Optical modules are classified based on their optical loss budget, which determines the maximum distance they can support over fiber-optic cables.
Class Comparison :
CLASS B : Supports shorter distances with lower optical loss budgets.
CLASS B+ : Provides a higher optical loss budget than CLASS B, supporting longer distances.
CLASS C+ : Offers an even higher optical loss budget, suitable for extended-reach deployments.
CLASS C++ : Provides the highest optical loss budget, enabling the longest reach and greatest flexibility in network design.
Why B?
CLASS C++ has the most sufficient optical loss budget, making it the best choice for scenarios requiring maximum reach and reliability.
Thus, the correct answer is B .
References:
HCIA Huawei ACCESS Official Documentation , Chapter: Optical Module Specifications.
ITU-T G.984.x Standards for GPON .
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