Xi'an SYNC

Product overview

SYN4505 The standard synchronous clock (NTP clock) is a time server based on NTP/SNTP protocol designed and developed by Xi'an synchronous Electronic Technology Co., Ltd., which is designed and developed by ourselves. It receives the GPS satellite signals and acquires the standard clock signal from the GPS geosynchronous satellite. The information is transmitted through the TCP/IP network, providing precise, standard, safe, reliable and multi-functional time service for the network equipment (users). It also produces 1PPS (second signal) synchronous pulse signal and serial port time information, and the front panel displays information such as time, month, day, time, time and time. It is a practical clock device for realizing time synchronization.

Key word GPS satellite synchronous clock, synchronous clock system, GPS timing system, time synchronization system.

Product function

1)   GPS timing signal is used to establish time reference.

2)   Provide a NTP network time service interface;

3)   Support standard NTP, SNTP and other network time protocol;

4)   Serial port time, time, minutes, seconds, years, months and days per second.

5)   Output timing synchronization signal (1PPS), TTL interface output;

6)   The front panel shows the hours and seconds of the year, the number of satellites and the working state.

Product characteristics

A)   High cost performance and wide application.

B)   The timing accuracy is high.

C)   Fully guarantee data security, can set up the same network segment or different network segments.

D)   Support a variety of popular time publishing protocols;

E)   The overall power consumption is small, using no fan design, reliable and stable operation.

Typical application

1)   Computer network, computer application system and process control management system;

2)   The time unified system and all kinds of time display screens for power plant (station) and power grid center scheduling.

3)   Electronic commerce system, B2B online system and database preservation and maintenance system;

4)   Broadcasting, finance, mobile communications, petroleum, electricity, transportation, industry and national defense.

Technical index

Guide for selection of related products

• " SYN4505 Standard synchronous clock (NTP) Mother clock) PDF color page download

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Introduction and working principle of GPS satellite clock synchronization system

The GPS satellite clock synchronization system uses the RS232 interface to receive the signals transmitted by the GPS satellite, and then converts the main CPU central processing unit to convert the local time into the interface standard (RS232/RS422/RS485) and the time coding output (IRIG_B code, ASCII code, etc.) to meet all kinds of requirements.

The GPS satellite clock synchronization system is generally composed of GPS satellite signal receiving part, CPU part, output or expansion part, power supply part and human-machine interaction module part.The GPS clock synchronization system has three timing modes: synchronous pulse output, serial time information output and IRIG-B code output.

The pulse synchronization output mode, that is, the synchronous clock outputs an accurate synchronization pulse at a certain time interval.The timing error of the clock is eliminated when the timing device is synchronized after receiving the synchronization pulse.The disadvantage of impulsive synchronization is that it can not directly provide time information. If the timing device fails, the timing device will go wrong all the time.

The way of serial synchronous output is to output the time information in serial data stream.All kinds of receiving devices receive time synchronization of the serial time information per second. During the time interval that does not receive broadcast to the time, the device clock has its own travel time error. The serial mode is more complex than the pulse timing. In addition, in the receiving process, the time spent in information processing will also affect the time accuracy, so it is mainly used to add time markup to the event. If we want to improve the time accuracy, we need to give the second time pulse signal in the field application.The rising edge of 1PPS (second pulse) signal is used to synchronize external clock and GPS clock, and the synchronization error is suppressed to meet the accuracy requirement of the system.

IRIG-B code output mode, the time code standard issued by IRIG organization for time synchronization of the systems. The most widely used version is the IRIG-B version, or B code.The B code is output in BCD code, output once per second, contains 100 pulses, and the output time information is: seconds, minutes, time and date sequence.B code generally has four forms: (TTL) level mode, RS422 level mode, RS232 level mode, and modulation signal (AM).

Pulse timing and serial port have their own advantages and disadvantages. The former has high accuracy but can not directly provide time information; the latter has relatively low accuracy, especially when multiple cell models or monitoring systems have multiple management systems and multiple subsystems.The B code takes account of the advantages of both of them. It is a high precision and standard time information. When the smart device of the substation adopts B code, it no longer needs the communication message of the fieldbus, nor does it need GPS to output a large number of pulse contact signals.According to the technical specifications, the IRIG-B DC (clock) synchronization signal should be adopted in principle for all the interlayer equipment in the substation automation system for new commissioning.