NVIDIA Mellanox MCA4J80-N026 OSFP to OSFP 800G NDR Active Copper Cable, 2.6m: This is a 2.6-meter straight active copper cable for InfiniBand NDR fabrics. It connects one 800Gb/s OSFP port to another 800Gb/s OSFP port at full NDR rate. This is a 1-to-1 OSFP-to-OSFP assembly, not a splitter, not a breakout, and not a transceiver pair. This is a new unit.
Engineering Context
The MCA4J80-N026 uses port-powered active copper redriver electronics on each OSFP head to maintain clean NDR-rate eyes across 2.6 meters where passive copper has very limited reach. The NDR 800G signaling uses 8x 100G PAM4 lanes per OSFP head. The 2.6-meter length sits between intra-rack passive DACs (typically under 1.5m) and longer 4m–5m active cables, making it a common choice for adjacent rack interconnects. The cable draws power from the OSFP cage on both ends.
Deployment & Use Cases
Quantum-2 NDR switch-to-switch interconnects across adjacent racks. ConnectX-7 OSFP NIC connectivity to top-of-rack NDR switches. BlueField-3 OSFP DPU links in storage-target deployments. Mid-rack to TOR runs in dense AI training pods where 1m DAC is too short and longer optics are not needed.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCA4J80-N026
Form Factor: OSFP to OSFP (straight, 1-to-1)
Data Rate: 800Gb/s NDR
Cable Type: Active Copper Cable (ACC)
Length: 2.6m
Protocol: InfiniBand NDR
Lane Configuration: 8x 100G PAM4 per OSFP head
Power: Port-powered (active cable)
Condition: New — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Quantum-2 NDR OSFP switches (MQM9700, MQM9790), ConnectX-7 OSFP adapters, and BlueField-3 OSFP DPUs. Both ends require OSFP cages with active-cable power budget. Not compatible with HDR/EDR-only OSFP ports and not compatible with QSFP-DD or QSFP112 cages. This is a straight cable; it does not split or break out. Fixed 2.6m length. Verify the OSFP cage thermal profile (RHS finned-top vs flat-top) on both ends matches the cable connector form before installation.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests each MCA4J80-N026 for full-rate 800G NDR BER and inspects both OSFP heads for redriver integrity before shipment. Visit https://www.tes-itsolutions.com for the complete Mellanox NDR catalog. Standard order handling time is 1–3 business days.