Modes of Transmission
Analog transmission can be conveyed in many different fashions:
- twisted-pair or coax cable
- fiber-optic cable
- Via air
- Via water
There are two basic kinds of analog transmission, both based on how they modulate data to combine an input signal with a carrier signal. Usually, this carrier signal is a specific frequency, and data is transmitted through its variations. The two techniques are amplitude modulation (AM), which varies the amplitude of the carrier signal, and frequency modulation (FM), which modulates the frequency of the carrier.
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