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HPE

HPE 845970-B21 | QSFP28-to-SFP28 QSA adapter | Enables 25G SFP28 in 100G QSFP28 slot | Passive, no retimer

SKU:845970-B21

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Description

Mechanical QSA adapter that allows a QSFP28 cage to accept a single SFP28 transceiver, enabling 25GbE links from 100G-capable ports. Ideal for incremental migrations, sparing flexibility, and matching mixed link speeds across environments. Host device must support 25G operation on QSFP28 ports; no signal retiming is performed by the adapter.

Features

- Enables 25G links from existing 100G QSFP28 ports
- Passive design for zero additional latency
- Simplifies mixed-speed migrations and sparing
- Hot‑swappable with standard SFP28 optics

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

Technical Specifications

- Host interface: QSFP28 (cage/port)
- Module interface: SFP28 (one module)
- Supported speed: 25GbE on capable hosts (platform dependent)
- Electrical design: passive adapter (no retimer/gearbox)
- Hot-swap: supported with transceiver
- Use case: operate 25G optics from 100G QSFP28 slots
- Compatibility: platform-dependent vendor coding may apply

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