NVIDIA Mellanox MCP7H00-G01B Passive Hybrid Copper Cable, 100GbE QSFP28 to 2x50GbE QSFP28, 1.75m: This is a 1.75-meter passive copper splitter cable that breaks one 100GbE QSFP28 port into two 50GbE QSFP28 connections. It is built for short, in-rack 100-to-2x50GbE breakout topologies on supported NVIDIA Spectrum and ConnectX platforms. This is a passive direct-attach copper assembly, not an active optical or transceiver-based cable. This is a refurbished unit.
Engineering Context
The MCP7H00-G01B carries 4 lanes of 25Gb/s NRZ on the QSFP28 head and splits them into two QSFP28 tails of 2 lanes each, with each tail running 50Gb/s (2x25Gb/s NRZ). Built with 30AWG copper twinax, the cable provides electrical reach typical of passive 1.75m copper assemblies and avoids the power and latency overhead of optics. The assembly is hot-pluggable and fully shielded to limit EMI within densely populated racks.
Deployment & Use Cases
Top-of-Rack Spectrum switch ports broken out to two 50GbE downlinks for ConnectX-5/-6 servers running RoCEv2 storage workloads. Compute-to-storage fan-out where each ToR 100GbE port serves two 50GbE NVMe-oF targets. In-rack consolidation of 50GbE-only NICs onto a smaller pool of 100GbE switch ports to maximize panel utilization.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7H00-G01B
Form Factor: QSFP28 to 2x QSFP28 (Hybrid Splitter)
Data Rate: 100GbE breakout to 2x 50GbE
Lane Layout: Source 4x25G NRZ; Tails 2x25G NRZ each
Cable Type: Passive Direct Attach Copper (DAC)
Conductor: 30AWG twinax
Length: 1.75m
Protocol: 100GbE / 50GbE Ethernet
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Designed for NVIDIA Spectrum SN2000/SN3000 ToR switches with 100GbE ports configured for breakout, paired with ConnectX-4/-5/-6 50GbE NICs on the tail ends. Requires the source switch port to be explicitly set to 2x50GbE breakout mode in firmware/CLI. The two tails cannot operate as independent 100GbE links — only one 100GbE source side is supported. Not compatible with 40GbE-only ports and not intended for InfiniBand operation. Fixed 1.75m length, no field re-termination.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every cable for continuity, lane integrity, and connector seating before shipment. Visit tes-itsolutions.com for global shipping, expert consultation on Ethernet breakout topologies, and 1–3 day handling on in-stock inventory.