What are the commonly used wired transmission media in computer networks?

Wired transmission media commonly used in computer networks include twisted pair, coaxial cable, optical fiber and hub.

1, twisted pair: Also known as twisted pair cable, it is a kind of cable used to transmit data signals. Twisted pair, including unshielded twisted pair (UTP) and shielded twisted pair (STP), is widely used in Ethernet and telephone communication.

2. Coaxial cable: refers to the inner conductor (usually copper braided wire) and the outer conductor (metal film). Coaxial cable is rarely used in LAN now, but it is still widely used in TV signal transmission and high-speed internet access.

3. Optical fiber: Optical fiber is a medium for transmitting optical signals, which has the characteristics of large bandwidth and low loss. Now it is widely used in high-speed transmission of backbone networks and data centers, as well as long-distance telephone communication and cable TV transmission.

4. Hub connection: Hubs usually use "straight-through cables" to connect computers and other network devices. The direct line is an ordinary network cable, but it is not a switch or router used to connect the "center" of the network, but a hub.