Real-time switching method and device for VPNs (Virtual Private Networks) and GPRS (General Packet Radio Service) networks

Abstract

The invention relates to a real-time switching method and a device for VPNs (Virtual Private Networks) and GPRS (General Packet Radio Service) networks. The method comprises the following steps of: 1) acquiring communication state information of the VPN of all RTUs (Remote Terminal Units) in real time by a PLC (Programmable Logic Controller) master station; 2) judging whether the communication of the VPNs of all the RTUs is normal, if so, executing a step 3), and if not, executing a step 4); 3) maintaining a connecting channel of a data registering area and a main data area of the VPNs, adopting uploaded data of the VPNs as operation and display data and returning the step 1); and 4) if the communication of the VPN of certain RTU is abnormal, enabling data connection of the RTU on the main data area of the PLC master station to point at the data registering area of the GPRS immediately, and returning to the step 1). The device comprises the PLC master station, a first GPRS antenna, a core switch, the GPRS network, the VPN and the RTU. Compared with the prior art, the invention has the advantages of high efficiency, stability, reliability and the like.

Description

technical field [0001] The invention relates to a network switching method and device, in particular to a real-time switching method and device between a VPN network and a GPRS network. Background technique [0002] Network communication is the basis for the normal operation of the SCADA system. The so-called SCADA redundancy technology includes computer system redundancy, automatic control system redundancy and communication network redundancy technology. For the redundant configuration of the remote network, the wired network is generally selected as the main channel, and the wireless network is selected as the backup channel. At present, GPRS telecommunications public network and Mobitex satellite communication are widely used. Among them, the GPRS method is based on the powerful resources of the public telecommunications network; Mobitex highlights the stability of traffic and operation. However, regardless of the GPRS mode or the Mobitex mode, when the main channel enc...

AI Technical Summary

Problems solved by technology

However, regardless of the GPRS mode or the Mobitex mode, when the main channel encounters a fault interruption, the technology of switching to the backup channel has always been a technical problem: one is the real-time monitoring technology for the main and backup channels; the other is the switching of the main and backup channels and data The success rate and reliability of reconnection; the third is the instantaneous switching (zero switching) technology of switching from the main channel to the backup channel and from the backup channel to the main channel. There is currently no relevant technical report

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