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Advantages of 8B/10B encoding | Disadvantages of 8B/10B Block coding

This page covers advantages and disadvantages of 8B/10B Block coding. It mentions benefits or advantages of 8B/10B encoding and drawbacks or disadvantages of 8B/10B encoding.

What is 8B/10B encoding?

Introduction:
It is block coding technique. Like 4B/5B encoding, it also uses redundancy to ensure synchronization and to improve performance of this line coding. It offers inherent error detection capability.

The "8B/10B" indicates that this block coding takes 8 bit blocks as input and produces 10 bit blocks as output. The 8B/10B block coding is a combination of 5B/6B and 3B/4B encoding as shown.

8B/10B encoding

The MSBs of 8 bit block is fed into 5B/6B encoder where as 3 LSBs is fed into 3B/4B encoder modules. The coding has 210 - s8 redundant groups.

Benefits or advantages of 8B/10B encoding

Following are the benefits or advantages of 8B/10B encoding:
➨It uses disparity controller to keep track of excess 0s over 1s (or 1s ove 0s). This helps to prevent long run of consecutive 0s or 1s.
➨The redundant groups can be used for disparity checking and error detection.
➨It is better than 4B/5B coding due to its built-in error checking capability and better synchronization.

Drawbacks or disadvantages of 8B/10B encoding

Following are the drawbacks or disadvantages of 8B/10B encoding:
➨The redundant data is the overhead for this coding technique. This increases bandwidth requirements.



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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