1. Endface Contamination: Dust, oil, or debris on the connector end face is the most frequent cause of signal blockage. Even microscopic particles can scatter or block light, especially in high-speed or APC connections, leading to no power transmission despite a secure connection . 2. Connector Mismatch: Using a UPC connector in an APC socket (or vice versa) creates an air gap and high return loss, which can prevent light from entering the receiver properly . 3. Physical Damage: Over-bending, kinks, or internal fiber breaks near the connector boot can permanently disrupt the optical path. These issues are often invisible externally and may be misdiagnosed as equipment failure . 4. Low-Quality or Worn Connectors: Repeated plugging and unplugging can wear down connectors, reducing signal quality. Cheap or uncertified patch cords may degrade faster over time .
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