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Summary of problems related to network time server (hospital clock system)

2020-11-10 11:06:21 ahjzdz

Network time server ( Hospital clock system ) Summary of relevant issues

Network time server ( Hospital clock system ) Summary of relevant issues

Beijing Zhun electronic technology official micro ——ahjzsz

1. Should we care about the configuration of the master clock system in the hospital ? 

The construction of the master clock system , What people really benefit from is the standard time information provided by the slave clock and other terminals , The master clock is used to provide time synchronization service for the slave clock and other terminals . therefore , System design , The configuration of master clock is determined by the number and distribution range of slave clocks , It is not the master clock configuration that affects the overall design of the system . 

So suggest : After the design, the number and distribution range of the slave clocks 、 After confirming the installation position of master clock , The master clock configuration is directly handed over to the manufacturers participating in the quotation scheme . 

During this time , For the master clock configuration, you only need to put forward the following substantive requirements : 

How many of them have to be able to 、 How many types of slave clocks provide time synchronization ( The load capacity of master clock ); 

Signal transmission range and communication architecture adopted (NTP Network mode ); 

Does master clock need hot redundancy backup operation ; 

Whether it is necessary to provide time synchronization service for computer LAN ; There are several physically isolated network segments, etc . 

actually , The structure of master clock products of different manufacturers is very different . 

Our Anhui Jingzhun science and Technology Co., Ltd HR Series master clock , It is a high-end modular structure product , Generally, configuration changes only need to increase or decrease the number and types of interface modules on the same device , The external structure and installation position of the equipment itself are not affected at all . That's why the system diagram of Beidou time-frequency products , The master clock always needs to draw the same device . 

And for some manufacturers of discrete structure equipment , It could be quite different . 

2. Whether the clock management system must be equipped with ? 

This may vary from product to product . 

Anhui Jingzhun science and technology company HR Series clock system , The master clock itself is a set of satellite synchronous time service equipment with complete functions , You don't need a computer to do background support during daily operation . So in general , Whether the clock management system is on and running 、 Even if there is , It has no substantial impact on the whole clock system . 

however , Clock management system configuration , Can achieve the following functions :

In larger systems , Can be centralized management and monitoring system operation status ;

You can flexibly set the countdown of the specified slave clock 、 Specific functions such as timing switch on and off ;

In a system with a pointer slave clock , The clock management system can be used to track the time 、 Wait for the order , Adjust the travel time accuracy of the pointer slave clock ;

In the hospital system , When it is specially required to combine the clock system with the ward call system , The clock management system will manage and convert the clock and call number display function ( Rarely used ). 

3. System USES RS485 Bus structure or NTP The network structure is right, who is better and who is worse ? 

RS485 Bus structure adopts special line transmission , Stable signal transmission is its greatest advantage . But because 485 Signal transmission lines need to be laid hand in hand , There must be no branches in the middle , Some places may have to bypass the playback line , So when laying the line, the workload is relatively large . 

NTP Network timing structure , Because it can share the switching equipment with the computer LAN , So relatively speaking , There will be a lot less work on line laying . however , Using the network transmission structure to clock the slave clock , After all, it is restricted by the working state of network switches , Once the network is blocked or a switch fails , It will affect the clock operation of the slave clock . Besides, , The slave clock connected to each switch , There are fixed IP Address , So when it's necessary to overhaul , Different slave clocks cannot be interchanged .

  As a general rule , For new construction projects , We suggest that RS485 The clock system of signal timing . And if it's a new renovation of the original building , It's difficult to reroute , We are also in favor of borrowing the existing LAN , Form a set of NTP Clock system of network time synchronization structure . 

RS485 The structure and NTP The network structure is timely HR-901GB The clock system , There is no essential difference in the shape and structure between the slave clock and the master clock , Only the interface configuration is different . 

4. The hospital 、 stadium 、 What's the difference between the design of clock systems in schools or factories ?

The clock system is the same , There is no essential difference . Is it necessary to design component layer structure for specific clock system , Or whether the master clock needs hot redundancy backup operation , It all depends on the number of building clusters and the size of the scope , It has little to do with the use of the complex itself .

 

however , On the type of slave clock , There are some special models for different industries . such as , There is a special countdown clock , Suitable for installation in stadiums ; Hospital operating clock , It's designed for the hospital operating room ; Radio and television industry , There are also professional triple play sub clock can be selected . But don't worry , On that special occasion , It's not necessary to choose a special slave clock , It all depends on the need .

 

5. How to choose the type of slave clock ?

There is no absolute principle in choosing a slave clock , Only habitual adaptability . Generally consider the following points :

 

The first is the interface type ,485 The slave clock of the system should use 485 Signal interface ;NTP The slave clock of network timing system should use NTP Network timing interface .

 

Choose a pointer clock or a digital slave clock , We suggest using digital network slave clock ( This is intuitive and clear ).

Digital slave clock should pay attention to the adaptability of display character size , Usually in the ordinary office and other indoor areas , choice 4 Inch display character is more appropriate ; In larger space areas, it should show 5 " 、8 Digital clocks with inch or larger characters .

 

The choice of double and single display slave clock , This is simpler : One side is all wall hanging on the wall , A slave clock displayed in one direction ; Both sides are ceiling mounted or suspended , It's installed in places like corridors where people need to walk opposite each other . But one thing to remember : Due to the limitation of general clearance height , A double-sided clock hanging in the middle of an ordinary corridor , It has to be digital , It is not suitable to use the pointer type slave clock .

 

The choice of single digital clock and multiple digital clock : A single digital clock usually shows only " when 、 branch 、 second " Information , It has a wide range of adaptability , It can be used in all situations ; Multiple digital clock display more information , This kind of slave clock can be selected for special occasions ( Like the operation clock 、 Turn on the clock ), Or in the foyer 、 Meeting rooms and other places where the comprehensive flow of people is relatively concentrated should be selected ( Such as double calendar clock and so on ).

 

6. In some master clock configurations " Satellite signal receiving device 、 Multiplex signal expansion device 、 Central master clock 、NTP Network server 、HUB" What's going on with the device configuration ?

 

This is a master clock configuration for discrete devices , It's not the product of our Beidou time frequency company . The product of this configuration structure , It is equivalent to the various functional modules in the master clock of our system , Split it back into separate devices . To accommodate such a master clock configuration , You may have to have a separate server cabinet .

 

7. What is a master clock " Full functional redundancy backup "?

 

" Full functional redundancy backup " The concept of , be based on HR-901GB High end modular structure of master clock . It refers to that when the master clock system adopts the hot redundancy backup operation mode of master clock , The configured 2 The functional structure of master clock equipment is the same , It's just set to one main and one standby by software . Once any link of master clock breaks down , One of them can be completely removed and returned to the factory for maintenance , It will not affect any function of the system .

 

8. Whether there is another explanation for the concept of level 1 master clock and level 2 master clock ?

 

This conceptual divergence may exist . We have also seen in the master clock configuration description of some discrete devices , The so-called primary master clock is just a set of satellite signal receiving device , The secondary master clock is the core timing equipment . We think , This concept is totally wrong !

 

9. What's the difference of the address definition of the slave clock among different manufacturers ?

The model definition of slave clock is basically different from each other ; The nature of the name of the bell is basically the same , Like the pointer 、 Digital 、 Single copy 、 Double and so on .

 

however , For some specific types of slave clocks , Different names are different from each other : Like the hospital operating clock 、 Radio and television broadcast clock, etc , Some manufacturers call it the countdown clock . We think , This kind of nonstandard general term , It may confuse the real needs of the owners .

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