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FOA CFOS/H: Fiber optic components for the home: cable, connectors and hardware

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Fiber optic components for the home: cable, connectors and hardware

Domain 2 - Fiber optic components for the home: cable, connectors and hardware

This domain tests whether you can specify the right drop cable, connector, polish and hardware for a residential install, and whether you understand the ratings and compatibility rules that make an installation compliant and reliable.

Cable

  • Indoor drop cable is typically flat 2.0 × 3.0 mm tight-buffered cable with aramid strength members and G.657 fiber.
  • Jacket ratings: OFNR for risers, OFNP for plenums and air-handling spaces, LSZH where low smoke and halogen content matter.
  • Outdoor drop cable is UV-stabilized and water-blocked (gel or dry), often with a messenger or a tonable jacket.
  • Never substitute indoor cable outdoors or in a plenum; never run bare fiber without a protective jacket inside walls.

Connectors and polish

  • SC/APC: green body, 8° angled ferrule, return loss ≥60 dB; the standard for FTTH drops and ONTs.
  • SC/UPC: blue body, physical contact, RL ≥50 dB; LC/UPC and LC/APC for high-density patch panels and some ONTs.
  • Insertion loss targets: ≤0.3 dB typical, 0.5 dB maximum per mated pair.
  • Options include factory preterminated, fusion-spliced pigtails, field-installable connectors and mechanical splices; each needs a matched consumable kit.

Hardware

  • Fiber outlet/faceplate, ONT enclosure or bracket, splitter module, splice tray, slack storage spool, conduit and raceway, fiber-safe staples, firestop putty, pulling eye and lubricant.

Worked example

A 30 m basement-to-first-floor run needs a preterminated SC/APC drop for a GPON ONT. Choose 2.0 × 3.0 mm LSZH G.657.A2 cable because it runs inside a wall and must tolerate tight corners; specify green SC/APC connectors to match the ONT port; add a pulling eye, 1 m slack at each end and a fiber outlet at the room end. UPC patch cords are rejected because mating UPC to APC produces high loss and can damage the angled ferrule.

Traps

  • Mating APC to UPC and blaming the resulting loss on a bad splice.
  • Using coax staples or tight cable ties that crush the drop.
  • Forgetting that plenum and riser ratings are about the installed space, not the cable's color.
  • Buying field-installable connectors without the matching cleaver, holder and splice-on kit.