1. The length of the fiber patch cord is insufficient:
Fiber termination quality is based on fiber cutting. No matter patch cord polishing in factory or fusion splice on site, both need to inspect the fiber endface. Mechanical tech is not reliable just because cannot inspect fiber endface, guarantee the performance temporarily with matching glue, with the time goes and environment changes, the performance changes. Fiber endface melter tech perfect the fiber endface cutting and inspect, guarantee the performance.