents unprofessional personnel and destructive operations from infringing on the CCTV monitoring system.

Video signal changeover switch

In the CCTV system, the ratio of the number of cameras to the number of monitors is between 2: 1 and 5: 1. In order to watch multiple cameras with a small number of monitors, it is necessary to use a video switcher to distribute the video signals of cameras to specific monitors according to a certain time sequence, which is commonly called video matrix. The switching mode can switch a group of camera signals to the input of a monitor one by one according to the set time interval, or monitor the situation in the area for a long time after receiving the alarm signal at a certain point, that is, only one camera signal is displayed. The control of switching generally requires synchronization with the control of pan/tilt and lens, that is, the device that controls which way when switching to the image.

Multi-picture splitter

There are hundreds of cameras in the large closed-circuit television monitoring system, but due to the limitation of room area, the number of monitors is far less than the number of cameras, and most of them are not conducive to the comprehensive inspection of the personnel on duty. In order to realize panoramic monitoring, that is, all camera signals can be displayed on the monitoring screen, a multi-screen splitter is needed. This device can combine multiple video signals into one output and enter a monitor, so that multiple pictures can be displayed on the screen at the same time. There are usually 4 pictures, 9 pictures and 16 pictures in the segmentation method. Multi-screen splitter can be used to watch multi-channel video signals on one monitor at the same time, and can also record multi-channel video signals with video recorder at the same time. Some good multi-screen splitters also have the function of single channel playback, that is, you can choose any one of the multi-channel video signals recorded at the same time to play on the monitor in full screen.

video distributor

A video signal can be converted into multiple signals and transmitted to multiple display and control devices.

other

The cabinet is used to install CCTV monitoring system equipment, and the monitoring wall is used to install monitors.

4.2 Description of design function

Advanced performance and features:

Equipment selection should ensure leading technology, reliable performance, simple and practical operation, simple maintenance, optimal performance-price ratio and room for expansion. The equipment is manufactured by the current leading technology and production process. After the system is completed, it will not fall behind in three to five years.

The TV monitoring system has perfect functions:

Through the security monitoring system, we can know the personnel activities in the monitoring area in time, check the safety of key parts, find hidden dangers in advance, and deal with emergencies in time. And automatically record the video. Under normal circumstances, 24-hour video recording is carried out, and video data can be queried in case of accident.

High reliability of equipment:

Adopt the latest technology and high-quality equipment in monitoring industry.

Simple and practical operation:

Intelligent design is carried out by high-tech means to minimize the complexity of system operation. And make the system work stably and reliably and maintain simply.

expansibility

In the preliminary design of the system, good future development should be considered to reduce the cost of future development and make the system have good sustainable development.

economy

On the premise of meeting the requirements of safety level, on the basis of ensuring the stability, reliability and good performance of the system, and considering the advanced nature of the system, the system and equipment are selected as needed to be reasonable and practical, so as to reduce the cost, thus achieving a very high cost performance ratio and reducing the operating cost of intelligent building safety management.

Beautiful appearance:

The installation of front-end equipment considers safety, concealment and aesthetics. According to the principle of practicality and beauty, we all choose security products with good appearance and stable performance.

4.3 Overall design scheme

The closed-circuit monitoring system of XX Building consists of three parts: front-end image acquisition, image and control signal transmission and image control storage.

1, front-end image acquisition part

Xx building closed-circuit television monitoring system * * * designed 60 cameras, designed in various entrances and exits of the building (such as foyer and parking lot, etc. ), main corridors and public facilities inside the building (such as elevator car, parking lot, etc. ), mobile areas and distribution centers with high crowd density in the building (such as lobby on the first floor, elevator front room, etc.). ) Install monitoring probes to conduct on-site real-time monitoring and video recording to ensure that the building police can effectively eliminate hidden dangers or timely in case of emergency.

Four directional color high-resolution cameras are set at the entrance and exit of the building parking lot to monitor the entry and exit of personnel and vehicles; The parking lot is designed with 10 low-light color camera to monitor the underground parking lot.

There are four integrated ball machines around the building, which are linked with the surrounding alarm system. Once the intrusion alarm signal occurs, the camera will automatically rotate to the alarm area for automatic tracking and monitoring. At the same time, in the monitoring center, the system will automatically switch the alarm scene picture to the designated monitor, and the hard disk video recorder will record it in real time.

Install two comprehensive ball machines in the lobby on the first floor of the building, because this area is the crowd distribution center in the building, and monitoring and reasonable intervention will play a positive role in ensuring the order and safety of people in the building.

Each elevator car is equipped with six special color hemispherical cameras for ceiling elevators, which are used to monitor and record the real-time situation in the elevator in case of emergency.

The elevator hall on each floor of the building is designed with 34 color hemispherical cameras and long wide-angle lenses, which are used to monitor the people entering and leaving the elevator and whether the fire exits are misplaced, so as to prevent criminals from committing crimes in places with few people.

2. Image and control signal transmission part

The video signal of CCTV monitoring system in XX building adopts shielded video cable. According to the suggestion of camera installation position, coaxial cables such as RG59/ 128 (or SYV-75-5/ 128) are selected to ensure the accurate transmission of monitoring information. The control line adopts RVVP2*28/0. 15 round twisted pair shielded cable.

3. Image control storage part

The computer room of the monitoring center is located in the fire control center on the first floor of the building, and the control matrix host is designed in the monitoring room. Eight 2 1 inch monitors are used as TV walls, and 1 2 1 inch monitors are used as main monitors. The video recording system is designed with four 16 digital hard disk video recorders and four 17 inch flat panel monitors for real-time monitoring. The whole hard disk video recording system can continuously store video data 15 days, and the hard disk video recording system supports full duplex work of video recording and playback.

Verb (abbreviation for verb) System selection and configuration description

Select the corresponding monitoring equipment according to the site conditions.

Six, the system lightning protection design

The lightning protection design of closed-circuit television monitoring system in XX building includes four parts: power supply lightning protection, video signal lightning protection, control signal lightning protection and grounding.

1, power supply lightning protection

A large proportion of electronic equipment damage caused by lightning strikes is caused by equipment damage caused by inductive lightning string to power supply. According to GB50 174-93 Code for Design of Computer Rooms and GB50057-94 Code for Design of Lightning Protection of Buildings, a large number of important electronic equipment concentrated places such as central computer rooms should be designed with more than two levels of power supply lightning protection. The lightning protection design of closed-circuit monitoring system in Shangmeilin New Village establishes two levels of lightning protection for power supply: the first level protection is at the incoming end of the main power distribution cabinet in the machine room, and a set of internationally renowned brand enhanced lightning arresters is designed and used, while the second level protection is at the incoming end of UPS in the machine room, and a set of standard lightning arresters is designed and used.

2, video signal lightning protection

The system is designed to install a video arrester in front of the camera. When the video signal is over-voltage, the lightning arrester is turned on instantly to ensure the safety of the front camera and the end matrix host.

3, control signal lightning protection

The system control line is shielded by special control cable. The shielding layer of the control line is repeatedly grounded at the joints and ends. After the control line enters the control room, it first enters the signal arrester. When the control line is connected to the induced lightning overvoltage, the lightning arrester is instantly turned on, which leads the excess charge to the ground to ensure the safe operation of the front-end decoder and the end matrix control host.

4. Grounding

According to GB 50057-94 Code for Lightning Protection Design of Buildings and JGJ/T 16-92 Code for Electrical Design of Civil Buildings, the grounding electrode of all equipment in the control room and the metal shell of the equipment are grounded. The specific treatment method of grounding is: lead a branch line from the main line of the same grounding body to the central computer room, and install a bus in the computer room. Power grounding, anti-static grounding, lightning protection grounding and equipment shell grounding respectively lead the grounding wire to the bus bar and connect it firmly to ensure the safety of electrical equipment and people.

Seven, the system power supply and control room requirements

In order to ensure the normal and stable operation of the monitoring system, the system adopts online UPS centralized power supply;

The monitoring system and the central control room adopt independent power supply circuits;

The trunk is powered by AC220V, and the front end of the camera is powered by a nearby transformer.

The central control room must be equipped with communication, safety and fire fighting equipment;

The central control room must be separately equipped with air conditioning to ensure that the temperature of the control room is between 16 ~ 28℃ and the relative humidity is not more than 85%.

The control room has sufficient light, and its illumination should be not less than 300Lux；;

Other equipment in the control room and the metal shell must also be equipotentially connected to ensure the personal and equipment safety in the control room.