Identity & Definition
This passive copper fanout breakout cable, the NVIDIA Mellanox MCP7Y40-N003 (NVIDIA P/N 980-9I75R-00N003), converts a single 800 Gb/s OSFP InfiniBand NDR switch port into four independent 200 Gb/s QSFP112 NDR200 downlinks over a 3-meter LSZH assembly. It is a 1-to-4 hydra-style fanout DAC (direct attach cable), not a trunk cable or an aggregation uplink. The MCP7Y40-N003 operates exclusively in InfiniBand NDR/NDR200 mode and does not support Ethernet. NDR200 (QSFP112, 2x100G PAM4 lanes) is electrically incompatible with HDR 200G (QSFP56, 4x50G NRZ lanes) despite the shared "200G" headline speed. This is a refurbished unit, tested and verified by T.E.S IT-SOLUTIONS.
Engineering Context
The OSFP 800G NDR interface carries 8x100 Gb/s PAM4 lanes. The MCP7Y40-N003 splits these into four groups of 2x100G, delivering 200 Gb/s per QSFP112 leg with perfect lane symmetry. As a passive copper cable with LSZH (Low Smoke Zero Halogen) jacket, it introduces sub-microsecond latency and draws zero power. At 3 meters this cable operates at the upper physical limit of passive copper for NDR200 PAM4 signaling — proper routing with straight cable paths and strain relief at the OSFP head and Y-junction is essential. The black pulltab identifies the OSFP end.
Deployment & Use Cases
Leaf-to-compute fanout in InfiniBand NDR fabrics connecting Quantum-2 NDR switches to four ConnectX-7 compute or GPU accelerator nodes per switch port. High-density AI training clusters where a 32-port 800G switch can serve 128 NDR200 endpoints using fanout cables. Pod-scale and rack-scale NDR200 deployments in HPC environments. Cross-rack fan-out scenarios where 1–2 meter DACs are too short but active optics are not required.
Technical Specifications
Manufacturer: NVIDIA Mellanox
Part Number (MPN): MCP7Y40-N003
NVIDIA P/N: 980-9I75R-00N003
Cable Type: Passive Copper Fanout (Hydra) Breakout DAC (Twinax)
Aggregate Data Rate: 800 Gb/s
Per-Leg Rate: 200 Gb/s (2x100G PAM4)
Lane Structure: 8x100 Gb/s PAM4 total, split 4x(2x100G)
Breakout Configuration: 1x OSFP to 4x QSFP112
Length: 3 meters
Jacket: LSZH (Low Smoke Zero Halogen)
Signaling: PAM4
Power Consumption: 0 W (passive)
Pulltab Color: Black (OSFP end)
Protocol: InfiniBand NDR / NDR200
Condition: Refurbished
Compatibility & Hard Constraints
The OSFP end of the MCP7Y40-N003 connects to NVIDIA Quantum-2 NDR switches with OSFP 800G ports. The four QSFP112 ends connect to NDR200-capable endpoints such as ConnectX-7 InfiniBand adapters. This cable is NOT compatible with HDR (QSFP56) devices — NDR200 and HDR use different lane structures and connectors. It is NOT compatible with Ethernet QSFP-DD or 400GbE equipment. It does NOT support any non-InfiniBand system. 3 meters is the upper safe limit for passive NDR200 copper; for longer distances or poorly managed cable routes, active copper (ACC) or active optical cables (AOC) should be used instead. For shorter reaches, the MCP7Y40-N001 (1m) and MCP7Y40-N002 (2m) variants are available.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS electrically validates every NDR/NDR200 fanout cable for lane mapping integrity and PAM4 signal quality before shipping. Technical consultation is available for InfiniBand fabric design and radix scaling. Global shipping with 1–3 business day handling from our facility.