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The HPE 845970-B21 is a hardware adapter (converter) that allows a 100Gb QSFP28 port to be used with 25Gb SFP28 or 10Gb SFP+ transceivers.It is a mechanical and electrical bridge used to provide flexibility in high-density networking environments where you need to connect lower-speed devices to a 100G switch or server port.
The HPE 845970-B21 is a specialized network adapter designed to convert a single high-speed QSFP28 (100Gb) port into a single SFP28 (25Gb) or SFP+ (10Gb) port.This is a "mechanical" and electrical adapter—often called a QSA28—that allows you to use lower-speed transceivers in high-density 100G switch ports without needing to change your entire infrastructure.
| Feature | Details |
| Product Name | HPE QSFP28 to SFP28 Adapter (QSA28) |
| Part Number | 845970-B21 |
| Interface (Input) | QSFP28 (100Gbps) |
| Interface (Output) | SFP28 (25Gbps) or SFP+ (10Gbps) |
| Power Consumption | Max 0.25W |
| Dimensions | 5.99 x 20.78 x 3.1 cm |
| Weight | ~90 grams (0.09 kg) |