NVIDIA Mellanox MCP7F00-A01A 100GbE to 4x25GbE QSFP28 to 4xSFP28 Passive Hybrid Breakout DAC, 1.5m: This is a 1.5-meter passive copper hybrid breakout cable that splits a single QSFP28 100GbE port into four independent SFP28 25GbE links. It is a fixed-length copper assembly with one QSFP28 head and four SFP28 legs. This is not a 1:1 cable and not an active optical cable. This is a refurbished unit.
Engineering Context
The MCP7F00-A01A maps the four 25Gb/s NRZ lanes of the QSFP28 port to four separate SFP28 cages, each carrying one 25GbE link. This permits a single 100GbE switch port to fan out to four 25GbE servers, increasing port density without requiring additional switch silicon. The cable is passive copper, drawing no power and introducing negligible latency. Colored pulltabs on the four SFP28 legs aid identification when patching into densely populated 25GbE-capable adapters.
Deployment & Use Cases
Spectrum SN2000/SN3000 100GbE Top-of-Rack switches breaking out to 25GbE-attached servers running ConnectX-4 Lx, ConnectX-5, or ConnectX-6 Lx single-port SFP28 adapters. Aggregation of 25GbE storage targets behind a 100GbE leaf. Hyperconverged infrastructure where rack server NICs are 25GbE and the leaf layer is 100GbE.
Technical Specifications
- OEM: NVIDIA Mellanox
- Part Number: MCP7F00-A01A
- Form Factor: QSFP28 to 4xSFP28 (Breakout)
- Cable Type: Passive Direct Attach Copper Hybrid
- Data Rate: 100GbE → 4x25GbE
- Length: 1.5m
- Conductor: 30 AWG
- Jacket: PVC
- Pulltabs: Colored for leg identification
- Protocol: Ethernet (100GbE breakout / 4x25GbE)
- Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Requires the QSFP28 switch port to be configured for 4x25G breakout mode; not all switches or firmware revisions support fan-out on every port. SFP28 legs must terminate at 25GbE-capable adapters; a 25GbE leg cannot be link-trained at 100GbE. Not compatible with 40GbE QSFP+ to 4x10GbE SFP+ scenarios — that is a different part. This is a copper passive cable; reach beyond 1.5m requires an AOC breakout assembly. Fixed 1.5m length.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS link-tests each leg at 25GbE and verifies the QSFP28 head before shipment. Visit tes-itsolutions.com for global shipping with 1–3 day handling.