Digital Optical Monitoring (DOM) technology, a key feature of SFP optical modules, provides real-time, comprehensive parameter support for optical link diagnostics, making it indispensable for troubleshooting. Optical link diagnostics are central to network maintenance, and DOM technology enables. DDM or Digital Diagnostic Monitoring is a management technology which allows operators to monitor several parameters of a fibre optic transceiver, such as optical input/output levels, temperature, laser bias current and supply voltage. All of these parameters can be monitored in real-time. Defined primarily by SFF-8472, SFP DOM transforms optical modules.