ABB XVC517AE10 3BHB004744R0010 card

Ethernet switch 
With the rapid development of computers and their interconnection technology (commonly known as "network technology"), Ethernet has become the most popular short distance layer two computer network to date. The core component of Ethernet is the Ethernet switch.
Whether it is manual switching or programmable switching, they are all for the transmission of voice signals and require exclusive circuit switching. And Ethernet is a computer network that needs to transmit data, so it uses packet switching. However, regardless of the switching method adopted, the characteristic of the switch providing an exclusive path between two points will not change. As for Ethernet devices, the essential difference between a switch and a hub is that when A sends a message to B, if it passes through the hub, all network nodes connected to the hub will receive this message (in the form of broadcasting), but the network card will filter out information that is not sent to the local machine at the hardware level; If it passes through the switch, unless A notifies the switch to broadcast, the message C sent to B will never be received (except in the case of obtaining switch control permission to listen).
Ethernet switch manufacturers have launched layer three or even layer four switches based on market demand. However, its core function is still Ethernet packet switching in the second layer, with only a certain ability to handle IP layer or even higher-level packets. A network switch is a device that expands a network and provides more connection ports in a subnet to connect more computers. With the development of the communication industry and the advancement of national economic informatization, the network switch market is showing a steady upward trend. It has the characteristics of high performance to price ratio, high flexibility, relative simplicity, and easy implementation.
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