If so, this fault is often caused by high insertion loss of the connector or the bending of the optical fiber. Macro-bend loss happens when a fiber cable is bent. There are multiple ways that optical modules fail in common ways that can interrupt network connectivity. This is typically due to one of the following failures: hardware defect, poor seating, or incompatibility. This guide will walk you through diagnosing and resolving common. This guide will equip you with a systematic approach to diagnosing and resolving the most common optical link performance issues. The device management or driver software has a bug.