NVIDIA Mellanox MCP7H00-G00B 100GbE to 2x50GbE QSFP28 to 2xQSFP28 Passive Hybrid Breakout DAC, 0.75m: This is a 0.75-meter passive copper hybrid breakout cable that splits a single QSFP28 100GbE port into two independent QSFP28 50GbE links. It is a fixed-length copper assembly with one QSFP28 head and two QSFP28 legs. This is not a 1:1 cable and not a 4-way breakout. This is a refurbished unit.
Engineering Context
The MCP7H00-G00B maps the four 25Gb/s NRZ lanes of the QSFP28 port to two QSFP28 cages, each carrying two 25Gb/s lanes for a 50GbE link per leg. The 0.75m length is engineered for intra-rack patching between adjacent rack units, where minimizing slack improves airflow and cable management in densely packed switches. Passive copper draws no power and adds negligible latency.
Deployment & Use Cases
Intra-rack 100GbE leaf switch to dual 50GbE-attached compute hosts in adjacent rack units. Connecting Spectrum SN2000/SN3000 series switches to ConnectX-4 or ConnectX-5 QSFP28 adapters configured at 50GbE. Hyperconverged or storage chassis where two 50GbE controllers reside one rack unit below the leaf.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7H00-G00B
Form Factor: QSFP28 to 2xQSFP28 (Breakout)
Cable Type: Passive Direct Attach Copper Hybrid
Data Rate: 100GbE → 2x50GbE
Length: 0.75m
Conductor: 30 AWG
Jacket: PVC
Lane Mapping: 4x25G → 2x(2x25G NRZ)
Protocol: Ethernet (100GbE breakout / 2x50GbE)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Requires the QSFP28 switch port to be configured for 2x50G breakout mode; verify firmware support on the specific switch model. The QSFP28 legs must connect to adapters configured at 50GbE — link training at 100GbE on a leg will fail because only two lanes are available. Not compatible with 40GbE QSFP+ ports. The 0.75m fixed length is intended for adjacent rack-unit placements; longer reach requires the 1m, 1.5m, or 2m variants in the MCP7H00 family.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS link-tests each leg at 50GbE and verifies the QSFP28 head before shipment. Visit tes-itsolutions.com for global shipping with 1–3 day handling.