What is a key benefit of AOC for longer runs compared to DAC?

• A. EMI immunity for longer runs.
• B. Lower insertion loss.
• C. Higher power handling.
• D. Easier splicing.

Answer: (A)

The main idea is EMI immunity on longer runs. An active optical cable uses fiber to carry the data as light, so there’s no electrical signal traveling along the cable. That means external electromagnetic interference and crosstalk can’t couple into the link, preserving signal integrity over longer distances. Copper DAC systems carry electrical signals, which are vulnerable to EMI, especially as distance grows, causing degradation unless you add shielding or stricter design. While fiber can also have low attenuation, the standout advantage for long runs is that the link is basically immune to EMI. The other options aren’t the primary advantage for longer distances: insertion loss can be a factor, but EMI immunity is what mainly enables reliable performance over extended reach; power handling and splicing simplicity aren’t the defining benefits for this scenario.