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

A switching device and network technology, applied in electrical components, wireless communication and other directions, can solve the problem of difficult switching and achieve the effect of zero switching

CN102651895AInactive Publication Date: 2012-08-29SHANGHAI YUANDONG SCI & TECH
3 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-08-29
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

Examples

Embodiment

[0020] Such as figure 1 As shown, a real-time switching device between a VPN network and a GPRS network includes a PLC master station 1, a first GPRS antenna 3, a core switch 2, a GPRS network 5, a VPN network 4, and an RTU6. The PLC master station 1 passes through the first A GPRS antenna 3 and a GPRS network 5 are connected to the RTU6, and the PLC master station 1 is connected to the RTU6 through the core switch 2 and the VPN network 4 in turn.

[0021] Described PLC master station 1 is provided with main data area 11, VPN data temporary storage area 12, GPRS data temporary storage area 13, and described VPN data temporary storage area 12 is connected with core switch 2, and described GPRS data temporary storage area The zone 13 is connected to the first GPRS antenna 3 . Main data area 11: as an operation data area, storing uploaded data entering into operation; VPN data temporary storage area 12: storing data uploaded through VPN; GPRS data temporary storage area 13: stor...