NVIDIA Mellanox® MCP7Y40-N01A — 800G OSFP (2×NDR) → 4× QSFP112 NDR200 Passive Copper Splitter DAC, 1.5m
Technical Identity
The NVIDIA Mellanox® MCP7Y40-N01A is a 1.5-meter Passive Copper Splitter DAC with one OSFP (Fin / integrated heat sink) connector on the switch end and four QSFP112 (Flat) connectors on the adapter end. The OSFP port carries 800Gb/s aggregate (2× NDR, i.e. 2×400Gb/s) and breaks out into 4× 200Gb/s NDR200 legs on the QSFP112 side. It is purpose-built for fan-out from NVIDIA Quantum-2 NDR switches to NDR200 endpoints (ConnectX-7 or BlueField-3). Condition: New, factory-sealed.
Specifications

Brand: NVIDIA Mellanox (LinkX)
Model / MPN: MCP7Y40-N01A
Product family: LinkX Passive Copper Splitter Cables
Product type: Passive Copper Splitter DAC (1:4 / 2:4 split)
Switch end: 1× OSFP (Fin form factor, twin-port)
Adapter end: 4× QSFP112 (Flat form factor)
Aggregate speed: 800Gb/s (2× NDR)
Per-leg speed: 200Gb/s (NDR200)
Length: 1.5m
Medium: Passive copper twinax — no signal-conditioning electronics
Primary protocol: InfiniBand NDR / NDR200
Condition: New, factory-sealed

Lane & Signal Logic

OSFP (switch end): 8 electrical lanes × 100Gb/s PAM4 = 800Gb/s aggregate, organized as 2× NDR ports.
4× QSFP112 (adapter ends): 2 lanes × 100Gb/s PAM4 each = 200Gb/s per QSFP112 leg (NDR200).
Split topology: 8-lane OSFP → 4× 2-lane QSFP112 (2:4 fan-out).
Passive: No retimers, no DSP. The host OSFP port must support 2:4 split mode and own all SerDes equalization.

What This Is NOT

NOT an active (ACC) or optical (AOC) cable. Passive copper only — short-reach intra-rack use.
NOT a 1-to-1 straight cable. It is a 2:4 splitter — one twin-port OSFP fans out to four QSFP112 legs.
NOT QSFP56 / QSFP28 compatible. Adapter ends are QSFP112 cages only.
NOT a Flat-OSFP cable. The OSFP end is Fin (integrated heat sink) — verify chassis cage orientation before ordering.
NOT shipped with adapters, switches, brackets, or transceivers.

Compatibility & Constraints

Switch end (typical): NVIDIA Quantum-2 QM9700 / QM9790 NDR switches, with the OSFP port configured for 2× NDR200 (2:4) split mode.
Adapter end (typical): NVIDIA ConnectX-7 or BlueField-3 with QSFP112 cage running at NDR200 (200Gb/s).
Reach: 1.5m — intra-rack, top-of-rack to adjacent compute / GPU nodes.
Pre-deployment: Confirm switch firmware, port split mode, and subnet-manager configuration. Verify QSFP112 cage compatibility on the adapter side.

Frequently Asked Questions (FAQ)
Q. What is the MCP7Y40-N01A?
A 1.5m NVIDIA passive copper splitter DAC with 1× OSFP (Fin) at 800Gb/s on the switch end, breaking out into 4× QSFP112 (Flat) at 200Gb/s NDR200 each.
Q. What does Fin to Flat mean on MCP7Y40-N01A?
Fin refers to the OSFP module with an integrated fin heat sink on the switch side. Flat refers to the standard flat-profile QSFP112 connectors on the adapter side. This determines physical cage and orientation compatibility.
Q. Is MCP7Y40-N01A passive or active?
Passive — no signal-conditioning electronics. The host OSFP port must support the 2:4 split mode for all four legs to come up.
Q. Which switches work with MCP7Y40-N01A?
Typical platforms include NVIDIA Quantum-2 QM9700 and QM9790 NDR switches with the OSFP port placed in 2× NDR200 / 2:4 fan-out split mode.
Q. What condition does T.E.S IT-SOLUTIONS supply?
New, factory-sealed, verified by MPN, EU stock with global B2B express shipping.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist. Every unit is identified by MPN before leaving our warehouse. EU stock, multi-currency invoicing, worldwide express shipping, and free pre-sale technical consultation. See tes-itsolutions.com.