Details the Digital Diagnostic Monitoring (DDM) technology in optical modules, focusing on its real-time monitoring of key parameters like temperature, voltage, and TX/RX power for fault alerts, and explains how to use DDM data to locate issues, enhancing network operational. Details the Digital Diagnostic Monitoring (DDM) technology in optical modules, focusing on its real-time monitoring of key parameters like temperature, voltage, and TX/RX power for fault alerts, and explains how to use DDM data to locate issues, enhancing network operational. This command displays the digital diagnostic monitoring (DMM) information about an optical module. What Is the Impact of Using Non-Huawei-Certified Switch Optical Modules? How Can I Determine Whether an Optical Module Is a Huawei-Certified Optical Module? What Can I Do If the Optical Power Is Low. Starting with Cisco NX-OS Release 10. 6(1)F, you can use versatile diagnostics monitoring (VDM) to monitor pluggable optical modules on the Cisco N9364E-SG2-Q switches. Using the Moduletek SFP-10G-LR optical module installed on a Juniper EX4550 switch as an example, we show the detailed commands to read optical module information. Most of the transceivers in use today feature the DDM function.