GPON downstream bandwidth can reach 2.5G, and the maximum splitting ratio can usually be ().

Question

Options

• A1 to 32
• B1 to 8
• C1 to 16
• D1 to 64

• A
  10% (3)
• B
  3% (1)
• C
  6% (2)
• D
  81% (25)

Explanation

GPON is defined by the ITU-T G.984 standard, which specifies a maximum splitting ratio of 1:64 - meaning a single OLT (Optical Line Terminal) port can theoretically serve up to 64 ONUs (Optical Network Units). Option D is correct because 1:64 is the ceiling written into the standard, even though optical power budget constraints mean real deployments often use smaller ratios.

Options A (1:32), B (1:8), and C (1:16) are all legitimate GPON splitting ratios used in practice, but they represent common deployment choices, not the defined maximum - making them plausible distractors designed to confuse candidates who conflate "typical" with "maximum."

Memory tip: Think "GPON = G.984 = 64 max." The number 64 = 2⁶ follows the doubling pattern (8 → 16 → 32 → 64), and GPON's 2.5 Gbps downstream divided by 64 still yields ~39 Mbps per user - enough to remain practical, which is why 64 is the standard's upper bound.

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