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Small rectangular SFP+ module with duplex LC ports and metallic housing

D-Link

D-Link DEM-431XT 10GBase-SR SFP+ transceiver 850nm

SKU CH-EKJ7-Q50H3

A 10 Gbps SFP+ transceiver for multimode fibre up to 300 m with duplex LC connectors

  • StandardsIEEE-802.3ae
  • Wavelength850nm
  • Fiber Cable50/125µm, 62.5/125µm
  • ProtocolsTCP/IP
  • PortsDuplex LC Connector
  • Max Distance62.5 μm, 160 MHz-km: 26 m 62.5 μm, OM1 200 MHz-km: 33 m 50 μ
  • 10 Gbps throughput over multimode fibre
  • Duplex LC connector for standard patch cables
  • Reaches 300 metres on OM3 2000 MHz·km fibre
  • Operates at 850 nm wavelength across 0–70 °C
  • IEEE 802.3ae compliant for 10GBase-SR networks

10GBase-SR SFP+ transceiver for short-reach links

The D-Link DEM-431XT is a hot-pluggable SFP+ module built for 10 Gbps Ethernet over multimode fibre. It targets data-centre and campus networks that need reliable 10G uplinks within a single rack or building. The duplex LC interface fits standard patch panels and switch ports without adapters.

Thermals noise and power in normal use

The module operates from 0 °C to 70 °C without active cooling, so it runs silently in populated chassis. Power draw stays within the SFP+ MSA limit, leaving headroom for dense port configurations. No fan or heatsink is required, which keeps airflow paths clear in 1 U switches.

Build quality and day-to-day implications

A metal housing shields the optics and meets the 802.3ae mechanical spec for repeated insertion cycles. The duplex LC connector uses a push-pull latch that resists vibration in cabinet environments. At 0.47" high and 2.22" deep it fits side-by-side in high-density cages, while the 0.04 lb weight adds negligible stress to the host board.

Highlights

  • 10 Gbps throughput over multimode fibre
  • Duplex LC connector for standard patch cables
  • Reaches 300 metres on OM3 2000 MHz·km fibre
  • Operates at 850 nm wavelength across 0–70 °C
  • IEEE 802.3ae compliant for 10GBase-SR networks

Specifications

BrandD-Link
ModelDEM-431XT
StandardsIEEE-802.3ae
Wavelength850nm
Fiber Cable50/125µm, 62.5/125µm
ProtocolsTCP/IP
PortsDuplex LC Connector
Max Distance62.5 μm, 160 MHz-km: 26 m
62.5 μm, OM1 200 MHz-km: 33 m
50 μm, 400 MHz-km: 66 m
50 μm, OM2 500 MHz-km: 82 m
50 μm, OM3 2000 MHz-km: 300 m
Transfer Rate10 Gbps
Dimensions0.47" x 0.58" x 2.22" (H x W x D)
Weight0.04 lb.

Questions about this item

How do I insert the DEM-431XT into an SFP+ slot and what step is often missed?

Slide the module in until the latch clicks, then remove the dust caps before plugging in the duplex LC cables.

What part will need replacement first as the transceiver ages?

The 850 nm laser diode degrades over time and will eventually require swapping the whole module.

What distance limit appears first when running 10 Gbps continuously over OM1 fibre?

The 33 m reach on 62.5 µm OM1 fibre is the shortest supported span.

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