Find answers to the most frequently asked questions about our products and technologies.
FAQs
What are the design challenges for 400G/800G ethernet applications using Direct Attached Copper (DAC)?
- At 50Gbps/lane, passive direct-attach copper (DAC) cables barely reach 3-meters. At 100Gbps/lane, DACs may only have a 2-meter practical reach limit.
- The switch PCB consumes too much of the channel budget, which then limits the cable reach and increases cable gauge.
- DACs are rigid, heavy, and bulky, restricting airflow for system cooling and making rack servicing difficult.