The Ethernet switch is a switch based on Ethernet to transmit data, and Ethernet is a local area network that uses a shared bus transmission medium. With the rapid development of computers and their interconnection technologies, Ethernet has become the most popular short-distance and two-layer computer network. The core component of Ethernet is Ethernet switch.
There is an important assumption in the design of Ethernet switch. That is, the speed of switching core is so fast that the usual large-flow data cannot block it. In other words, the exchange capacity is infinite relative to the amount of information transmitted.
Ethernet switches are widely used with relatively low price and complete categories. They can be found in various local area networks. An Ethernet switch usually has several to dozens of interfaces, which is essentially a multi-interface bridge. In addition, its interface rate and working mode are both different. For example, it can provide bandwidth of 100M and 1000M. It can also provide half-duplex, full-duplex, adaptive working mode, etc.
Here are some common interfaces of Ethernet switches.
1. RJ-45 interface
This kind of interface is the most common interface of network equipment. It is commonly called "Crystal Head". The technical term is RJ-45 connector, which belongs to the twisted-pair Ethernet interface type. RJ-45 plug can only be inserted in a fixed direction. There is a plastic shrapnel stuck with the RJ-45 slot to prevent it from falling off.
This kind of interface can be used in 10 Base-T Ethernet, 100 Base-TX Ethernet and 1000 Base-TX Ethernet. The transmission medium is twisted pair, but there are different requirements for the medium according to different bandwidths. Especially when connecting with 1000 Base-TX Ethernet, the fith type lines are required at least. If you want to ensure stable and high speed, you need the sixth type of lines.
2. BNC interface
Ethernet BNC interface is specially used to connect with thin coaxial cable, which is often called "thin cable". Its most common application is the separated display signal interface, which uses red, green and blue for distinction. Horizontal and vertical scanning frequencies are input into the interface of the display separately, reducing the interference between signals.