In the GPON system, the upstream uses DBA technology to make full use of bandwidth resources, where the DBA template of TYPE 4 represents?

Question

Options

• AMaximum bandwidth
• BFixed bandwidth
• CGuaranteed bandwidth + maximum bandwidth
• DGuaranteed bandwidth

• A
  75% (43)
• B
  7% (4)
• C
  2% (1)
• D
  16% (9)

Explanation

In GPON's DBA framework, bandwidth templates are numbered by their allocation type: Type 1 = Fixed, Type 2 = Assured (Guaranteed), Type 3 = Assured + Maximum, and Type 4 = Maximum bandwidth only - making A correct. Type 4 is a best-effort allocation with no guarantee; the ONU receives bandwidth only when it is available, up to the configured maximum.

Option B (Fixed bandwidth) describes Type 1, which provides a static, always-reserved allocation regardless of actual traffic load. Option D (Guaranteed bandwidth) describes Type 2, which assures a minimum floor of bandwidth to the ONU. Option C (Guaranteed + Maximum) describes Type 3, which combines a guaranteed floor with an upper cap.

Memory tip: Think of the types as escalating commitment - 1 is locked (Fixed), 2 adds a floor (Guaranteed), 3 adds a ceiling on top of that floor, and 4 is ceiling-only with zero floor. "4 = Maximum only" - the number 4 has no bottom, just a top.

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