Shulou(Shulou.com)06/02 Report--

The NTP clock server still has this function.

A brief introduction to Beidou School time Server

Beidou timing server is in response to the time unified system requirements of the majority of customers, from the point of view of ensuring security, using the current advanced circuit integration, software programming technology, combined with the technical characteristics of China Beidou satellite, to achieve the input of Beidou satellite signal, output (TTL, IRIG-B, differential, serial port, network, etc.), multi-device application (network camera, NVR, server, storage, computer, controller, etc.) It provides a standard clock source with high precision, high stability, high security and high reliability for rail transit, meteorological power, finance, waterway water transportation and related fields. The equipment embeds the international NTP/SNTP protocol, synchronizes all the computer servers, controllers and other devices in the network, and realizes the network time calibration, which is the best choice to provide accurate, standard, safe and reliable clock synchronization service for the network equipment.

The Beidou calibration server has the function of satellite receiving state switching, which can distinguish the state of GPS and Beidou receiving satellites. Any reference source of GPS or Beidou can be set as the reference source. When the active reference source is unstable or unavailable, it can automatically cycle to the next level of standby system. If the two systems are not available due to interference or can not receive the satellite due to external reasons, the equipment can automatically switch to the punctual unit mode and continue to provide highly reliable time and frequency reference information output.

The core technical parameters are as follows

1) support time synchronization in windows, LINUX, UNIX, SUN SOLARIS, IBM AIX and other operating systems

2) support NTP v1.v2.v3&v4 (RFC1119&1305), SNTP (RFC2030) and other protocols

3) support DHCP function, and all network devices connected to LAN port can obtain IP address automatically.

4) excellent security performance, providing firewall protection, enabling SYN-flood defense, greatly improving the security of the internal network and reducing risk

5) heartbeat detection is supported. Multiple time servers or network ports can be set to the same IP, which are redundant backups for each other.

6) Parameter management mode that supports WEB and SSH encrypted communication and software monitoring settings

7) support WEB firmware upgrade, provide parameter backup and import, system local log and remote log sending and other functions

8) provide software and hardware watchdog design, QoS function (traffic monitoring) and network diagnosis, etc.

9) Parameter settings files can be exported and imported

10) switch between Chinese and English on the network configuration page, setting username, password and hostname

11) Real-time monitoring of load, elapsed time, real-time traffic and memory status

12) display real-time links, including IP, communication protocols and interactive data volume of the time server accessed by the client, and display historical data in graph form.

Chassis Siz

1Udre 19 "Standard chassis (upper rack) 482mm (W) x 300 (D) x44mm (H)

The physical picture of the Beidou school server is as follows:

SYN2136 Beidou NTP Network time Server

Ten characteristics of Beidou school service:

1. Modular structure, the number of NTP/SNTP ports can be configured flexibly, and up to 70 physically isolated network ports can be used by users.

2. Beidou antenna is optional, mushroom head antenna and sucker antenna, mushroom head antenna can be put outdoors, 30m, 50m, 80m, 100m, 150m, 200m length for users to choose, sucker antenna is mainly placed next to the window, it is convenient to install, and there are two kinds of time service antennas: 1, GPS time service antenna, 2, GPS Beidou dual mode time service antenna If it is Beidou dual-mode equipment, the time service antenna can be set up with GPS Beidou dual-mode time service antenna, and there is no need to set up 2 antennas, which saves a lot of manpower, material and financial resources for the whole project.

3. With large capacity, the Beidou school server can provide tens of thousands of terminals with accurate time at the same time.

4. There are many configuration methods, including software configuration and computer configuration for users to choose from.

5, equipment special embedded system, no hard disk and fan design, stable and reliable operation.

6. The liquid crystal display of the equipment is rich in content, such as: star collection state, year, month, day, minute and second, time validity and so on. Star collection status is a guarantee for the accuracy of time information. The equipment department outputs one second pulse signal, which is convenient for the third party to test the accuracy of the equipment.

7. The chassis of the Beidou calibration server is imported aluminum plate chromic acid passivation, drawing fine wire dumb silver, after passivation treatment of aluminum plate, aluminum plate chromic acid passivation makes its surface form a dense passivation film to achieve the purpose of corrosion resistance, the existing black chassis and silver-white chassis for users to choose.

8. Using SMT surface mount technology to produce, with high-speed chip control, no hard disk and fan design, high precision, good stability, strong function, no accumulated error, not limited by regional climate and other environmental conditions, high performance-to-price ratio, simple operation, automatic intelligent operation, no operation and maintenance, suitable for unattended.

9. The quality guarantee period shall be from the date of acceptance of the equipment delivery. During the product quality guarantee period, if there is a failure caused by the product's own quality, we should take the way of repairing the whole machine, sending accessories and providing spare products to provide comprehensive and free warranty service.

10. Any single or multiple Beidou school servers can achieve redundant backup, providing customers with a stable time source.

11. The network topology diagram of Beidou school server is as follows:

As shown in the figure, Beidou time synchronization can be synchronized to computers, network cameras, various servers / storage, video surveillance terminals, and network sub-clocks at the same time through the network switch to achieve the function of time unification.

The method of use is as follows:

1. Check whether the equipment and accessories are in good condition according to the packing list. If you find that the packing box is seriously damaged, you can contact the manufacturer until the instrument passes the performance test.

2. Take the equipment out of the packing box and place it flat on the console or cabinet. Insert the antenna into the antenna input of the equipment and ensure that the antenna can receive the star.

3. Connect the antenna and turn it on. The star can be received within 3-5 minutes. The letter in the display screen changes from V to A, and the number of stars can be displayed. It is effective when receiving more than 2 stars. After receiving the stars, connect the network cable from the network port of the equipment to the switch and calibrate the time according to the instructions.

Friendly reminder:

1. Install the mushroom head of the antenna on the antenna bracket and fix it on the top of the house or platform, ensure that the mushroom head of the antenna has as large a field of view as possible (360-degree sky), there are no obstacles, if equipped with a lightning arrester, connect the lightning arrester between the machine and the antenna.

2. All antennas are standard, and links should not be truncated or superimposed at will, otherwise there is no guarantee of receiving stars.

3. All antennas first test the effect of satellite collection after receiving the goods, which saves a lot of trouble than setting up cables and then testing the effect of satellite collection.

4. When the satellite is not received, change the antenna to a few more places to try the effect, so as to eliminate the problem of the antenna or the receiving area.

Xi'an synchronous Electronic Technology Co., Ltd.

The significance of Beidou Satellite time Service

Using the Beidou satellite, the ultrashort wave propagation time signal can be used all over the world; using the ultrashort wave propagation time signal not only has high transmission accuracy, but also can improve the accuracy of clock comparison. Through the common view method, the satellite clock is used as a carrying clock, and the time service accuracy is higher than that of the direct moving clock, so it is difficult to move the clock directly. Common view can eliminate a lot of systematic errors and errors that change slowly with time, and the random errors of fast change can be smoothly eliminated by accumulation.

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