NVIDIA Mellanox MCP7F00-A003 Passive Copper Hybrid Splitter Cable, QSFP28 to 4xSFP28, 100GbE to 4x25GbE, 3m — Lot of 3: This is a 3-meter passive copper breakout cable that splits a single QSFP28 100GbE port into four independent 25GbE SFP28 links. The MCP7F00-A003 is a fixed integrated assembly with one QSFP28 head and four SFP28 heads, not a transceiver pair with patch cords. The lot includes 3 refurbished cables, each tested by T.E.S IT-SOLUTIONS.
Engineering Context
The MCP7F00-A003 lets a single 100GbE QSFP28 switch port aggregate four 25GbE server uplinks, multiplying port density at the spine without requiring an additional access tier. Passive copper signalling avoids the latency and power overhead of optical transceivers, drawing zero active power. The 28 AWG conductors keep the assembly thin enough for high-density patch panels. Reach is bounded by passive copper insertion loss budgets at 25Gb/s NRZ per lane.
Deployment & Use Cases
Top-of-Rack 25GbE server fan-out from 100GbE Spectrum and Spectrum-2 switches. Connecting four ConnectX-4 Lx or ConnectX-5 Ex 25GbE NICs to a single QSFP28 uplink port. Aggregation tiers in leaf-spine fabrics where 25GbE access ports are needed but only 100GbE switch ports are available. Hyperconverged storage clusters where each node runs 25GbE.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7F00-A003
Form Factor: QSFP28 to 4x SFP28 (Hybrid Breakout)
Cable Type: Passive Copper (DAC)
Data Rate: 100GbE aggregate / 4x 25GbE NRZ per lane
Length: 3m
Conductor Gauge: 28 AWG
Power: Passive (0W)
Lot Quantity: 3 cables
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with Mellanox Spectrum (SN2000) and Spectrum-2 (SN3000) switches in 4x25G breakout mode and ConnectX-4/5/6 Lx and Ex 25GbE adapters on the SFP28 side. The QSFP28 port must be configured for breakout in switch firmware. Not compatible with QSFP+ 40GbE (4x10G) breakout — the per-lane signalling differs. Not compatible with 100G EDR InfiniBand. Not compatible with 50GbE PAM4 lanes. Fixed 3m length; one QSFP28 plus four fan-out SFP28 connectors per cable.
Why Choose T.E.S IT-SOLUTIONS
At T.E.S IT-SOLUTIONS every breakout cable is tested for per-lane continuity, EEPROM compliance, and connector seating before shipment. We provide expert consultation on Spectrum-class fabric breakout planning, global shipping with 1–3 day handling, and full after-sale support across the lot.