NVIDIA Mellanox MC2207126-004 Passive Copper Cable, VPI, up to 56Gb/s, QSFP, 4m: This is a 4m passive direct-attach copper (DAC) cable for QSFP+ ports, supporting VPI operation up to 56Gb/s — InfiniBand FDR/FDR10 or 56GbE Ethernet. The cable is fully passive and requires no power from host ports. This is NOT an active copper or AOC cable, and not a transceiver. This listing is for a Lot of 3 refurbished units.
Engineering Context
The MC2207126-004 is a 4m passive QSFP-to-QSFP twinax assembly designed for short-reach intra-rack and adjacent-rack interconnects in HPC and data center fabrics. It uses copper twinax wire pairs with no active electronics, which keeps power draw at 0W per port. As a VPI cable it can be used in either InfiniBand or Ethernet mode, depending on switch and adapter configuration. Latency is in the nanosecond range — significantly lower than any optical AOC. The connectors comply with the SFF-8436 QSFP+ mechanical specification.
Deployment & Use Cases
Top-of-Rack switch to server NIC connections in HPC clusters. InfiniBand FDR/FDR10 fabric links between Mellanox switches and ConnectX-2 / ConnectX-3 adapters. 56GbE Ethernet uplinks within or between adjacent racks. Storage fabric interconnects where short reach makes optical cabling unnecessary. GPU compute node interconnect at 56Gb/s on legacy Mellanox infrastructure.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MC2207126-004
Form Factor: QSFP+ to QSFP+ (SFF-8436)
Data Rate: Up to 56Gb/s (IB FDR or 56GbE Ethernet)
Cable Type: Passive Copper Direct Attach (DAC)
Length: 4m
Protocol: InfiniBand VPI / 56GbE Ethernet
Power Draw: 0W (passive, no electronics)
Conductor: Copper twinax
Lot Size: 3 units
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with Mellanox SwitchX-2 / SX6000 series FDR switches and ConnectX-3 / ConnectX-3 Pro adapters at 56Gb/s. Compatible with ConnectX-3 / ConnectX-3 Pro / ConnectX-3 VPI adapters in FDR or 56GbE mode. NOT rated for EDR (100Gb/s) or HDR (200Gb/s) operation. Maximum data rate is 56Gb/s. Fixed 4m length; passive copper cables cannot be extended or repaired. OEM-equivalent compatibility with third-party QSFP+ ports is not guaranteed; verify with your switch vendor compatibility list before deployment.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every passive copper cable for continuity, signal integrity, and connector condition before shipment. We provide expert consultation on InfiniBand and Ethernet fabric cabling, global shipping, and 1–3 day handling. Visit tes-itsolutions.com for additional inventory and support.