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Several encoding techniques

Explain the several encoding techniques? Also describe how does the NRZ-L differ from the NRZ-I?

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Different techniques of the encoding are as follows:

a) NRZ

b) NRZI

c) Manchester

d) 4B/5B

In the NRZ-L sequence, the positive and the negative voltages have particular meanings: positive for 0 and negative for 1 whereas in the NRZ-I sequence, the voltages are generally meaningless.

Instead, receiver monitors for changes from one level to the other as its basis for recognition of 1s.

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