Clock backup method and clock backup device

Abstract

The invention provides a clock backup method and a clock backup device. The method comprises the following steps: detecting the deviation between the current working frequency and the natural frequency of a master clock; and if the detection result shows that the deviation between the current working frequency and the natural frequency of the master clock exceeds the preset deviation range, switching the current working clock from the master clock to a backup clock. In the invention, by detecting the working frequency of the master clock, when the detection result shows that the deviation between the working frequency and the natural frequency of the master clock exceeds the acceptable preset deviation range, i.e. the ageing phenomenon of the master clock exceeds the usable range, the current working clock is switched from the master clock to the backup clock, thereby avoiding adverse effects on a system caused by various ageing states of the master clock by setting and controlling the deviation range of clocks, and improving the clock reliability of the system.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a clock backup method and a clock backup device. Background technique [0002] In the communication system, the position of the clock is very important, all kinds of control and data transmission are inseparable from the clock. The clock is equivalent to the "heart" of the communication equipment, without the clock, the communication equipment will stop working. The crystal oscillator used to provide the clock source is a device with a fixed oscillating frequency. The defect of this device is its high failure rate, that is, it is relatively easy to age, and as the use time increases, the crystal oscillator will age more and more. It is getting more and more serious, even in a state of complete failure and no vibration. The failure of the crystal oscillator will inevitably cause the instability of the control system, and in order to control and defend against this unstabl...

AI Technical Summary

Problems solved by technology

[0004] However, there are certain defects in this clock backup method: this method only detects that the main clock is in a state of complete failure, that is, it can only solve the problem that the main clock "does not vibrate", but for crystal oscillator devices, failure In addition to "not vibrating", the mode also includes various aging phenomena, such as too high frequency, too low frequency, etc. When the deviation between the crystal oscillator frequency and the natural frequency is too large, it is easy to cause obvious performance degradation problems in the system, such as possible Causes errors and omissions in the transmitted data, and even causes the system to fail to work directly

For example, the crystal oscillator of device A is 10.001MHz, and the crystal oscillator of device B is 9.981MHz. If device A transmits data to device B, device B will miss a lot of data due to its slow clock.

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