NVIDIA Mellanox MCP1660-W02A 400GbE QSFP-DD Passive Copper DAC, 2.5m, LSZH: This is a 2.5-meter passive Direct Attach Copper (DAC) cable with QSFP-DD connectors at both ends, engineered for 400GbE Ethernet point-to-point connections. The cable is passive — there are no retimers, DSPs, or active electronics inside the connectors — and uses a Low Smoke Zero Halogen (LSZH) jacket. This is not an Active Copper Cable (ACC) and not an active optical cable (AOC). This is a new factory-sealed unit.
Engineering Context
The MCP1660-W02A operates as 8x50Gb/s PAM4 lanes for an aggregate 400GbE data rate, compliant with IEEE 802.3ck-style 400GBASE-CR8 conventions for direct-attach copper. The cable uses 26 AWG conductors and an LSZH outer jacket suitable for data centers with strict fire-safety codes. Power consumption is 0W and added latency is limited to copper-propagation delay because no active signal conditioning is performed. At 2.5m, the assembly is suitable for top-of-rack and adjacent-rack 400GbE links where passive copper still meets signal-integrity targets.
Deployment & Use Cases
Top-of-Rack switch to ConnectX-6 Dx/ConnectX-7 server adapter links over short reaches. 400GbE leaf-to-host connections inside a single rack. Spectrum-3 and Spectrum-4 Ethernet switch uplinks where 2.5m passive reach is sufficient. Cost-optimized 400GbE intra-rack cabling in AI training nodes and cloud infrastructure with LSZH jacket requirements.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number (MPN): MCP1660-W02A
NVIDIA P/N: 980-9I35T-00W02A
Form Factor: QSFP-DD to QSFP-DD
Data Rate: 400GbE (8x 50Gb/s PAM4)
Cable Type: Passive Direct Attach Copper (DAC)
Length: 2.5m
Conductor Gauge: 26 AWG
Jacket: LSZH (Low Smoke Zero Halogen)
Power Consumption: 0W
Protocol: 400GbE Ethernet
Condition: New, factory sealed
Compatibility & Constraints
Compatible with NVIDIA Spectrum-3 (SN4000) and Spectrum-4 (SN5000) Ethernet switches that expose QSFP-DD ports, and with ConnectX-6 Dx and ConnectX-7 adapters operating in 400GbE mode. Not compatible with OSFP, OSFP RHS, or QSFP56 cages. Not an InfiniBand NDR cable — for NDR use the OSFP RHS MCP4Y10 series. Forward Error Correction (RS-FEC, KP4) must be enabled on both ends per 400GBASE-CR8 specifications. Fixed 2.5m length with no breakout option.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS supplies new and refurbished NVIDIA Mellanox networking hardware globally with verified-condition stock. Visit T.E.S IT-SOLUTIONS for catalog access and technical consultation on 400GbE Ethernet fabric cabling. Handling time 1–3 business days.