NVIDIA Mellanox MCP7H60-W003R26 400GbE QSFP-DD to 2x 200GbE QSFP56 Passive Copper Splitter Cable, 3m, 26AWG: This is a passive copper direct attach (DAC) splitter cable that breaks one 400GbE QSFP-DD port into two 200GbE QSFP56 connections. The total length is 3 meters with 26AWG copper conductors. This is a passive 1-to-2 breakout cable, not an active optical cable and not a 1-to-1 QSFP-DD straight cable. This is a refurbished unit.
Engineering Context
The MCP7H60-W003R26 uses 8x50G PAM4 lanes on the QSFP-DD end, splitting them into two QSFP56 ports each carrying 4x50G PAM4 lanes for 200Gb/s. As a passive copper assembly, it requires no power and adds zero latency from active electronics. 26AWG conductors balance reach and bend radius for top-of-rack deployments. Bit error rate is dependent on link FEC; the cable is rated for use with KP4 FEC enabled by default on supported switches and NICs. Insertion loss budget is consumed by the 3m run plus connector terminations.
Deployment & Use Cases
Top-of-Rack 400GbE QSFP-DD switch ports breaking out to two 200GbE servers in the same rack. Aggregating dual ConnectX-6 / ConnectX-7 200GbE adapters into a single high-radix switch port. Spine-to-leaf 200GbE links from a 400GbE QSFP-DD spine. Density-optimized cabling in AI/ML clusters where each compute node has 200GbE QSFP56.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7H60-W003R26
Cable Type: Passive Copper DAC Splitter
Connector A: QSFP-DD (8x50G PAM4)
Connector B: 2x QSFP56 (4x50G PAM4 each)
Aggregate Data Rate: 400GbE breaking to 2x 200GbE
Length: 3 meters
Conductor Gauge: 26AWG
Power: Passive (no power draw)
FEC: KP4 FEC required on supported equipment
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Requires a switch port that supports QSFP-DD breakout to 2x 200GbE QSFP56 (e.g., NVIDIA Quantum-2 / Spectrum-3 platforms with breakout firmware enabled). Not compatible with 4x100GbE breakout configurations on the QSFP-DD side without different cable SKU. Both QSFP56 endpoints must be 200GbE-capable; this cable does not work as a 1-to-1 QSFP-DD straight cable. Passive copper at 3m with 26AWG; reach is fixed and cannot be extended. KP4 FEC is required for reliable operation. Not suitable for runs longer than 3m — for longer reach, an active or AOC variant is required.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every DAC for connector integrity, lane continuity, and EEPROM identity before shipment. We provide expert consultation on high-speed Ethernet breakout cabling, global shipping, and 1–3 day handling. Visit tes-itsolutions.com for our full catalog.