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.
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.