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3 Cards in this Set
- Front
- Back
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digital data transmission
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- use voltage differences to represent the 1s and 0s in data
- on-off keying ( or Manchester encoding) converts data into digital waveform |
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on-off keying
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- digital transmission encoding scheme in which a change in voltage from one state to another within a predetermined interval is symbolized by a 1
- no voltage transmission is symbolized by a 0 - the receiver synchronizes its clock with the sender by watching for 1s - non-return to zero (NRZ) and non-return to zero inverted (NRZI) encoding - variations of on-off scheme |
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manchester encoding
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- developed as a way to overcome the limitations of on-off keying
- represents the transition from positive ground with a 0 and a negative to positive voltage transmission in the middle of the bit period designated a binary 1 - thus every bit involves a voltage transition eliminating the problem of having to transmit a long string of 1s and 0s - used over Ethernet and other high-speed digital data connections |
