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AT-CV5000 Media Converter Chassis Installation Guide
3.If a fiber inspection scope is available, use the scope to inspect the connector to make sure that it is clean and to check for scratches, pits, or other problems that may affect performance.
Note
Always keep a dust cap on a fiber optic cable when it is not in use.
Warning
Do not look directly at the cable ends or inspect the cable ends with an optical lens when the cable is connected at the other end.