NVIDIA Mellanox MC2207126-004 56Gb/s VPI QSFP Passive Copper Direct-Attach Cable, 4m: This is a 4-meter passive copper direct-attach cable (DAC) terminated in QSFP connectors on both ends. The cable is engineered for 56Gb/s VPI (Virtual Protocol Interconnect) operation, supporting both InfiniBand FDR (56Gb/s) and 56GbE Ethernet on Mellanox VPI ports. This is a fixed-length integrated assembly, NOT an active optical cable, NOT a 40Gb/s QDR-only cable, and NOT a 100GbE QSFP28 cable. This unit is New.
Engineering Context
The MC2207126-004 carries 56Gb/s as four lanes of 14Gb/s NRZ over twinaxial copper conductors. As a passive cable it consumes 0W and adds no latency from active components. Passive copper at 56Gb/s FDR rate has tighter signal-integrity margins than 40G class, so cable construction targets controlled impedance and minimized insertion loss. The PVC outer jacket is intended for general data center routing. The cable provides full EMI immunity and never requires laser safety considerations.
Deployment & Use Cases
InfiniBand FDR fabric uplinks between SX6036 / IS5000-series VPI switches and ConnectX-3 / ConnectX-3 Pro VPI adapters. 56GbE Ethernet rack-internal links between Top-of-Rack and aggregation switches when both ends support 56GbE. HPC and storage clusters using FDR as the primary fabric. Lab and research compute pods running mixed VPI workloads.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MC2207126-004
Form Factor: QSFP to QSFP (Point-to-Point)
Data Rate: 56Gb/s (4x 14Gb/s NRZ)
Cable Type: Passive Copper DAC
Length: 4m
Jacket: PVC
Protocol Support: InfiniBand FDR, 56GbE Ethernet (VPI)
Power: Passive (0W)
Condition: New — Sealed by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Mellanox SX6036 and IS5000-series VPI switches and ConnectX-3 / ConnectX-3 Pro VPI adapters running at 56Gb/s. Both ends must be configured for the same protocol (InfiniBand FDR or 56GbE). NOT a QSFP28 100GbE cable — this is the older QSFP form factor at 56Gb/s. NOT compatible with EDR (100Gb/s) ports. Length is fixed at 4m. Passive copper reach is limited; for spans beyond 5m use an active optical cable such as the MC220731V series.
Why TES
T.E.S IT-SOLUTIONS verifies every passive DAC for connector seating, conductor continuity, and EEPROM identity before shipment. We provide expert consultation on FDR fabric design, global shipping, and a 1–3 day handling time. Visit tes-itsolutions.com for the full catalog.