NVIDIA Mellanox MCP7H60-W003R26 400GbE QSFP-DD to 2x200GbE QSFP56 Splitter DAC, 3m 26AWG: This is a 3-meter passive copper splitter cable that breaks one 400GbE QSFP-DD port out into two 200GbE QSFP56 ports. The cable uses 26AWG twinax copper conductors. This IS a 1-to-2 splitter; this is NOT a straight QSFP-DD-to-QSFP-DD 400GbE cable. This is a New unit.
Engineering Context
The MCP7H60-W003R26 carries 8 lanes at 50Gb/s PAM4 on the QSFP-DD end and splits them into two 4-lane QSFP56 200Gb/s connections. At 3 meters and 26AWG, the cable falls within passive copper reach for 50G PAM4 lanes when paired with switches and adapters supporting compliant FEC. Splitter cables enable port-density consolidation: a single 400GbE switch port can host two 200GbE servers without active optics. Twinax copper provides the lowest latency interconnect option at this distance.
Deployment & Use Cases
Top-of-Rack consolidation: connecting a 400GbE Spectrum-3 SN4000 switch port to two 200GbE ConnectX-6 servers. AI training pods where one switch port serves two 200GbE GPU nodes. High-density storage interconnect from 400GbE aggregation switches to 200GbE storage controllers. Hyperscale leaf-tier port consolidation to maximize 400G switch radix.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number (MPN): MCP7H60-W003R26
Form Factor: QSFP-DD to 2x QSFP56 (Splitter)
Data Rate: 400GbE → 2x 200GbE (8x 50Gb/s PAM4)
Cable Type: Passive Direct Attach Copper (DAC), Twinax
Length: 3m
Conductor Gauge: 26 AWG
Protocol: 400GbE Ethernet split to 2x 200GbE
Power: Passive (zero power consumption)
Condition: New — Sealed by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with NVIDIA Spectrum-3 SN4000 series 400GbE switches on the QSFP-DD end and ConnectX-6 200GbE adapters on the QSFP56 ends. Requires the host switch to support 2x200GbE breakout configuration on the QSFP-DD port. Not compatible as a straight 400G-to-400G cable. Not compatible with InfiniBand fabrics. Not compatible with passive 100Gb/s NRZ ports. 26AWG passive limits this to short-reach in-rack deployments only.
Frequently Asked Questions (FAQ)
Q. What is the MCP7H60-W003R26?
The MCP7H60-W003R26 is a 3m passive copper splitter DAC: one QSFP-DD head at 400GbE breaks out into two QSFP56 legs at 200GbE each.
Q. Does the switch need special configuration?
Yes. The head port must be configured for breakout mode.
Q. Will T.E.S IT-SOLUTIONS confirm the configuration of MCP7H60-W003R26 before shipping?
Yes. T.E.S IT-SOLUTIONS (tes-itsolutions.com) bench-tests each unit where test topology is available, before dispatch from EU stock.

Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies every splitter DAC for connector seating, lane continuity, and FEC alignment before shipment. Visit tes-itsolutions.com for 1–3 business day handling, global shipping, and consultation on 400GbE breakout topologies.