In a PTP network using optical fiber, the ________ is responsible for media conversions from the optical fiber to the balanced twisted pair network within the residence.

Question

Options

• AONU
• BOS
• CONT
• DOLT
• EOLTS

• A
  17% (5)
• B
  3% (1)
• C
  73% (22)
• D
  7% (2)

Explanation

ONT (Optical Network Terminal) is correct because it is the customer-premises device specifically designed for residential use that performs the media conversion from incoming optical fiber to the balanced twisted pair (copper) wiring used inside the home. In a PTP topology, each residence has a dedicated fiber run, and the ONT is the termination point for that fiber at the customer side.

Why the distractors are wrong:

• A. ONU (Optical Network Unit) - functionally similar to an ONT but used in Point-to-Multipoint (PON) environments, typically serving multiple users at a neighborhood node, not within a single residence.
• B. OS (Optical Splitter) - a passive device that splits one fiber signal into multiple branches in PON networks; it does not perform media conversion.
• D. OLT (Optical Line Terminal) - lives at the service provider's central office/headend and manages the fiber network outward; it is the origin of the fiber link, not the residential endpoint.
• E. OLTS (Optical Loss Test Set) - a field measurement instrument used to test signal loss in fiber cables, not a network component at all.

Memory tip: Think "ONT = On-premises Network Terminal" - the T in ONT stands for Terminal, meaning it terminates the fiber at the home and hands off to copper. OLT terminates at the Line side (provider); ONT terminates at the customer side.

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