HPE 845970-B21

QSFP28 to SFP28 Network Adapter

The HPE 845970-B21 QSFP28 to SFP28 Network Adapter is a compact and versatile form-factor converter that enablesseamless interoperability between high-speed QSFP28 ports and lower-speed SFP28 modules. Designed for enterprise network engineers and IT professionals, this adapter allows a 100G-capable QSFP28 interface to accept a single-lane SFP28 transceiver, enabling connections at 25G or 10G speeds using existing SFP28 infrastructure. It solves migration challenges and improves port flexibility by reducing the need for immediate switch or cabling overhauls. Ideal for environments deploying HPE Synergy, StoreFabric, or CX series fabrics, the module ensures continued compatibility while enabling phased upgrade paths—prolonging hardware lifespan and delivering cost-effective network scalability without compromising performance.

Features

In dynamic data center environments undergoing gradual network modernization, the HPE -B21 adapter serves as a key transitional component. By converting a QSFP28 port—typically leveraging four 25G lanes—into a single SFP28-compatible link, the adapter allows older or lower-bandwidth SFP28 optics to function in newer 100G QSFP28 slots. This facilitates cost-effective deployment of new switching architecture (e.g., StoreFabric SN2100M, Synergy 12000, or CX 8360-48XT4C v2) while maintaining operational continuity with existing cabling and optics . The adapter is hot-pluggable and compliant with QSFP28 and SFP28 MSA standards, supporting up to 25G data rates with low power consumption (~0.25W) Its compact housing is suitable for high-density racks and provides a smooth migration path from legacy 25G or 10G deployments to fully realized 100G infrastructures.

Advanced Options

Engineered for enterprise-class performance and flexibility, the HPE 845970-B21 adapter delivers reliable link compatibility between QSFP28 slots and SFP28 optics. With an industry-standard form factor, it enables effortless hot-swapping in live environments—minimizing downtime and preserving mission-critical operations. Its negligible power draw (~0.25 W) maintains thermal efficiency, a key factor in high-density server or switch configurations . Compatibility spans a range of HPE hardware, including StoreFabric SN2100M platforms, Synergy 12000 enclosures, and CX 8360-48XT4C v2 switch fabric modules .