350-501 Architecture Practice Question
An SP is designing a GPON access network. Which technology allows multiple ONUs to share the same fiber using different wavelengths for upstream and downstream?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Wavelength Division Multiplexing (WDM)
GPON uses Wavelength Division Multiplexing (WDM) with different wavelengths for downstream (1490nm) and upstream (1310nm) on the same fiber.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ethernet PON (EPON)
Why it's wrong here
EPON is a different standard, but still uses WDM.
- ✗
Time Division Multiple Access (TDMA)
Why it's wrong here
TDMA is used for upstream bandwidth allocation, but wavelength sharing is via WDM.
- ✗
Code Division Multiple Access (CDMA)
Why it's wrong here
CDMA is not used in GPON.
- ✓
Wavelength Division Multiplexing (WDM)
Why this is correct
Correct. WDM allows bidirectional communication over a single fiber using different wavelengths.
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