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Networks: Data Encoding

8

NRZ ( Non-Return-to-Zero) Codes

NRZ-I ( Non-Return-to-Zero-Invert on ones)

The voltage is constant during the bit interval.

NRZI is a differential encoding (i.e., the signal is decoded by comparing the polarity of adjacent signal elements.)

       1 existence of a signal transition at the beginning of the bit time

                   (either a low-to-high or a high-to-low transition) 

       0 no signal transition at the beginning of the bit time

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