Digitus 100Gbs QSFP28 SR4 Optical Transceiver Fiber optic SFP28 100000 Mbit/s

The Digitus DN-81631 QSFP28 SR4 is a hot-pluggable, four-channel parallel fiber-optic transceiver designed for IEEE 802.3bm 100GBASE-SR4 applications and compatible with certain 40GbE and InfiniBand FDR/EDR links. It uses an 850 nm VCSEL laser array and an MPO connector receptacle to support multimode fiber links, offering aggregate data throughput up to 100 Gbit/s (4 × 25 Gbit/s nominal per lane, up to 26 Gbit/s per channel) and reach up to 70 m over OM3 and 100 m over OM4 multimode fiber. The module is RoHS compliant, supports digital diagnostics, and operates from a 3.3 V supply with typical power consumption below 3.5 W.

Advantages

The QSFP28 SR4 module provides four independent full-duplex channels in a single hot-pluggable QSFP form factor, increasing port density and reducing overall system cost. Low power consumption and a compact 3.3 V design simplify thermal and power planning. Built-in digital diagnostics enable real-time monitoring of optical and electrical parameters.

Suitable for

• 100GBASE-SR4 multimode fiber links in data centers and aggregation layers
• High-density switch and router ports where space and power efficiency are required
• Parallel fiber applications using MPO ribbon cables
• Compatibility scenarios with 40GbE or InfiniBand FDR/EDR where supported

Key specifications

• Manufacturer: DIGITUS, model DN-81631
• Form factor: QSFP28, hot-pluggable
• Data rate: up to 100 Gbit/s aggregate (up to 26 Gbit/s per channel)
• Wavelength: 850 nm VCSEL
• Reach: up to 70 m on OM3 MMF, up to 100 m on OM4 MMF
• Connector: MPO receptacle
• Power supply: 3.3 V; power consumption <3.5 W
• Operating case temperature: 0°C to +70°C
• Compliance: RoHS 6

How to use

Insert the QSFP28 SR4 module into a compatible QSFP28 port on a switch, router or host adapter while the system is powered on (hot-pluggable). Connect an MPO/MT-RJ ribbon multimode fiber cable to the module's MPO receptacle, ensuring correct polarity and alignment. Verify link status and diagnostics through the host device's management interface and monitor the digital diagnostic outputs for optical power, temperature and voltage parameters.

Recommendations

Use OM3 or OM4 multimode fiber with an MPO connector for best performance; ensure fiber polarity and cleanliness before insertion. Observe the module's operating temperature range and provide adequate cooling in high-density deployments. Confirm compatibility with the host system firmware and transceiver support lists to avoid interoperability issues.