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Networks: Data Encoding

7

NRZ ( Non-Return-to-Zero) Codes

Uses two different voltage levels (one positive and one negative) as the signal elements for the two binary digits.

NRZ-L ( Non-Return-to-Zero-Level)

The voltage is constant during the bit interval.

Used for short distances between terminal and modem or terminal and computer.

1

 negative voltage

0  positive  voltage

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