NVIDIA Mellanox MCP7Y00-N01A InfiniBand NDR 800Gb/s OSFP to 2× 400Gb/s OSFP Passive Copper Splitter DAC, 1.5m: This is a 1.5-meter passive copper splitter cable. One twin-port OSFP end carries 800 Gb/s NDR (2× 400 Gb/s NDR lanes) and breaks out into two single-port OSFP ends, each carrying 400 Gb/s NDR. This IS a 1-to-2 fan-out cable that consumes one twin-port OSFP on the switch and two single-port OSFP cages on the endpoints. This is NOT a straight 800G-to-800G cable (see MCP4Y10 for that), NOT an Ethernet-only cable, and NOT an active optical assembly. This is a refurbished unit, tested by T.E.S IT-SOLUTIONS.
Engineering Context
NDR uses 8 lanes of 100 Gb/s PAM4 per twin-port OSFP, aggregating to 800 Gb/s per port. This splitter routes 4 lanes (400 Gb/s NDR) to each of the two OSFP legs. Because it is passive copper, the cable draws 0 W and adds no DSP latency — important in synchronized AI training where jitter at the fabric edge directly affects collective performance. The 1.5m length is a deliberate middle-ground SKU: long enough to cover U-to-U vertical routing plus a clean horizontal bend, short enough to stay well within the passive copper budget for 800G PAM4.
Deployment & Use Cases
800G NDR leaf or spine switch port fan-out into 2× 400G NDR endpoints — typical for connecting one Quantum-2 twin-port to two ConnectX-7 NDR adapters or two NDR-class compute nodes. AI training pods where the switch is 800G and the host NICs are 400G. HPC clusters using NDR backbones with mixed 800G/400G port populations. In-rack and adjacent-rack 1.5m fan-out where 1m is too short and 2m introduces unnecessary slack.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number (MPN): MCP7Y00-N01A
Cable Type: Passive Copper Splitter DAC
Connectors: 1× OSFP (twin-port) ↔ 2× OSFP (single-port)
Protocol: InfiniBand NDR
Bandwidth: 800 Gb/s → 2× 400 Gb/s
Lane Signaling: PAM4 (100 Gb/s/lane)
Length: 1.5 m
Power Consumption: 0 W (passive)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Designed for NVIDIA Quantum-2 NDR InfiniBand switches with twin-port OSFP cages, paired with single-port OSFP NDR endpoints (e.g., ConnectX-7 400G NDR adapters or NDR-class compute nodes). The switch port MUST be configured for OSFP split / twin-port operation; default single-port 400G mode will not enable the second leg. This is primarily an InfiniBand NDR cable — Ethernet (800GbE / 400GbE) operation depends on switch firmware and port mode and should be verified. This is a splitter, not a straight cable; for 800G-to-800G straight runs, use the MCP4Y10 family. Both 400G legs should be connected to fully utilize the 800G switch port.
Frequently Asked Questions (FAQ)
Q. What is the Length of the MCP7Y00-N01A?
The length of the MCP7Y00-N01A is 1.5m.
Q. Is the MCP7Y00-N01A supplied new or refurbished, and who supplies it?
The MCP7Y00-N01A is supplied refurbished by T.E.S IT-SOLUTIONS, lab-tested before dispatch and shipped from EU stock with 1-3 business day handling. Full listing and current pricing at tes-itsolutions.com.

Why T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS verifies EEPROM identity on each leg, validates lane mapping, and runs end-to-end continuity tests on every NDR splitter DAC before shipment. Handling time is 1–3 business days, with global shipping and engineer-led NDR fabric design support.