NVIDIA Mellanox MCA7J65-N004 OSFP to 2x QSFP112 800G NDR Active Copper Splitter Cable, 4m: This is a 4-meter active copper breakout cable for InfiniBand NDR fabrics. It splits one 800Gb/s OSFP switch port into two independent 400Gb/s QSFP112 connections. This is a 1-to-2 OSFP-to-2xQSFP112 splitter, not a straight OSFP-to-OSFP cable, not an OSFP-to-2xOSFP splitter, and not a passive DAC. This is a new unit.
Engineering Context
The MCA7J65-N004 carries the NVIDIA part number 980-9I81B-00N004. It uses port-powered active copper redrivers in the OSFP head to deliver clean NDR signaling across the 4-meter span where passive copper cannot reliably operate. Each QSFP112 branch carries 400Gb/s NDR using 4x 100G PAM4 lanes, and the OSFP host aggregates both branches to 800Gb/s. The 4-meter length suits intra-rack and short cross-rack runs.
Deployment & Use Cases
Quantum-2 NDR switch port fan-out to ConnectX-7 QSFP112 400Gb/s NICs in the same rack or adjacent rack. AI training cluster pods where one switch port serves two compute nodes. Top-of-Rack to mid-rack server NIC links. NDR spine-leaf topologies that need switch port density without going to optics.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCA7J65-N004
NVIDIA P/N: 980-9I81B-00N004
Form Factor: OSFP to 2x QSFP112 (1-to-2 splitter)
Aggregate Data Rate: 800Gb/s
Branch Data Rate: 2x 400Gb/s NDR
Cable Type: Active Copper Cable (ACC)
Length: 4m
Protocol: InfiniBand NDR
Condition: New — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Quantum-2 OSFP NDR switches (MQM9700, MQM9790) on the host side and ConnectX-7 QSFP112 400G NDR adapters on the branch side. Requires switch port configured for 2x400G splitter mode. QSFP112 is electrically distinct from QSFP-DD; do not insert into 400GbE QSFP-DD cages. Not compatible with HDR/EDR-only ports or with passive DAC slots that cannot supply active-cable power. Fixed 4m length; this is not a straight OSFP cable, not a 2x OSFP splitter, and not an Ethernet 400G DAC.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS validates each MCA7J65-N004 splitter for full-rate BER across both QSFP112 branches and verifies the OSFP redriver before shipment. See more Mellanox NDR cabling at https://www.tes-itsolutions.com. Standard order handling time is 1–3 business days.