HP Enterprise QSFP28 to SFP28 Adapter 845970-B21-RFB — port conversion module

HP Enterprise QSFP28 to SFP28 Adapter 845970-B21-RFB — port conversion module allows deployment of 25GbE SFP28 transceivers in systems equipped with QSFP28 ports. This physical adapter converts a single QSFP28 cage to support an SFP28 module, providing compatibility where QSFP28 interfaces are present but SFP28 optics are required. The adapter is intended for use with compatible HP Enterprise networking equipment and follows the manufacturer's MPN 845970-B21-RFB and EAN 5706998971944 for identification.

Advantages

The adapter permits reuse of existing SFP28 optics in QSFP28-enabled switches or line cards without modifying chassis hardware. It simplifies infrastructure upgrades by enabling flexible port assignment and reduces the need for additional switch purchases when migrating to 25GbE. The module is compact and designed to fit standard QSFP28 cages, maintaining physical alignment and electrical connectivity required for SFP28 transceivers.

Suitable for

• Integrating 25GbE SFP28 optics into QSFP28-port switches or routers
• Flexible port utilization in data center top-of-rack and leaf-spine architectures
• Testing and lab environments where SFP28 modules must be used in QSFP28 cages
• Incremental infrastructure upgrades from 10GbE to 25GbE without replacing all switch hardware

Key specifications

• Brand: HP Enterprise
• Manufacturer part number (MPN): 845970-B21-RFB
• EAN: 5706998971944
• Function: QSFP28 to SFP28 physical adapter (port conversion module)
• Supported optics: SFP28 transceivers (25GbE) used in QSFP28 ports when supported by host hardware

How to use

Power down or follow hot-swap guidelines for your specific HP Enterprise switch or line card before inserting the adapter if the platform documentation requires it. Insert the QSFP28-to-SFP28 adapter into the target QSFP28 cage until it seats fully and secures per the chassis mechanical retention. Then insert the SFP28 transceiver into the adapter’s SFP28 receptacle until it latches. Verify link and port status in the host device management interface and confirm compatibility with the switch firmware to ensure proper operation.

Recommendations

Confirm that the HP Enterprise host device firmware and hardware platform support use of QSFP28-to-SFP28 adapters and the specific SFP28 transceiver model. Follow HP Enterprise compatibility matrices and field notices where applicable, and handle optics and adapters using electrostatic discharge (ESD) precautions and dust covers when not in use.