NVIDIA Mellanox MCP7F00-A003 100GbE QSFP28 to 4x25GbE SFP28 Passive Copper Splitter Cable, 3m: This is a 3-meter passive direct attach copper (DAC) hybrid splitter that breaks one 100GbE QSFP28 port into four independent 25GbE SFP28 links. The cable is a fixed-length integrated assembly, not a transceiver pair with patch cords. This is a NEW unit.
Engineering Context
The MCP7F00-A003 uses 28 AWG twinaxial copper conductors in a 1:4 hybrid splitter topology. The host QSFP28 end aggregates 4 lanes at 25.78125 Gb/s NRZ (100 Gb/s total); each SFP28 branch carries one lane at 25 Gb/s (25GbE). As a passive cable it draws no power and adds negligible latency. Lane-mapping is fixed in the connector paddle cards, so each SFP28 branch is logically tied to one of the four QSFP28 lanes.
Deployment & Use Cases
Doubling and quadrupling effective port density on 100GbE Spectrum switches by serving four 25GbE hosts from one QSFP28 switch port. Connecting 25GbE ConnectX adapters to 100GbE Top-of-Rack switches. Storage spine aggregation feeding multiple 25GbE NVMe-oF initiators. Mixed-speed leaf designs in cloud and enterprise data centers.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7F00-A003
Cable Type: Passive Direct Attach Copper Hybrid Splitter (1:4)
Form Factor: QSFP28 to 4x SFP28
Length: 3m
Host Data Rate: 100GbE (4x 25.78125 Gb/s NRZ)
Branch Data Rate: 25GbE per branch
Conductor: 28 AWG Twinaxial Copper
Protocol: Ethernet (IEEE 802.3by 25GbE)
Condition: New — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with NVIDIA Spectrum SN2000/SN3000/SN4000 series Ethernet switches and ConnectX-4/5/6 Lx EN adapters that accept Mellanox-coded passive splitter DACs. Requires the QSFP28 host port to be configured for 4x25GbE breakout in the switch. Not compatible with InfiniBand EDR/HDR ports without protocol reconfiguration. Not for QSFP+ 40GbE or QSFP56 200GbE host ports. Fixed 3m length; non-detachable connectors.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies link bring-up on all four branches and paddle-card EEPROM integrity before shipment. Visit tes-itsolutions.com for 100GbE/25GbE fabric design consultation. Stocked in the EU with 1–3 day handling and global shipping.