AOCs are immune to electromagnetic interference (EMI). They can run longer than copper DAC cables. The cable is lighter and thinner, which improves rack airflow. Lower. Longer-range AOCs let data centers interconnect distant racks or adjacent buildings while maintaining signal integrity. When people compare DAC vs AOC, this optical transmission capability is usually the biggest reason why AOC can. Lighter Weight and Greater Flexibility: AOCs are significantly lighter and thinner than copper cables, making cable management in dense data center environments far easier.