Safe network switching device
A technology for switching devices and safety networks, applied in data exchange networks, data exchange through path configuration, digital transmission systems, etc. Certainty, the effect of improving certainty
Active Publication Date: 2013-04-17
CHINA TECHENERGY +1
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Problems solved by technology
In security-level network communication, its software and hardware have certain requirements. The software and hardware serving IEEE1588 increases the complexity of the system and reduces the reliability of the system.
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[0028] The present invention is made up of switching main module and relevant communication circuit of communication node, such as figure 1 and figure 2 shown. Its main components are PHY, CPLD, and FIFO. PHY is the abbreviation of 10 / 100M Ethernet physical layer transceiver. It mainly completes the conversion of media signal and MII (media independent signal) signal. The function of PHY is completely in line with IEEE802.3. For specific functions, please refer to the product manual of relevant manufacturers or IEEE802. 3. CPLD is the abbreviation of complex programmable device, which realizes the function of digital logic. FIFO means first in, first out. There is data storage space inside the FIFO device, and the read and write operations are separated, so as to realize asynchronous transmission of data. The FIFO sends data to the PHY device through the MII bus, and the MII bus is the connection channel between the two. The MII bus is a data bus specified in the 802.3 s...
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The invention relates to a network switching device for point-to-point connection in safe network communication, which is formed by a switching module and communication nodes by communication circuits, wherein the switching module is composed of a plurality of physical layer transceivers and complex programmable devices, the physical layer transceivers and the complex programmable devices use MII(media independent interface) connection; each communication node is characterized by being composed of a physical layer transceiver, a first in first out memory and a complex programmable device; the physical layer transceivers of the nodes are connected with the physical layer transceivers of the switching modules; the first in first out memories are connected with the physical layer transceivers of the nodes; and the complex programmable devices of the nodes are connected with the first in first out memories and the physical layer transceivers of the nodes. The first in first out memories realize non-synchronization of data without using software, thus improving the reliability of the system to a great extent, and the device does not have complicated protocol, thus improving the certainty in communication.
Description
technical field [0001] The invention relates to a network switching device, in particular to a network switching device used for point-to-point connection in secure network communication. Background technique [0002] The focus of industrial Ethernet is to use switched Ethernet technology to provide an interactive mechanism for the mutual coordination and cooperation between controllers and operation stations, and various workstations, and to seamlessly integrate with the upper-level information network. At present, industrial Ethernet has gradually occupied the mainstream position in the monitoring layer network and is penetrating into the field device layer network. Compared with previous automation technologies, industrial Ethernet has many advantages. However, things are relative. While enjoying the achievements of open interconnection technology progress, we should have a deep understanding of their hidden dangers and possible serious consequences. Therefore, industria...
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IPC IPC(8): H04L12/24H04L12/28
Inventor 徐晓冬朱毅明高超
Owner CHINA TECHENERGY