The all-optical network supports smooth bandwidth upgrades from GPON to 10GGPON, and from 10GGPON to 50GGPON, and the passive ODN network does not need to change.

Question

Options

• ATrue
• BFalse

• A
  81% (25)
• B
  19% (6)

Explanation

Option A is correct because a key design principle of passive optical networks (PON) is that the Optical Distribution Network (ODN) - comprising the fiber cables, splitters, and connectors - is passive (contains no active electronics) and wavelength-agnostic, meaning it can carry different PON generations without hardware replacement.

GPON, 10GPON, and 50GPON all operate over the same physical fiber infrastructure, with the generational upgrades handled entirely at the active equipment endpoints: the Optical Line Terminal (OLT) at the central office and the Optical Network Units (ONUs) at customer premises. The passive ODN simply passes optical signals through, so it remains unchanged regardless of which PON standard is in use.

Option B is incorrect because it implies the ODN must be modified during upgrades, which contradicts the fundamental advantage of passive optical architecture - protecting the costly, buried fiber plant from technology churn.

Memory tip: Think of the ODN as "dumb pipes" - fiber and passive splitters don't care what generation of light you send through them. Only the smart endpoints (OLT/ONU) need to be swapped to upgrade speeds.

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