Question

Select the correct statement(s) regarding 4B5B encoding.

a. 4B5B is used to map four codeword bits into a five bit data word
b. 4B5B information bit rate is 80% of the total (information plus overhead) bit rate
c. 4B5B information bit rate is 20% of the total (information plus overhead) bit rate
d. all statements are correct

Answer 1

b. 4B5B information bit rate is 80% of the total information plus overhead bit rate.

Step-by-step explanation:

4B5B bit rate encoding means there is 80% of the bit rate which included all the information plus the overheads. There is 20% of lack in bit rate due to encoding code words which converts data into smaller bits.