NVIDIA Mellanox MC2207128-0A2 2m QSFP+ Passive Copper Cable: This is a 2-meter passive copper QSFP+ to QSFP+ Direct Attach Cable supporting up to 56Gb/s VPI, usable for FDR InfiniBand or 56GbE Ethernet. It is a fixed-length factory-terminated assembly, not a transceiver-with-fiber-patch-cord. This is a new unit.
Engineering Context
The MC2207128-0A2 carries 4 lanes of 14Gb/s NRZ over heavy-gauge twinax copper to deliver up to 56Gb/s aggregate throughput. Passive cables consume zero port power and add only nanosecond-class propagation latency, making them the preferred short-reach option inside a single rack. EMI-resistant by virtue of full-shielded twinax construction. No optics to clean and no AOC engine to fail. BER conforms to IBTA / IEEE specifications for the 14Gb/s NRZ lane standard.
Deployment & Use Cases
ConnectX-3 / ConnectX-3 Pro VPI adapter to SX series FDR InfiniBand switch links. Top-of-Rack to compute node 56GbE Ethernet within a single rack. Storage HBA fabric uplinks on FDR-era arrays. Spine-leaf interconnects between adjacent racks. HPC short-reach scale-out where reach is under 3m.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MC2207128-0A2
Form Factor: QSFP+ to QSFP+
Data Rate: Up to 56Gb/s VPI (4x14Gb/s NRZ)
Cable Type: Passive Copper Direct Attach (DAC)
Length: 2 meters
Protocols: FDR InfiniBand, 56GbE Ethernet (VPI)
Power Draw: 0W (passive)
Connector Lock: Pull-tab QSFP+
Condition: New
Compatibility & Hard Constraints
Compatible with NVIDIA / Mellanox ConnectX-3 and ConnectX-3 Pro VPI adapters and SX series FDR switches when ports are rated for 14Gb/s per lane. Compatible with 56GbE-rated Ethernet switches running QSFP+ ports. Not compatible with QSFP28 100GbE ports (which use 25Gb/s per lane signaling). Not compatible with SFP+/SFP28 ports without a breakout (no breakout supplied). Fixed 2m length — no field-length adjustment. EDR (25Gb/s per lane) ports may negotiate down to lower rates, but throughput is bounded by the cable's 14Gb/s per lane signaling rating.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies cable continuity, shield integrity, and latch operation on every MC2207128-0A2 before dispatch. See tes-itsolutions.com for compatibility consultation, multi-unit pricing, and 1–3 day handling on stocked items.