What are the four widely used variations of the NRZ encoding method?

What are the four widely used variations of the NRZ  encoding method?
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1 Answer

Answer :

a. Non-return-to-zero level (NRZ-L).  
 b. Enhanced non-return-to-zero level (E-NRZ-L).   c. Non-return-to-zero mark (NRZ-M).  
 d. Non-return-to-zero space (NRZ-S).
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