RZ vs NRZ vs manchester-Difference between RZ,NRZ,manchester code
Digital signals are usually sequencial binary information in the form of zeros and ones. Each of this binary digits are represented by some pulse width. This pulse width vary based on the transmission data rate requirements. There are three signal types used in digital transmission of binary information. They are NRZ, RZ and manchester codes. This page describes RZ, NRZ, manchester code basics and mention difference between RZ, NRZ and manchester codes.
NRZ-Non Return to Zero
In the case of NRZ, binary digits change between H and L value and does not remain at ground or DC potential. Let us take assumption that H means High and L means Low. There are two types of NRZ waveforms viz. unipolar and bipolar.
In unipolar, H and L values are both either above zero or below zero potential. In bipolar, binary digits are both above as well as below zero potential. The bit time Tb is the time during which single digit of data is either low or high. Hence pulse width Tp is equal to Tb where in Tb is the bit period.
RZ-Return to Zero
In the case of RZ, after every binary digit, signal returns to the zero or ground potential.
Hence here pulse width is half of the binary digit bit period.
Tp = Tb/2
In the case of Manchester coding, edges are sensed and based on this meaning is provided to the digital data.
When the transmission is from L to H , then the received bit is taken as zero (i.e. '0').
When the transmission is from H to L, then the received bit is taken as one (i.e. '1').
Refer Manchester vs Diff. Manchester encoding >> for more information.
Comparison between NRZ and RZ pulse shapes used in line coding
Refer RZ versus NRZ >> which mentions comparison between RZ and NRZ pulse shapes including their advantages and disadvantages. The RZ and NRZ line coding is used for digital communication and optical Duobinary transmission system.
Line coding techniques
Difference between Unipolar Polar and Bipolar coding RZ vs NRZ vs Manchester coding RZ vs NRZ pulse shapes Advantages and disadvantages of NRZ encoding RZ encoding 2B1Q coding 8B6T coding 4D PAM5 coding MLT-3 coding 4B/5B encoding 8B/10B encoding R8ZS scrambling HDB3 scrambling
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