Physical connections use a solid medium to connect sending and receiving devices. These connections include telephone lines (twisted pair), coaxial cable, and fiber-optic cable.
- Twisted -pair cable consists of pairs of copper wire that are twisted together. Both standard telephone lines and Ethernet cable use twisted -pair. Ethernet cable are commonly used in networks and to connect a variety of components to the system unit.
- Coaxial cable, a high - frequency transmission cable , replaces the multiple wires of telephone lines with a single solid-copper core. In terms of the number of telephone connections, a coaxial cable has over 80 times the transmission capacity of twisted pair. Coaxial cable is used to deliver television signals as well as to connect computers in a network.
- Fiber-optic cable transmits data as pulses of light through tiny tubes of glass
- In terms of the number of telephone connection, fiber-optic cable has over 26,000 times the transmission capacity of twisted-pair cable Compared to coaxial cable, they are lighter and more reliable at transmitting data. They transmit information using beams of light at light speeds instead of pulses of electricity, making far faster than copper cable. Fiber-optic cable is rapidly replacing twisted-pair cable telephone lines.
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