Digital Diagnostic Monitoring (DDM), also commonly termed Digital Optical Monitoring (DOM), is a standardized feature for pluggable optical transceivers that provides real-time digital telemetry of critical internal parameters — including transmit optical power (TX), receive optical. Digital Diagnostic Monitoring (DDM), also commonly termed Digital Optical Monitoring (DOM), is a standardized feature for pluggable optical transceivers that provides real-time digital telemetry of critical internal parameters — including transmit optical power (TX), receive optical. Optical modules are widely used in switches, network interface cards (NICs), routers, and other communication devices. During use, reading optical module information helps understand its real-time operating status, enabling faster troubleshooting of link abnormalities. The following uses the. Digital Diagnostic Monitoring (DDM), also known as Digital Optical Monitoring (DOM), is a key feature in modern optical transceivers. Its primary function is to achieve optoelectronic conversion by converting electrical signals into optical signals and vice versa. This capability provides real-time access to vital operating parameters within optical transceivers, allowing network operators and engineers to. With the increasing widespread use of optical modules, the rate, packaging, power consumption, and functionality of optical modules are also moving towards high speed, small size, low power and multi-function.