To restrict the use of third-party modules on their devices, host manufacturers usually conduct inspections on the optical modules that are connected, including but not limited to reading the optical module manufacturer name, model number, serial number, custom part of. To restrict the use of third-party modules on their devices, host manufacturers usually conduct inspections on the optical modules that are connected, including but not limited to reading the optical module manufacturer name, model number, serial number, custom part of. The verified items include optical module plug/unplug, transmit optical power, receive optical power, signal transmission quality, data reading, error tolerance, compatibility, electromagnetic compatibility (EMC), and environmental parameters. Errors in the process of compatibility code import; B, the software update of the device leads to the original unupgraded compatibility code can not work; C. Coding errors; 2、The reasons. As core components of optical communication systems, the proper installation and use of optical modules directly impacts network stability. They lack rigorous testing, increasing the risk of defects and performance inconsistencies. Are certifications required for all regions?.