If the optical module is faulty, replace it with the spare part. An optical module is a critical component in modern optical communication systems, directly affecting transmission stability, network reliability, and operational efficiency. However, during installation and daily operation, various issues may arise. Therefore, understanding common optical module. Customers in the use of optical modules will more or less encounter a variety of failure problems, such as optical module model selection is correct, the use of jumper is correct and some common problems, customers have the ability to judge and have a clear solution, but for some of the use of. Optical modules must be handled with standardized procedures during application, as any non-compliant action may cause potential damage or permanent failure. If the optical module is installed on a GE port, run the display interfaceGigabitEthernet x/x/x command to view port information when the optical module. Optical modules (SFP, SFP+, QSFP, QSFP28, etc. ) are designed for high reliability in modern networks. Yet in real-world deployments, many data centers, ISPs, and enterprise networks still experience unexpected link failures after installation. These failures are rarely caused by “defective. Based on typical issues encountered with optical modules in daily switch applications, this document summarizes basic troubleshooting steps for resolving common faults: 1.