optical module troubleshooting guide covering common faults, compatibility issues, optical link failures, ESD risks, and practical solutions. As core components of optical communication systems, the proper installation and use of optical modules directly impacts network stability. Any FortiGates using optical fiber module. Remove the SFP module from the slot. When. 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. Check the model of the faulty optical module.