System and implementation method of time synchronization network based on synchronous digital hierarchy (SDH)

Abstract

The embodiment of the invention provides a system and an implementation method of a time synchronization network based on a synchronous digital hierarchy (SDH). The system comprises a master clock, an SDH module and a slave clock, wherein the master clock is used for providing a standard time signal for the whole time synchronization network; the SDH module is connected to the master clock and used for receiving and sending the standard time signal which is provided by the master clock; and the slave clock is connected to the SDH module and used for receiving the standard time signal, which is transmitted by the SDH module, of the master clock, and performing synchronization and time setting. By fully utilizing the existing communication resources, the system operates in a real communication network environment and can be adapted to inversion of an SDH network without influence on indexes of the synchronization network. The synchronization accuracy of the system can be completely the same as that of a tracking satellite, and the accuracy of time synchronization is obviously improved and can be less than 1 microsecond, which is a front index of a ground time synchronization network.

Description

technical field [0001] The invention relates to the technical field of time synchronization, in particular to a system and an implementation method of a time synchronization network based on a synchronous digital system. Background technique [0002] With the continuous development of science and technology, all walks of life have higher and higher requirements for time synchronization, and research on time synchronization has been continuously carried out. The most original method is to install a GPS receiver locally. Later, people realized that every local point is time-synchronized with GPS, so safety and quality cannot be guaranteed, and a "network" system cannot be formed. [0003] For the research and application of "time synchronization network", the first thing to appear is the technology of using digital data network to transmit DCLS, that is, the unmodulated DC IRIG-B code. It is to build a set of time servers in the computer room at the provincial level. This se...

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Problems solved by technology

[0006] However, because the pulse signal is not a digital signal and cannot carry status information, it cannot effectively filter out the blockage, interruption, and misalignment caused by the transmission equipment, and cannot guarantee the quality of synchronization 100%

Especially when SDH switching occurs, the pulse signal has no time scale information, and the delay change caused by the switching cannot be calculated

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