QSFP-transceiver BlueOptics BO25K856S2D 40GBASE-SR2-BIDI multimode vezel 100 m

The BlueOptics BO25K856S2D is a compact QSFP optical transceiver module designed for 40GBASE-SR2-BIDI multimode fiber links up to 100 meters. Built for high-density switching and aggregation in data centers and enterprise networks, this QSFP provides bidirectional 40 Gbps connectivity over multimode fiber using two wavelengths to reduce fiber count. The small form factor and industry-standard QSFP interface enable straightforward integration into compatible switches, routers and transponders for short-range, high-bandwidth links.

Advantages

This transceiver offers bidirectional operation that halves the number of fibers required for 40 Gbps links, saving fiber infrastructure and simplifying cabling. Its multimode design supports short-range connections up to 100 meters, making it suitable for data center top-of-rack and server uplink scenarios. The QSFP form factor provides high port density and hot-pluggable convenience, while compliance with 40GBASE-SR2-BIDI signal requirements ensures interoperability with standard multimode equipment.

Suitable for

Key specifications

How to use

Insert the QSFP transceiver into a compatible QSFP port on the switch or network device while the port is powered down or observe the device's hot-swap guidance. Connect multimode duplex patch cords or appropriate fiber assemblies to the module’s optical ports, ensuring correct polarity for bidirectional operation. Configure the connected devices for 40GBASE-SR2-BIDI operation if required; many systems auto-negotiate the link. Verify link status and error counters on the switch or host device to confirm proper operation.

Recommendations

Use quality multimode fiber (OM3/OM4 as applicable) and factory-terminated patch cords to achieve the specified 100 m reach. Keep connectors clean and follow standard fiber handling practices. Match the transceiver to network equipment that supports 40GBASE-SR2-BIDI to ensure compatibility and stable operation.