NVIDIA Mellanox MCP7F00-A002 100GbE to 4x25GbE Passive Copper Hybrid Breakout Cable, QSFP28 to 4xSFP28, 2m: This is a passive copper hybrid breakout direct attach cable (DAC) for splitting a single QSFP28 100GbE port into four independent SFP28 25GbE Ethernet lanes. The cable is a fixed-length integrated assembly with permanently terminated connectors; it is not a transceiver paired with a separate patch cord and cannot be re-terminated. This is a New, factory-sealed unit.
Engineering Context
The MCP7F00-A002 uses 30 AWG copper conductors and operates entirely passively, drawing no electrical power for signal conditioning. At 2 meters it is purpose-built for in-rack and adjacent-rack fan-out of a single 100GbE switch port to four 25GbE server NIC ports, eliminating the cost and power of four discrete SFP28 transceivers plus fiber. Because it is passive, total channel insertion loss budget is governed by the host port's signal integrity and the 30 AWG construction, restricting reach to short distances. NVIDIA P/N reference: 980-9I488-00C002.
Deployment & Use Cases
Top-of-Rack 100GbE switch fan-out to four 25GbE compute or storage servers in the same rack. Dense GPU pods where a Spectrum switch port is split across four ConnectX-4 Lx or ConnectX-5 EN 25GbE adapters. Cost-optimized 25GbE server access in environments already standardized on QSFP28 100GbE aggregation. Lab and staging fixtures that need a deterministic 100→4x25 split without breakout transceiver inventory.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP7F00-A002
NVIDIA P/N: 980-9I488-00C002
Form Factor: QSFP28 to 4x SFP28 (hybrid breakout)
Cable Type: Passive Copper Direct Attach (DAC)
Aggregate Data Rate: 100GbE (4 lanes x 25Gb/s NRZ)
Per-Lane Rate: 25Gb/s SFP28
Length: 2m
Conductor Gauge: 30 AWG
Power Draw: Passive (zero)
Protocol: 100GbE Ethernet (breakout to 4x25GbE)
Condition: New — factory-sealed
Compatibility & Hard Constraints
Compatible with NVIDIA Spectrum switches (SN2000, SN3000 series) and any QSFP28 host port that explicitly supports 4x25GbE breakout mode. Compatible 25GbE endpoints include ConnectX-4 Lx, ConnectX-5 EN, and ConnectX-6 Dx EN adapters in SFP28 25GbE mode. Requires the QSFP28 switch port to be explicitly configured for breakout in the switch OS; ports left in 1x100GbE mode will not link up across the four SFP28 ends. Not for InfiniBand fabrics — this is an Ethernet-only breakout. Not compatible with 40GbE QSFP+ ports. Fixed 2m length; cannot be shortened or extended.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies every cable for connector integrity, lane continuity, and labeling before shipment. We provide expert consultation on QSFP28 breakout configuration, global shipping, and a 1–3 day handling time. View this product on tes-itsolutions.com.