I will share with you the application knowledge about ring switches. A ring switch is a type of switch device used for ring network switching. From its name, it can be inferred that it has the function of a ring network. An industrial ring switch is a special type of switch that is specially used in the industrial field. It has advantages such as redundancy and reliability.
As a result, ring switches are used in many areas of industrial communication. You can use a ring switch to build a ring network that connects end to end to form a closed ring. Each switch has two ports (network ports) used to form a ring network, and the switches form a ring network topology by working hand in hand with each other. One of the advantages of a ring switch is that even if a link on the ring network goes down, the transmission and communication of data on the network is not affected. Therefore, it is widely used in many industrial communication fields. The ring switch uses specific technology to effectively prevent broadcast storms and ensure the reliability of the ring network.
In order to solve the shortcomings of the shared working mode, the ring network switch is designed. A hub is a device that represents a shared work pattern. If you compare the hub with the postman, the postman is like a mere tool man who only asks him to deliver letters. He doesn't know how to send the letter directly to the recipient according to the address on the letter, he will only give the letter to everyone, and then let the recipient decide whether it belongs to him according to the address information. The ring switch is like a smart postman, with a wide back bus and an internal fabric.
All ports are connected to the industrial ring switch via a backplane bus. Once the control circuit receives the packet, the processing port retrieves an in-memory address table to confirm which port the destination MAC address and the corresponding NIC are connected to. The internal fabric is then used to quickly transmit packets to the destination port. When the destination MAC address does not exist, the industrial ring switch broadcasts to all ports and "learns" the new address after receiving the response and adds it to the internal address table.
From the above situation, it can be seen that when the industrial ring network switch receives the data packet sent by a network card, it will quickly send the data packet to the corresponding recipient according to the address information contained in the package and the "permanent resident household register" kept internally. If the recipient's address is not on the "household register", the Industrial Ring Exchange will distribute the letter to everyone in the manner of a hub, and then find the recipient from there. As soon as the recipient is identified, the industrial ring switch will immediately record his information"Hukou booklet"to deliver services faster and new messages in the future.