DDM is typically enabled by default, but you can verify this by checking the module's datasheet or by using the appropriate CLI command. Step 2: Discover the Optical Module To discover the optical module using SNMP, you will need to know the module's IP address or. Digital Diagnostics Monitoring (DDM), also known as Digital Optical Monitoring (DOM) or Diagnostic Monitoring Interface (DMI), is a standardized feature defined by SFF-8472 that allows network devices to monitor real-time optical transceiver parameters such as temperature, voltage, transmit power. Digital Diagnostic Monitoring (DDM), also known as Digital Optical Monitoring (DOM), is a key feature in modern optical transceivers. It allows real-time monitoring of important operational parameters, helping maintain network performance, detect faults early, and simplify troubleshooting. Below. Modern optical transceivers support standard Digital Diagnostics Monitoring (DDM) functions, which enable real-time monitoring of modules' parameters. And the DDM information of the modules is commonly read via Simple Network Management Protocol (SNMP). DDM information can be accessed using a variety of network management. Digital Diagnostic Monitoring, also known as DDM, is sometimes referred to as Digital Optical Monitoring (DOM).