Under the rapid development of science and technology, the types and timing methods of clock timing equipment are also developing and progressing. The time server is based on satellite timing and location signals, and the time server is simple to operate, convenient to use and accurate in timing.

The time server refers to the timing and location signals of Beidou, GPS, GLONASS and other satellites. It will acquire standard clock signals from Beidou, GPS and GLONASS satellites, and transmit them to the terminal devices by means of serial port time, IRIG-B code, NTP network protocol, 1PPS pulse and PTP network port, and ensure the time of the terminal equipment is synchronized with the satellite time. The time server also has SYN2303CDMA serial port time server. It can receive CDMA network signal and take UTC as time information. CDMA timing signal can synchronize time server, output serial port time signal and 1PPS synchronous pulse signal.

With the upgrading of time server technology, the time servers provided by different suppliers are also different, such as a company in Beijing, a company in Guangzhou, and a company in Shanghai. The SYN2151NTP time synchronization server produced by Xi'an synchronous Electronic Technology Co., Ltd., receives the GPS Beidou satellite signal as the time benchmark, and outputs 1 channels of NTP to extend the 4 channel NTP output. It supports gigabit network to 10M/100M/1000M, NTP requests > 14000 times / sec, timing accuracy 1-10ms, supports tens of thousands of clients.Output 1PPS pulse signal synchronization error is less than 30ns, output a RS232C serial port. Support for dry contact alarm, time service software, batch software, management software, support heartbeat detection functions are redundant backup. Time server built-in high precision constant temperature crystal oscillator, MTBF or more than 100000 hours, can also record the latest 20000 NTP logs, can manage Web software monitoring. SYN2151NTP time synchronization server also adds other functions, such as firewall protection and SYN-flood defense, software hardware watchdog design and QoS traffic monitoring, selection of Chinese and English, real-time checking of NTP running status, network diagnosis, etc. the server is powerful and can meet various requirements of the industry.

Some providers of time servers have fewer requirements on the function of products, such as the time server of a company, such as receiving only GPS satellite signals, output 1 NTP, NTP requests 2500 times / sec, terminal synchronization timing accuracy <50ms (typical value), support protocol NTPv1.v2.v3, SNTP.DHCP.HTTP.IPV4, output serial port and recording 100 log functions. Therefore, the equipment provided by the manufacturer is relatively simple, no firewall protection, no WiFi, real-time inspection of NTP running status, network diagnosis and other functions, and the product accuracy is low.

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