NVIDIA Mellanox MCP1OPT-NWEAU2 Passive Copper Cable, 400Gb/s, OSFP to OSFP, 1.4m, 26AWG: This enterprise networking cable is a 1.4-meter passive direct attach copper (DAC) cable with OSFP connectors on both ends, part number MCP1OPT-NWEAU2. It supports 400Gb/s throughput using PAM4 signaling at 100 Gb/s per lane across 4 lanes. The 26AWG conductor gauge provides a balance between flexibility and signal integrity for short-distance 400G connections. As a passive cable, it requires no external power and adds minimal latency. This is a refurbished unit, tested by T.E.S IT-SOLUTIONS.
Engineering Context
The MCP1OPT-NWEAU2 provides the lowest-latency, lowest-cost 400Gb/s interconnect for OSFP-equipped devices within a single rack. At 400 Gb/s aggregate throughput (4x 100 Gb/s PAM4 lanes), it delivers line-rate connectivity with sub-microsecond latency and zero power consumption. The OSFP form factor supports both NDR InfiniBand (400Gb/s) and 400GbE Ethernet, with the protocol determined by the connected devices. The 26AWG conductors provide adequate signal quality at 400Gb/s PAM4 signaling over 1.4m distance. At this length, the cable operates well within the passive copper specification for 400G.
Deployment & Use Cases
Intra-rack 400Gb/s connections between NVIDIA Quantum-2 or Spectrum-4 switches and servers with ConnectX-7 OSFP adapters. Short-distance spine-to-leaf links in high-density 400G NDR InfiniBand or 400GbE fabrics. AI training clusters running NCCL over NDR InfiniBand. Cost-effective alternative to optical transceivers for distances under 2 meters in HPC and hyperscale data centers.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP1OPT-NWEAU2
Type: Passive DAC Cable
Data Rate: 400Gb/s (4x 100Gb/s PAM4)
Connectors: OSFP to OSFP
Length: 1.4 meters
Conductor Gauge: 26AWG
Power Consumption: 0W (Passive)
Protocol: NDR InfiniBand (400Gb/s) and 400GbE Ethernet
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
OSFP Ports Only: Both ends are OSFP connectors. Not compatible with QSFP-DD, QSFP28, QSFP56, or SFP ports. OSFP and QSFP-DD are physically different form factors and are not interchangeable without adapters. Short Distance Only: 1.4m is the cable length. For 400Gb/s connections beyond approximately 2 meters, active optical cables or transceivers with fiber are required. Passive Copper: Signal quality degrades with distance at 400Gb/s PAM4. 1.4m is within the passive copper specification. Dual Protocol: Supports both NDR InfiniBand and 400GbE Ethernet — protocol determined by connected devices, not the cable.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every 400G DAC cable for signal integrity, connector condition, and insertion loss before shipment. We stock a range of OSFP cables and provide expert guidance on 400G fabric cabling. Global shipping with 1–3 business day handling and full tracking.