Data transmission - P1f

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  • Created by: iram_f
  • Created on: 24-09-14 21:32
What is multiplexing?
Multiplexing is when more than one digital signal is sent in an optical fibre at the same time, without being mixed together (they are interleaved/kept separate).
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What are digital signals?
Digital signals transmit data as a series of pulses. They only have two states: on (1) or off (0) & it is this pulse pattern, length of the on off sections, that make the information. This means that digital signals are not affected by interference.
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What can infrared radiation be used for?
Infrared can be used in devices such as remote controls, automatic sensors, short-distance wireless links, burglar alarms and security lights (which detect body heat).
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What are analogue signals?
Analogue signals vary continuously in amplitude - they can have any value within a fixed range of values. Interference in the form of noise creates poor analogue signal quality.
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What are some uses of multiplexing?
Using digital signals and a multiplexer you get a greater choice of programmes on TV, information services and interactive TV.
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Other cards in this set

Card 2

Front

What are digital signals?

Back

Digital signals transmit data as a series of pulses. They only have two states: on (1) or off (0) & it is this pulse pattern, length of the on off sections, that make the information. This means that digital signals are not affected by interference.

Card 3

Front

What can infrared radiation be used for?

Back

Preview of the front of card 3

Card 4

Front

What are analogue signals?

Back

Preview of the front of card 4

Card 5

Front

What are some uses of multiplexing?

Back

Preview of the front of card 5

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