High-precision Ethernet timing device

Abstract

The invention discloses a high-precision Ethernet timing device which is characterized in that hardware comprises a time processing module CPU (central processing unit), the time processing module CPU is connected with a time processing field programmable gate array (FPGA) through a BUS and is connected with a GPS (global position system) receiving module through a serial port as well as connected with an IEEE1588 (Institute of Electrical and Electronic Engineers 1588) ground synchronization network module through a timing signal; the IEEE1588 ground synchronization network module comprises an IXP425 processor and an IEEE1588 FPGA port, a low-temperature drift crystal oscillator is used as a crystal oscillator source to be accessed into an FPGA phase-locked loop, and a time clock port FPGA, the IEEE1588 ground synchronization network module and the time processing module CPU are provided with timing signal output ports. The invention can be used for building an IEEE1588 ground time synchronization network and supporting clock mutual automatic switching, and can achieve timing precision of 100us in an electric system II region Ethernet under the condition of not supporting IEEE1588 by a router switch and the like.

Description

technical field [0001] The invention relates to a high-precision Ethernet time synchronization device supporting the IEEE1588 protocol. The synchronization accuracy can reach the sub-microsecond level. The device can be used to build a ground synchronization network for power systems, and is also suitable for other occasions that require high-precision remote time service. It belongs to network clock synchronization. technology field. Background technique [0002] With the increasing complexity of the power grid, having a unified time synchronization has become one of the necessary technical foundations of the modern power grid. The occurrence of power grid accidents often leads to huge economic losses and social impacts. Many large power grid accidents have shown that there are more or less time asynchronous problems in the current power grid, which brings great difficulties to accident analysis. difficulty. At present, the power grid mainly uses GPS to establish a unifie...

AI Technical Summary

Problems solved by technology

When the GPS satellite fails, the antenna is damaged, and the space electromagnetic field interferes, the unified time is completely dependent on the crystal oscillator clock inside the device. Generally, the best crystal oscillator is at 4S / month (1ppm accuracy), and most of them are at 10 -20S / month (3-5ppm accuracy), at this time, it is difficult to maintain a unified time for a long time, and deviations will quickly occur, resulting in inconsistency of the entire network time

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