We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Silver duplex LC fiber coupler with bronze body

Black Box Corporation

Black Box Fiber Optic Duplex Multimode Coupler FOT123 adapter

SKU CH-FK04-9SG2N

Duplex multimode fiber coupler joins two pairs of LC connectors in a silver bronze housing, RoHS compliant

  • Product typeOthers
  • Duplex multimode coupling links two LC fibre pairs
  • Bronze construction resists wear in patch-panel environments
  • Silver finish simplifies port identification in dense racks
  • RoHS certified materials meet restricted-substance requirements
  • Environmentally friendly design supports green procurement policies

Fiber Optic Duplex Coupler

The Black Box FOT123 adapter joins two LC duplex patch cables to extend a multimode fibre link. It suits installers and network engineers who need a straight-through connection in patch panels or wall outlets. The bronze housing meets RoHS environmental standards and ships new in silver finish. No active electronics are included.

Passive Multimode Behaviour

Signal passes through the coupler without amplification or regeneration. Insertion loss adds to the total link budget, so long runs must account for the extra attenuation. The adapter handles sustained traffic at the line rate of the connected transceivers. Performance stays consistent as long as the fibre ends stay clean and properly seated.

Compatibility Check Points

Verify that both cables use LC duplex connectors and multimode fibre matching your network specification. Confirm the patch panel or outlet accepts a feed-through adapter with this flange profile. Ensure cleaning tools and inspection scopes are available for the LC ferrules. The FOT123 does not convert between single-mode and multimode fibre types.

How it compares

Measured against everything we stock in Network Adapters & RJ45 Plugs, at today’s prices. Recalculated every night.

Price $46.99
Pricier than about 80% of the 1,221 comparable items (median $19.99).

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameBlack Box
Product typeOthers

Questions about this item

Does the FOT123 generate any noise or heat when installed in a live rack?

The FOT123 is a passive duplex multimode coupler with bronze LC connectors; it has no active electronics, fans or power supply, so it produces zero noise and negligible heat during continuous operation.

What fibre patch cables must I already own to use this coupler?

You need two duplex multimode patch cords terminated with LC connectors on the ends that will plug into the FOT123's LC female ports.

Can I connect the FOT123 directly to legacy ST or SC patch panels I still use?

No, the FOT123 only provides LC female interfaces; connecting to ST or SC equipment requires separate hybrid patch cords or adapter panels.

More in Network Adapters & RJ45 Plugs

Similar items