Describes the principles of Optical Fiber switches.

Most people do not know much about fiber switches. In fact, fiber switches are still widely used in daily life, optical fiber switches are widely used in some entertainment places, such as Internet cafes and game halls.

What is an Ethernet switch? Switching refers to the technology that sends the information to be transmitted manually or automatically by devices according to the needs of transmitting information at both ends of the communication. In a broad sense, a switch is a device that performs information exchange in a communication system.

Switching and optical fiber switches originated from the telephone communication system (PSTN). Now we can see this scene in old movies: the head of the phone (the main user) picked up the microphone and shook it for a while, the local terminal is a machine with a full line header inserted. In case of a headset, the customer will receive the connection request.

Insert the line header at the corresponding exit to establish a connection for the two clients until the call ends. This process is an exchange established manually. Of course, we have already popularized programmable switches, and the exchange process is automatically completed.

In computer network systems, the concept of exchange is an improvement of the shared working mode. The HUB we have previously introduced is a shared device. The HUB itself cannot identify the destination address. When host A in the same LAN transmits data to host B, data packets are transmitted in broadcast mode on the HUB-based network.

Each terminal verifies the address information of the data packet header to determine whether to receive the packet. That is to say, in this way, only a group of data frames can be transmitted over the network at the same time. If a collision occurs, retry. This method is shared network bandwidth. What is an Ethernet switch with a high bandwidth back bus and an internal switching matrix. All the ports of the vswitch are attached to the back bus. After the control circuit receives the data packet.

The processing port will look for the address table in the memory to determine the port on which the NIC (NIC) of the target MAC (NIC's hardware address) is mounted, data packets are quickly transmitted to the destination port through the internal switching matrix. If the target MAC does not exist, it is broadcasted to all ports. After receiving the port response, the switch "learns" the new address and adds it to the internal address table.

What is an Ethernet switch can also "segment" the network. Through the address table, the switch only allows necessary network traffic to pass through the switch. Through the filtering and forwarding of vswitches, the broadcast storm can be effectively isolated to reduce the occurrence of incorrect packets and wrong packets, so as to avoid sharing conflicts.

What is data transmission between multiple port pairs at the same time. Each port can be considered as an independent network segment, and the network devices connected to it enjoy all the bandwidth alone, so they do not need to compete with other devices. When node A sends data to node D.

Node B can send data to node C at the same time, and both transmission enjoy all the bandwidth of the network and all have their own virtual connections. If 10 Mbps Ethernet switch is used here. The total traffic of the vswitch is 2*10 Mbps = 20 Mbps. When a 10 Mbps shared HUB is used, the total traffic of a HUB will not exceed 10 Mbps.

In short, an optical fiber switch is a network device that can encapsulate and forward data packets based on MAC address recognition. The vswitch can "Learn" the MAC address. Store it in the internal address table. By creating a temporary exchange path between the initiator of the data frame and the Target receiver, the data frame can directly reach the destination address from the source address.

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