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.
Frequently Asked Questions (FAQ)
Q. What is the MCP7H00-G00B?
The MCP7H00-G00B is a 0.75m passive copper splitter DAC: one QSFP28 head at 100GbE breaks out into two 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-G00B 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 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.