The fiber optics connectors or adapters has been identified one of the major causes of fiber optics system failure or error. This is due to dust blocking the laser light or dust accumulated in the adapters.
The fiber optics connectors need to be thoroughly cleaned using alcohol isoprophyl before being connected into the system or using any other proper cleaning tool and fiber optics adapters are also occassionally need to be thoroughly cleaned using adapter cleaner sticks.
I have been in the field of fiber optics since early 1990s. I gained fiber optics skills and knowledge via my working experience as end-user, main contractor and sub-contractor and finally as an optical fiber enterpreneur.