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Small metallic SFP transceiver with silver LC simplex port and black bail latch

Black Box Corporation

Black Box Corporation LFP421 SFP adapter 1.25 Gbps 1310 nm TX 1550 nm RX simplex single-mode 10 km LC

SKU CH-48DB-JBYG9 MPN LFP421

Single-mode SFP transceiver for 1.25 Gbps links over 10 km simplex fibre with LC connector

  • Product typeSFP
  • DetailsAltitude: 5905 ft (1800 m) Approvals: CMSA, Class 1 laser-sa
  • Key featuresThis SFP optical transceiver enables you to adapt an SFP slo
  • Product dimensions2.75 in × 0.69 in × 0.59 in
  • Product weight0.05 lb (0.02 kg)
  • Adapts an SFP slot to simplex single-mode fiber at 1.25 Gbps
  • Transparent to data for compatibility with any standard up to 1250 Mbps
  • Extended diagnostics and operating range from -40 to 85 °C
  • Class 1 laser safety per IEC 825 and CMSA approval
  • Compact 2.75 × 0.69 × 0.59 in form factor weighing 0.05 lbs

SFP transceiver for 1.25 Gbps links

The Black Box LFP421 is a new SFP optical transceiver that converts an SFP cage into a single-mode fiber interface. It operates at 1.25 Gbps with 1310 nm transmit and 1550 nm receive wavelengths over a simplex LC connection rated for 10 km.

Suits links needing extended diagnostics

Network engineers who require digital diagnostic monitoring and operation from -40 °C to 85 °C will find this module fits. Buyers who need multi-mode fiber, dual-fiber connectors, or speeds beyond 1250 Mbps should look at other transceivers.

Handles 10 km single-mode spans at 1250 Mbps

The transceiver comfortably covers point-to-point links up to 10 km on standard single-mode fiber at the rated line rate. It runs out of reach beyond that distance or when the link demands higher bandwidth or a different wavelength plan.

How it compares

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

Price $67.99
Pricier than about 84% of the 1,221 comparable items (median $19.99).

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Specifications

Product
Brand nameBlack Box
Model nameLFP421
Product typeSFP
Size & build
Product dimensions2.75 in × 0.69 in × 0.59 in
Product weight0.05 lb (0.02 kg)
Shipping weight0.02 kg
Package size108 × 64 × 25 mm

Questions about this item

Which SFP slot form factor does the LFP421 need to fit into?

The LFP421 is an SFP transceiver that plugs directly into any standard SFP cage on a switch, router or media converter.

Will the 1310 nm TX and 1550 nm RX wavelengths work with legacy 1.25 Gbps single-mode links?

Yes, because the module is transparent to data, it interoperates with any network standard running up to 1250 Mbps on matching single-mode fiber.

How can I verify the LFP421 is operating correctly after installation?

Check the extended diagnostics registers through your host equipment; they report real-time temperature, voltage, laser bias current and optical power levels.

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