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.
Frequently Asked Questions (FAQ)
Q. What is the MCP7H00-G01B?
The MCP7H00-G01B is a 1.75m passive copper hybrid cable: one QSFP28 head at 100GbE breaks out into two QSFP28 legs at 50GbE 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 MCP7H00-G01B 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 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.