Arista Networks CAB-Q-S-0.5M compatible 40GBase-CU QSFP+ to 4xSFP+ direct attach cable (Passive Copper, 0.5m). A 100% Arista Networks compatible 40GBase-CU QSFP+ to 4xSFP+ twinax direct attached cable that operates over passive copper, with a maximum reach of 0.50m (1.64ft). This Arista Networks compatible twinax cable has been programmed, uniquely serialized, and data-traffic and application tested to ensure it is 100% compliant and functional. Our direct attached cable will initialize and perform identically to Arista Networks' cable and is built to meet or exceed Arista Networks' specifications, and comply with MSA (Multi-Source Agreement) standards. The actual part shipped may have a different part number, but will be functionally identical and 100% compatible. Trade Agreements Act (TAA) versions of this part are available.