HP 670759-B21 56Gb/s InfiniBand FDR QSFP Passive Copper Cable, 0.5m, Lot of 10: This is a lot of ten 0.5-meter passive copper Direct Attach Cables (DACs) engineered for 56Gb/s InfiniBand FDR (Fourteen Data Rate) point-to-point interconnectivity, originally shipped under HP part number 670759-B21 (HP spare P/N 674850-001) with the underlying cable assembly manufactured by Mellanox Technologies. This is a passive copper DAC, not an active optical cable and not a transceiver-plus-patch-cord assembly. These are refurbished units.
Engineering Context
Passive copper DACs at 0.5m provide the lowest insertion loss and lowest power profile available for 56Gb/s FDR links, drawing essentially zero additional power per port and adding no optical-to-electrical conversion latency. The 0.5m length is engineered for in-rack 1U-to-1U or switch-to-adjacent-server connectivity. FDR signals at 14.0625 Gb/s per lane across 4 lanes for an effective 56Gb/s line rate. Copper conductors avoid concerns about optical alignment, end-face contamination, and VCSEL bias-current drift over time.
Deployment & Use Cases
In-rack server-to-leaf-switch interconnects in HPC clusters running FDR fabrics. Top-of-rack QSFP storage uplinks where the storage array sits in the same rack. FDR lab and proof-of-concept test benches. Refresh cycles for legacy SwitchX and SwitchX-2 InfiniBand deployments. Bulk lot-of-ten quantity supports rack-rebuild and pod-rollout projects.
Technical Specifications
OEM: HP (cable assembly by Mellanox Technologies)
HP Part Number: 670759-B21
HP Spare P/N: 674850-001
Form Factor: QSFP to QSFP (Point-to-Point)
Data Rate: 56Gb/s InfiniBand FDR (4x 14.0625 Gb/s)
Cable Type: Passive Copper Direct Attach Cable (DAC)
Length: 0.5m
Conductor: Copper
Power Draw: Passive (no incremental host power)
Lot Quantity: 10 cables per lot
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with HP, Mellanox, and third-party QSFP FDR-capable host channel adapters and switches that accept Mellanox-coded passive copper cables. Designed for 56Gb/s InfiniBand FDR ports. Not guaranteed to negotiate higher rates such as EDR (100Gb/s) or HDR (200Gb/s). Not compatible with SFP+, SFP28, or QSFP28-only ports. Not an active optical cable; reach is fixed at 0.5m and cannot be extended. Compatibility with non-Mellanox-coded controllers should be verified before deployment.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS visually inspects connector housings and bend-radius integrity on every cable in the lot, validates link establishment on each cable, and ships within 1–3 business days from the date of order confirmation. Lot quantity discounts available on request.