In our article on AOC vs DAC, our Product Manager for Data Centre Vibin Varghese has compiled a comparison of the two data centre products, including: Power Consumption, Data Transmission Distance, Cost, Anti-electromagnestic Interface and Flexibility.

Posted by Vibin On 07 December 2023


In data centres, high speed direct attach cable (DAC) assemblies or twinax cable assemblies are employed. It offers a lower-cost, higher-density alternative cabling option for high-speed 10G-400G interconnection to fibre optic transceivers.

A direct attach cable (DAC cable) is a type of factory terminated twinax cable that connects directly into transceivers. These cables are comprised of permanent lengths of shielded copper coaxial with pluggable transceivers on either end or are available in a range of lengths for short distances of up to 15 metres.

There are two common DAC cable Types:

  • Passive DAC Cables
  • Active DAC Cables

The passive DAC cable has no electrical components and so has a low power consumption of 0.15w, however the connection distance is restricted to 7m. While active DAC cables include electrical components in the connections that can improve signal levels, they can reach higher lengths (5m or more) via copper media and provide superior transmission quality. As a result, active copper cables are somewhat more costly and use more power than direct connect passive copper cables.

Data Centre AOC vs DAC

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