What causes intermittent flaps on AOCs?

• A. Inserting cables backward.
• B. Using Velcro instead of zip ties.
• C. Color-coding mismatches.
• D. Excessive tension, sharp bends, thermal stress, or failing transceiver electronics.

Answer: (D)

Intermittent flaps on AOCs are caused by physical and electrical stress on the optical link. Excessive tension, sharp bends, thermal stress, or a failing transceiver electronics can disrupt the optical signal and cause the link to go up and down. Fiber inside the AOC is sensitive to tight bend radii and pulling forces; these induce micro-bends or misalignment, weakening or breaking the connection intermittently. Temperature changes can cause components to expand or contract, shifting alignment, and a failing transceiver can produce unstable output. Together, these stressors explain the flaky behavior you’re seeing.

Routing choices like inserting cables backward, using Velcro instead of zip ties, or color-coding mismatches don’t directly cause the link to flap; they may affect identification or physical organization, but the root cause of intermittent AOC flaps is the mechanical or electronic stress described above.