If the optical module is faulty, replace it with the spare part. Taking the 10G SFP+/XFP optical module as an example, when the light module light port and other devices cannot be up, it can be checked from the following five aspects: The first step is to check whether the rate of the two ports is matched with the dual -work mode -executing the "Show Interface. This type of optical module failure mainly includes port not UP, port status is UP but do not receive or send messages, port frequently up or down and CRC error. Port not UP Taking 10G SFP+/XFP optical module as. Also, the optical transceiver with digital diagnostic monitoring (DDM) can help you monitor the real-time optical power. Tip #5: How to deal with a “no light” issue? There are several reasons for “no light” issues: incompatible SFP module, incorrect connection, SFP module not powered on, or bad. This chapter describes how to configure the Optical Amplifier Module and Protection Switching Module (PSM). For. An optical module usually consists of an optical transmitting device (TOSA, including a laser), an optical receiving device (ROSA, including a photodetector), functional circuits,main control circuit board (PCBA), housing and optical (electrical) interface and other components.