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Application scheme of examination room clock system (standardized examination room clock synchronization construction)

2020-11-10 17:23:32 ahjzdz

Examination room clock system ( Clock synchronization construction of standardized examination room ) Application plan

Examination room clock system ( Clock synchronization construction of standardized examination room ) Application plan

Beijing Zhun electronic technology official micro ——ahjzsz

【 Abstract 】 The clock system is a large standard timing system , With the popularity of the Internet , Many campuses have built their own campus private networks , More and more network devices and servers are used , These devices all have their own clocks , And it's adjustable . But there is no guarantee that the clocks of all devices and hosts in the network are synchronized , Because these clocks produce seconds a day 、 Even a few minutes of error . After long-term operation , The time gap will get bigger and bigger , This kind of deviation has little effect on a single machine , But in the network environment, the application may cause unexpected problems .

1、 summary

With the popularity of the Internet , Many campuses have built their own campus private networks , More and more network devices and servers are used , These devices all have their own clocks , And it's adjustable . But there is no guarantee that the clocks of all devices and hosts in the network are synchronized , Because these clocks produce seconds a day 、 Even a few minutes of error . After long-term operation , The time gap will get bigger and bigger , This kind of deviation has little effect on a single machine , But in the network environment, the application may cause unexpected problems . For example, in the distributed computing environment , Because each host clock is inconsistent , It will cause the record time of the same operation in different hosts is inconsistent , Will cause the service not to work normally . With the continuous development of various network applications , The demand for clocks is getting higher and higher , Otherwise, it will cause a lot of problems .

The campus is made up of classrooms 、 The office 、 The library and other places are composed of , The clock information of each place is inconsistent , Teachers and students can not work together to achieve the highest efficiency , It may have little influence in daily work , But in the key exam because of the clock inconsistency , The result is that students can't test out the real level , The results of classroom teaching cannot be evaluated , This has a big impact .

2、 System equipment composition

Network clock system by satellite signal receiving antenna 、NTP Satellite clock server (NTP Network master clock )、 network switch 、NTP Network clock 、 Transmission channel ( Ethernet cable )、 Management software, etc . The system structure is shown in the figure 1 Shown .

 

Standard clock

2.1 Satellite signal receiving antenna

The satellite signal receiving antenna consists of a mushroom head and an antenna of appropriate length , It can be sent to the satellite clock server ( Network master clock ) Provide satellite real-time synchronization signal .

2.2 Satellite clock server ( Network master clock )

The satellite network master clock in the clock system is a dual backup device , One of them is the main source of system time signal , The other serves as a device backup for the entire clock system , In case of emergency . Satellite Master Clock LCD The year can be shown on the screen 、 month 、 Japan 、 when 、 branch 、 Second time information and current GPS The number of Beidou satellites . The clock system consists of 2 Taiwan high stability satellite network master clock 、 Satellite receiving antenna 、 Antenna bracket 、 Client software, etc ;

Satellite network master clock multi-channel network port to classroom and office digital NTP Network clock , It can also broadcast to the campus system at the same time 、 Security system 、 Smart classroom system 、 Smart Library System 、 Fire alarm system 、 Campus card system 、 Campus information management system and other subsystems of the server monitoring host provides standard time signal .

2.3 NTP Network clock

Network clock ( That is, the time synchronization display ) Installed in a classroom or office 、 The library 、 The walkway 、 Security monitoring room and other important places that need to display the time .

The network slave clock is digital . Time division can be displayed 、 Minutes and seconds 、 Month, month, day, week, hour, minute, second , It can be ordered according to the actual needs of the site , The network slave clock automatically sends time synchronization signal request , Satellite clock server ( Network master clock ) After receiving the slave clock request, it will automatically respond and realize time synchronization .

The network clock uses frosted PC panel , Anti glare , Not dazzling ; Ultra thin metal shell design , Electrostatic spray ; Chinese characters are self luminous and integrated with numbers .

2.4 Transmission channel

Satellite network master clock and NTP There are five types of transmission channels between network slave clocks 、 Six types of network cable for management, communication line , All the equipments are standard RJ45 so .

2.5 Management software

Management software can be installed on a high-performance computer , Through the network transmission channel , Real time monitoring the running state of the clock system .

The management software can check the operation status of any network slave clock in the clock system , Any network slave clock in the clock system can be operated as necessary ( proofreading 、 stop it 、 Reset 、 Catch up with the time 、 Set the time ). When the system fails , It can accurately record the fault time and fault location , It is convenient to view and maintain, provide accurate data, etc .

3、 system function

The basic functions of the clock system are as follows :

3.1 Synchronous proofreading

The system receives continuously through the satellite signal receiving antenna GPS/ Time code and related codes sent by Beidou satellite , And analyze the received data , Whether these data are reliable . If the data is reliable, it is adopted by the satellite network master clock , If the data is unreliable, give up , Next time, continue to receive .

The network slave clock is an independent display unit , It can operate independently from the satellite network master clock , At the same time, it can actively request the standard time information of satellite network master clock , Network master clock for real-time proofreading . In order to ensure that the information received is true 、 reliable , Network master clock strictly analyzes the received request information 、 Judge , Eliminate interference information .

3.2 Time display and adjustment

Digital network slave clock time adopts “ time ; Minutes and seconds ; Month, month, day, week ” Optional mode , When adjusting the time , The network slave clock sends out a calibration request , After receiving the request, the master clock of satellite network will send the accurate time information to adjust the time of slave clock .

3.3 Provide time signals to other systems

Satellite network master clock has four channels NTP Network interface (RJ45), And each road network entrance has its own MAC Addresses are physically isolated from each other and do not affect each other's work , Be ready to provide time synchronization signal for campus network and other subsystems . The main systems include : broadcasting system 、 Security system 、 Smart classroom system 、 Smart Library System 、 Fire alarm system 、 Campus card system 、 Campus information management system 、 Campus computer room server, etc .

3.4 System monitoring function

In the control center, the clock system is set to manage and monitor the computer system , It has self diagnosis function , Fault management can be carried out 、 Performance management 、 Configuration Management 、 Safety management, etc .

The management computer in the center can detect the operation status information of the slave clock equipment , And display the detected fault status , In real time 、 Reflect the status of each module in the system in detail , And can control the whole system clock point to point ( Reset 、 stop it 、 proofreading 、 Catch up with the time ).

When the system fails, it can send out sound and light alarm , Indicate the fault location , Synchronous transmission of fault alarm , For the staff in the duty room , And record and print the fault .

3.5 System scalability

When the system is expanded , The network master clock of the center can expand the demand in real time through the expansion equipment , It is convenient for each station to add network clock .

3.6 Distributed control

The system adopts distributed control function , Distributed system , Central network master clock 、 The network slave clocks are connected with each other through five types and six types of shielded network cables , Relatively independent in the whole system , Failure of any part will not affect the operation of the whole system .

4、 System configuration principle

The campus is made up of classrooms 、 The office 、 The library 、 Weak current security control room and other places .

The installation mode and size of the clock can be determined according to the installation position , We recommend satellite network master clock 、 The size and display content of each slave clock 、 Refer to the recommended configuration table for installation location :

Computer room / Main control room HR-901GB Type master clock : use UM220-III-L( Hexin Starcom )GPS+ Beidou 2-in-1 satellite timing module is used as time source , Output 4 road NTP The time of each slave clock and computer network is synchronized , The accuracy of local area network time service 1-10ms,LCD LCD display real-time display of the number and number of Beidou satellites GPS The number of satellites and the current time information , Output 4 Physical interface of serial port , The built-in time keeping module can still provide accurate timing service when the satellite is lost ( The accuracy of punctuality is up to 0.3s/d),1U Standard rack design , Client software ,30 Meter antenna and bracket 、 Antenna arrester 、 Screw and other accessories ;

classroom HR-XS100 Digital network slave clock : Show content on one side : Minutes and seconds ( Red 5 Inch digital tube ); Dimensions 77*18*5CM; Interface :NTP The network port and the network master clock can be synchronized automatically ; Power supply 220; Travel time accuracy :0.01S/ God ; Environmental requirements :-20℃~+65℃;MTBF:≥9 Thousands of hours ;1. High brightness digital tube , long life ;2. Grind arenaceous PC panel , Anti glare , Not dazzling ;3. Ultra thin metal shell design , Electrostatic spray ;

The office HR-XS200 Digital network clock with calendar type : Show content on one side : Month, month, day, week ( Red 2.3 Inch digital tube ) Minutes and seconds ( Red 5 Inch digital tube ); Dimensions 77*29*5CM; Interface :NTP The network port and the network master clock can be synchronized automatically ; Power supply 220; Travel time accuracy :0.01S/ God ; Environmental requirements :-20℃~+65℃;MTBF:≥9 Thousands of hours ;1. High brightness digital tube , long life ;2. Grind arenaceous PC panel , Anti glare , Not dazzling ;3. Ultra thin metal shell design , Electrostatic spray ;

 

The library HR-XS200 Digital network clock with calendar type : Show content on one side : Month, month, day, week ( Red 2.3 Inch digital tube ) Minutes and seconds ( Red 5 Inch digital tube ); Dimensions 77*29*5CM; Interface :NTP The network port and the network master clock can be synchronized automatically ; Power supply 220; Travel time accuracy :0.01S/ God ; Environmental requirements :-20℃~+65℃;MTBF:≥9 Thousands of hours ;1. High brightness digital tube , long life ;2. Grind arenaceous PC panel , Anti glare , Not dazzling ;3. Ultra thin metal shell design , Electrostatic spray ;

Computer room, control room HR-XS200 Digital network clock with calendar type : Show content on one side : Month, month, day, week ( Red 2.3 Inch digital tube ) Minutes and seconds ( Red 5 Inch digital tube ); Dimensions 77*29*5CM; Interface :NTP The network port and the network master clock can be synchronized automatically ; Power supply 220; Travel time accuracy :0.01S/ God ; Environmental requirements :-20℃~+65℃;MTBF:≥9 Thousands of hours ;1. High brightness digital tube , long life ;2. Grind arenaceous PC panel , Anti glare , Not dazzling ;3. Ultra thin metal shell design , Electrostatic spray ;

Other offices HR-XS200 Digital network clock with calendar type : Show content on one side : Month, month, day, week ( Red 2.3 Inch digital tube ) Minutes and seconds ( Red 5 Inch digital tube ); Dimensions 77*29*5CM; Interface :NTP The network port and the network master clock can be synchronized automatically ; Power supply 220; Travel time accuracy :0.01S/ God ; Environmental requirements :-20℃~+65℃;MTBF:≥9 Thousands of hours ;1. High brightness digital tube , long life ;2. Grind arenaceous PC panel , Anti glare , Not dazzling ;3. Ultra thin metal shell design , Electrostatic spray ;

5、 System summary

The clock system is not only convenient for enterprises and institutions to accurately time , It can greatly improve their work efficiency , The improvement of efficiency means the improvement of social public service , And enterprises and institutions have a strong focus on time , It's their sense of service and efficiency .

With the establishment of big data in various units , The number of network devices and servers is increasing . When the network administrator is looking at the logs of many network devices , Often found that the time is not the same , Even if you set the time manually , There will also be time errors due to time zone or daylight saving time ; Some layer 2 switches restart , The clock will return to its original value , You need to reset the time . For core network devices and important application servers , Sometimes they need to work together , So the uniform accuracy of time 、 Reliability is particularly important .

At the same time, the clock system has the industry-leading environmental performance , Leading the trend of urban green office . With the accelerating pace of modern life , The popularity of networking , The demand for time accuracy is also increasing , Especially the current airport 、 The railway ( Subway and train stations )、 The hospital 、 School 、 The government authority 、 Enterprises and institutions just meet their needs , Solve real problems for them .

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