In a GPON system, dynamic bandwidth assignment (DBA) needs to be configured for ONU upstream transmission. What are the functions of DBA?

Question

Options

• ATo provide high-bandwidth services, especially services with burst bandwidth.
• BTo avoid optical signal conflicts on ODN links.
• CTo improve the upstream bandwidth utilization of a PON port.
• DTo dynamically allocate the upstream bandwidth within microseconds or milliseconds.

• A
  72% (18)
• B
  28% (7)

Explanation

Dynamic Bandwidth Assignment (DBA): DBA is a key mechanism in GPON systems that dynamically allocates upstream bandwidth among ONUs based on their traffic demands. Functions of DBA: To provide high-bandwidth services: DBA ensures that ONUs can access sufficient bandwidth for high-priority or bursty traffic, such as video streaming or large file uploads. To avoid optical signal conflicts: This is achieved through TDMA (Time Division Multiple Access), not directly by DBA. DBA focuses on bandwidth allocation rather than collision avoidance. To improve upstream bandwidth utilization: By dynamically allocating bandwidth, DBA ensures efficient use of the limited upstream capacity of a PON port. To dynamically allocate upstream bandwidth: DBA operates in real-time, adjusting bandwidth allocations within microseconds or milliseconds to meet changing traffic demands. These options accurately describe the functions of DBA. Option B is incorrect because avoiding optical signal conflicts is handled by TDMA, not DBA. Thus, the correct answers are A, C, D.

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