The DBA can complete the dynamic allocation of upstream bandwidth in microsecond or millisecond time intervals.

Question

Options

• ATRUE
• BFALSE

• A
  83% (38)
• B
  17% (8)

Explanation

Dynamic Bandwidth Allocation (DBA) is a core function of the OLT (Optical Line Terminal) in PON-based broadband networks, designed to respond rapidly to fluctuating upstream traffic demands from ONUs. DBA operates within very short polling and grant cycles - typically on the order of 125 microseconds per GPON frame, meaning allocation decisions can be made and applied in microsecond intervals, or grouped over millisecond windows depending on the DBA mode and vendor implementation. Option B is wrong simply because it contradicts this well-established characteristic of DBA; the statement in the question is factually accurate and reflects standard ITU-T G.984 and G.987 specifications.

Memory tip: Think of DBA as a traffic light controller that can switch signals in microseconds to milliseconds - not seconds - because optical networks demand near-real-time responsiveness to avoid upstream congestion.

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