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Adafruit
Adafruit 40GBASE-SR4 QSFP+ Optical Transceiver 2 in 1 accessory
A 40GBASE-SR4 QSFP+ transceiver with four 11.2Gbps channels, 850nm optics for 100m over multimode fibre, digital diagnostics, 1.2W max draw and 0 to 70C operating range
- 40 Gbps total bandwidth from four 11.2 Gbps channels
- Low 1.2 W draw extends module service life
- Real-time DDM gives instant link diagnostics
- Hot-pluggable QSFP+ fits existing SFF-8436 cages
- Operates 0–70 °C (32–158 °F) commercial range
40G QSFP+ transceiver for short-reach links
This 40GBASE-SR4 QSFP+ module delivers four full-duplex channels at up to 11.2 Gbps each over multimode fibre. It targets network engineers upgrading aggregation or breakout links in data-centre switches. The hot-pluggable form factor allows insertion without powering down the chassis. Buyers needing single-mode reach or 100G density should look elsewhere.
1.2 W draw with 0 to 70 °C operating range
Maximum power consumption is 1.2 W, keeping thermal load low inside dense switch line-cards. Commercial temperature rating spans 0 to 70 °C (32 to 158 °F) for standard rack environments. Built-in digital diagnostics provide real-time optical monitoring for link health. No active cooling or external heatsink is required by the module itself.
MPO-12 connector and breakout support
The transceiver uses an MPO-12/UPC interface on 850 nm multimode fibre for 100 m reach. It supports 40G to 4x 10G breakout cabling for flexible port mapping. Compliance with IEEE 802.3ba, SFF-8436 and QSFP MSA ensures mechanical and electrical interoperability. No configuration software or licence keys are bundled with the hardware.
Highlights
- 40 Gbps total bandwidth from four 11.2 Gbps channels
- Low 1.2 W draw extends module service life
- Real-time DDM gives instant link diagnostics
- Hot-pluggable QSFP+ fits existing SFF-8436 cages
- Operates 0–70 °C (32–158 °F) commercial range
Specifications
No published specifications for this item yet.
Questions about this item
How do I install the QSFP+ transceiver into my switch and what step is often missed?
Insert the hot-pluggable QSFP+ module into the switch port until it clicks, then connect the MPO-12/UPC cable. The step often missed is verifying the EEPROM coding matches the switch brand so the link initialises correctly.
What maintenance or replacement will the 40GBASE-SR4 module need over time?
The module has no user-serviceable parts. With a maximum power draw of 1.2 W and a commercial temperature range of 0 to 70 °C (32 to 158 °F), it is designed for prolonged service life; replacement is only required if a channel fails or the DDM diagnostics report degrading optical performance.
What limit appears first when the transceiver runs at full load continuously?
The 1.2 W power ceiling and the 0 to 70 °C operating range are the first constraints under sustained use; each of the four channels runs at up to 11.2 Gbps, and the 850 nm multimode link is rated for 100 m on OM3/OM4 fibre.
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