H35-210_V2.5 · Question #276
Is the following description correct? In EPON, when the fiber length under the PON port is 10KM, the recommended splitting ratio is 1:32; when the fiber length is 20KM, the recommended splitting…
The correct answer is A. True. Option A is correct because EPON systems must balance two competing factors: fiber distance and splitting ratio. Longer fiber introduces greater optical signal attenuation, meaning each ONU receives less power - so at 20KM, the splitting ratio must be reduced from 1:32 to 1:16…
Question
Is the following description correct? In EPON, when the fiber length under the PON port is 10KM, the recommended splitting ratio is 1:32; when the fiber length is 20KM, the recommended splitting ratio is 1:16.
Options
- ATrue
- BFalse
How the community answered
(28 responses)- A79% (22)
- B21% (6)
Explanation
Option A is correct because EPON systems must balance two competing factors: fiber distance and splitting ratio. Longer fiber introduces greater optical signal attenuation, meaning each ONU receives less power - so at 20KM, the splitting ratio must be reduced from 1:32 to 1:16 to ensure sufficient received power at each terminal. Conversely, at 10KM the signal loss is lower, allowing the higher 1:32 split while still meeting minimum power budgets. Option B is incorrect because it denies this well-established engineering trade-off, which is a fundamental design constraint in PON deployments.
Memory tip: Think "distance up, splits down." The farther the light travels, the weaker it gets - so you share it among fewer customers. Double the distance (10→20KM), halve the splits (32→16).
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