Computer to Computer: Transmission Media

With such complex communications channels, we need to be aware of the capabilities and limitations of the various media in use.

Transmission media just means the physical materials that are used to transmit data between computers.

Cable

For communications between computers that are linked by cable, there are three choices.

Twisted wire	(phone line) Advantage: Easy to string Cheap Disadvantage: Subject to interference = static and garble
Coaxial cable	(round insulated wire) Advantage: Not susceptible to interference Transmits faster Disadvantage: Heavy & bulky Needs booster over distance
Fiber optic line	(glass fibers) Advantage: Smaller, Lighter, Faster, No interference isadvantage: Expensive Harder to install and modify

Date: 2015-01-11; view: 990