Ensure module is fully seated, check optical power levels (Tx & Rx), replace suspect patch cord. Vendor incompatibility, outdated device firmware, incorrect module type for slot. However, during installation and daily operation, various issues may arise. Therefore, understanding common optical module. Based on typical issues encountered with optical modules in daily switch applications, this document summarizes basic troubleshooting steps for resolving common faults: 1. Check compatibility between the optical module and switch Most switch brands have specific compatibility requirements. port is disconnected due to optical module faulty (0xF0060004) on port is disconnected. We can see below in config log, the port is in normal status, but the link id is down.