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Black Box LFP420 SFP module silver metal housing LC simplex port

Black Box Corporation

Black Box LFP420 SFP 1250 Mbps 1550 nm TX 1310 nm Simplex SM LC

SKU CH-SD8X-DS7E7 MPN LFP420

Single-fiber SFP transceiver delivering 1250 Mbps over extended temperatures from -40 to 85 °C

  • Up to 1250 Mbps throughput for Gigabit Ethernet links
  • Single-fibre simplex LC design saves cabling space
  • Hot-pluggable SFP allows changes without powering down
  • Digital diagnostics report temperature, voltage, bias and optical power
  • Industrial temperature range from -40 °C to +85 °C

SFP transceiver for Gigabit links

This Black Box LFP420 module converts an SFP slot to a single-mode fibre interface operating at up to 1250 Mbps. It transmits at 1550 nm and receives at 1310 nm over a simplex LC connector. The unit is designed for networks where only one fibre strand is available.

Extended temperature and diagnostics under load

The transceiver maintains operation across an extended range of -40 to +85 °C (-40 to 176 °F) during sustained use. Built-in diagnostics continuously report temperature, TX and RX optical power, supply voltage and laser bias current. This visibility helps administrators monitor link health in real time.

Simplex fibre distance and compatibility limits

Because the module uses a single fibre strand with bidirectional wavelengths, reach is constrained by the link budget of the 1310 nm and 1550 nm optics. It fits standard SFP slots and is transparent to any protocol running at 1000 Mbps or below, but it cannot serve applications that require dual-fibre connections or speeds beyond 1250 Mbps.

Highlights

  • Up to 1250 Mbps throughput for Gigabit Ethernet links
  • Single-fibre simplex LC design saves cabling space
  • Hot-pluggable SFP allows changes without powering down
  • Digital diagnostics report temperature, voltage, bias and optical power
  • Industrial temperature range from -40 °C to +85 °C

Specifications

BrandBlack Box Corporation
Shipping weight0.45 kg
Package size112 × 71 × 28 mm

Questions about this item

How much heat does the LFP420 generate when running continuously at 1250 Mbps?

The module operates across an extended temperature range of -40 to 85 °C (-40 to 176 °F), so it stays within spec even under sustained load.

What must my switch provide for this SFP to work?

An SFP slot with LC duplex or simplex connectivity and support for 1310 nm receive / 1550 nm transmit wavelengths at up to 1250 Mbps.

Will the LFP420 link reliably with my older Gigabit Ethernet gear?

Yes — it is transparent to data and compatible with any network standard operating at speeds up to 1250 Mbps, including 1000-Mbps Ethernet.

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