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What are the transmission media commonly used in computer networks? What are its transmission characteristics?
Functions and features:
Twisted pair:
L) the most commonly used transmission media
2) It consists of 2, 4 or 8 insulated wires arranged in a regular spiral structure.
3) The transmission distance is100m.
4) Twisted pairs used in LAN are divided into two categories: shielded twisted pair (STP) and unshielded twisted pair; According to the transmission characteristics, it can be divided into three types of lines and five types of lines.
Coaxial cable:
L) consists of an inner conductor, an insulating layer, an outer shielding layer and an outer protective layer.
2) According to the bandwidth of coaxial cable, it can be divided into baseband coaxial cable and broadband coaxial cable.
3) The installation is complicated and the cost is low.
Optical fiber:
1) transmission medium has the best performance and the widest application prospect.
2) The types of optical fiber transmission can be divided into single mode and multimode.
3) Low loss, wide frequency band, high data transmission rate, low error rate and good security.
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