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Black Box LGC135A-R3 SFP transceiver, compact silver module with RJ-45 port

Black Box Corporation

Black Box Corporation LGC135A-R3 SFP transceiver

SKU CH-3AEC-S4CGS MPN LGC135A-R3

Converts 10/100/1000Base-TX copper to 1000Base-X fiber in a compact .8"H x 1.8"W x 3.4"D enclosure with auto MDI/MDI-X and EN62368 compliance

  • Product typeTransceiver
  • Compact desktop fibre at lower cost than fibre NICs
  • Measures just 0.8"H x 1.8"W x 3.4"D for tight spaces
  • Auto MDI/MDI-X removes cable-type worries
  • Powered by universal AC supply or optional rackmount PowerTray
  • Compliant to EN62368 safety standard

Desktop Fibre Bridge

The Black Box LGC135A-R3 is a compact media converter that links copper Ethernet to an SFP fibre port. It suits offices and workgroups that need to extend a Gigabit link over fibre without replacing existing switches or fitting internal NICs. The unit accepts multi-mode or single-mode modules for flexible reach. Auto MDI/MDI-X removes cable-polarity concerns during installation.

Power And Mounting Flexibility

The converter draws power from an included universal AC adapter or an optional rack-mount PowerTray for dense deployments. Its 0.8 by 1.8 by 3.4 inch footprint fits on a desk, a DIN rail or a shelf without consuming a full rack unit. One SFP expansion slot lets you choose the transceiver that matches your fibre type and distance. No software configuration is required for basic operation.

Sustained Link Stability

Compliant to EN62368, the hardware maintains line-rate Gigabit throughput across the copper and fibre interfaces during continuous traffic. The passive cooling design has no moving parts, so acoustic noise and mechanical wear are eliminated. Auto-negotiation at 10, 100 and 1000 Mbps ensures compatibility with legacy and modern endpoints alike. The converter is built for always-on service in temperature-controlled environments.

How it compares

Measured against everything we stock in SFP & SFP+ Transceiver Modules, at today’s prices. Recalculated every night.

Price $298.99
Pricier than about 71% of the 1,471 comparable items (median $138.99).

Specifications

Product
Brand nameBlack Box Innovations
Product typeTransceiver
Size & build
Shipping weight0.34 kg
Package size222 × 140 × 64 mm

Questions about this item

Does the 1.8 inch width fit the SFP slot I already have?

This unit measures 1.8 inches wide by 3.4 inches deep, so it is a standalone media converter rather than a plug-in SFP module and will not fit inside a standard SFP cage.

How much heat does the converter produce when running 1000 Mbps fiber links continuously?

The converter has no fan and relies on passive cooling; its compact 0.8 inch height means it dissipates heat through the metal enclosure during all-day operation.

Which power source must I provide to make the RJ-45 to fiber link active?

You need the universal AC power supply included with the unit or the optional rackmountable PowerTray; the converter does not draw power from the Ethernet or fiber ports themselves.

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