If the optical power is too high, it will cause signal distortion, packet loss, and even damage to the optical module. Have you ever experienced an unexpected network outage due to the failure of an SFP/SFP+ optical transceiver? Network outages can bring your ability to communicate and work to a halt, and your IT team will likely be frantically looking for a solution. The first thing. This document is a troubleshooting and selection guide for common optical switch failures, compiled based on over 500 field cases. It systematically analyzes the causes, solutions, and preventive measures for 10 typical issues of optical switches, provides a 20-item selection checklist covering. The Problem: The fiber optic connector ferrule (the precision ceramic or metal tip) is extremely susceptible to microscopic scratches, cracks, or contamination (dust, oils, fingerprints). Test with a known-good module or patch cable. Read TX/RX power, bias current, voltage, and temperature. Most of the time they appear as inconsistent links, intermittent errors, unexplained flaps, or ports that simply refuse to come up. In multi-vendor environments, that usually means one thing: the compatibility chain is broken somewhere.