Question: Question 19 The coding scheme in which the signal switches between Positive voltage and negative voltages to define bit 1 and bit G respectively

Question 19 The coding scheme in which the signal switches between Positive voltage and negative voltages to Question 21 A ratio between Data element and signal element in the physical layer is O a. Is used for framing

Question 19 The coding scheme in which the signal switches between Positive voltage and negative voltages to define bit 1 and bit G respectively is Oa Unipolar NRZ b. Polar NRZ Oc UniPolar NRZ-L Od. Polar NRZ I Question 21 A ratio between Data element and signal element in the physical layer is O a. Is used for framing O b. Is used in signal generation O c. Is used in bit synchronization O d. Is used in data link layer

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