NVIDIA Mellanox MCP2M50-G002E26 50GbE SFP56 PAM4 Passive Copper Cable, 2m: This is a 2-meter passive direct-attach copper (DAC) cable engineered for single-lane 50Gb/s Ethernet (50GbE) PAM4 interconnects between SFP56 ports. The cable is a fixed-length factory-terminated assembly with permanently attached SFP56 connectors. It contains no optics, retimers, or active electronics. This is a refurbished unit.
Engineering Context
The MCP2M50-G002E26 carries 50Gb/s on a single lane using PAM4 modulation (≈26.5625 GBd). Compared to NRZ 25G, PAM4 doubles per-lane throughput at the cost of tighter SNR, so cable length and AWG selection matter. Passive copper at 2m falls within the IEEE 802.3cd reach budget for SFP56 without requiring a retimer in the connector. The integrated EEPROM advertises lane count, length, and AWG class to the host. Compliant with IEEE 802.3cd 50GAUI-1 PAM4.
Deployment & Use Cases
Top-of-Rack to server NIC links in 50GbE compute racks. Storage uplinks to Spectrum-2/Spectrum-3 leaf switches. Per-port doubling of bandwidth versus 25GbE on existing one-rack-unit ToR switches. AI/ML training pods using ConnectX-6 Dx network adapters at 50GbE. Spine-leaf intra-row interconnects up to 2m.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MCP2M50-G002E26
Form Factor: SFP56 to SFP56
Data Rate: 50GbE (50Gb/s PAM4, single lane)
Cable Type: Passive Copper Direct Attach (DAC)
Length: 2m
Power: Passive (no external power required)
Standard: IEEE 802.3cd 50GAUI-1
Protocol: 50GbE Ethernet
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with NVIDIA Spectrum-2 (SN3000) and Spectrum-3 (SN4000) switches operating SFP56 ports at 50GbE PAM4, and with ConnectX-6 Dx and ConnectX-6 Lx EN adapters that support SFP56 PAM4. Requires the host port to be configured for 50GbE PAM4 (not 25GbE NRZ). Not interchangeable with SFP28 NRZ DAC cables — the modulation and signaling are different. Not a breakout cable. Length is fixed at 2m.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests every DAC for continuity, EEPROM identity, and connector condition before shipment. We provide expert consultation on 50GbE PAM4 Ethernet fabrics, global shipping, and comprehensive warranty. Standard handling time is 1–3 business days.