This problem can be detected by checking whether the light port is on, then checking whether the light module parameters such as wavelength, speed and transmission distance match, and then checking whether the gateway is configured and whether the VLAN is the same. OptiX OSN9800 U64, Board Y2G210 at slor 1,2 with the same optical module and 17-29 slot Y1L402 having the same optical modules are having the alarm LASER_MODULE_MISMATCH 1. Log on the U2000, open the NE panel, and select the "path view" configuration: 2. No cable or optical module was detected. By default, numerous alarm messages will be generated when a non-original Huawei module is used. Taking the. Page 31 3 Installing/Routing External Fibers CAUTION If the tab of an optical module is loose, remove and re-install the optical module to prevent unstable network. Overhead cabling Underfloor cabling NOTE It is recommended that the fibers connecting the SFUs on both sides are routed through their. If a module is inserted, the device displays unsupported information and alarm information such as not supported, unknown, and No qualified. Insert a transceiver, checking whether the device status indicator is abnormal or the port is disconnected.