Direct-Attach Copper Cable (DAC)

Direct-Attach Copper Cable (DAC) – A passive copper twinax cable with integrated connectors at each end, used as a lower-cost, short-distance alternative to optical transceivers between SFP+, SFP28, or QSFP28 ports; breakout variants split a QSFP28 port into multiple lower-rate Ethernet ports. See: At a Glance Cloud Services Switch 8000 Series, CSX4000 Series Hardware Guide