Detailed Specifications
HPE 817721-B21 Ethernet 10Gb 2-Port 535FLR-T Adapter
Overview
The HPE 817721-B21 is a dual-port 10 Gigabit Ethernet adapter designed for server mezzanine/FLR-T slots, providing two RJ-45 10GBASE-T ports that deliver full line-rate performance per port while preserving standard PCIe slot real estate. It enables high-bandwidth uplinks over copper structured cabling (Cat6A/Cat7) and supports backward compatibility to 1 Gb/s. Advanced I/O features such as SR-IOV, tunnel offloads (VXLAN/NVGRE) and full virtualization awareness allow it to handle virtualized workloads, storage traffic, and converged infrastructure in rack servers. Ideal for environments where dual 10 Gb/s copper uplinks, efficient server I/O and simplified cabling are required, this adapter fits dense compute nodes, branch servers and rack deployments seamlessly.
Key Features
Two RJ-45 10 Gb/s (10GBASE-T) ports over standard copper cabling
Mezzanine/FLR-T form-factor designed for server integration
Support for SR-IOV, tunnel offloads, virtualization aware I/O
Backward compatible with 1 Gb/s links and existing cabling
Technical Specifications
| Specification | Value |
|---|
| Brand | HPE |
| Part Number | 817721-B21 |
| Product Type | Ethernet 10Gb 2-Port 535FLR-T Adapter |
| Port Count | 2 |
| Supported Link Speeds | 10 Gb/s per port; backward to 1 Gb/s |
| Connection Type | RJ-45 (10GBASE-T) |
| Host Interface | Mezzanine / FLR-T slot (server riser) |
| Maximum Cable Reach | Up to ~100 m on Cat6A/Cat7 (typical) |
| Advanced Features | SR-IOV, tunnel offload (VXLAN/NVGRE), VM-aware I/O |
| Typical Power Consumption | ~15.5 W typical / ~19.6 W max |
| Operating Temperature Range | 0 °C to 55 °C |
| Dimensions (approx.) | ~3.0″ × ~7.4″ × ~0.9″ (≈ 76 mm × 188 mm × 23 mm) |
| Weight | ~0.28 lb (~0.13 kg) |
| Compatible Platforms | HPE ProLiant Gen10/Plus servers (mezzanine slot) |
| Use Case | Dual 10 Gb copper uplinks in servers for virtualisation |
