Run the following command to view device board information and identification details of all optical modules: show inventory The output includes the module type, serial number, Cisco-compatible part number, and other details, which are retrieved from the pre-programmed. Run the following command to view device board information and identification details of all optical modules: show inventory The output includes the module type, serial number, Cisco-compatible part number, and other details, which are retrieved from the pre-programmed. Allows access to optical transceivers' register pages (memory map) to Read their status and Write (program) their configurations. Often referred as I²C, I2C, IIC (Inter-Integrated Circuit), MDIO (Management Data Input/Output) or CMIS (Common Management Interface Specification), these serial bus. 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. It is supported by a set of supplements (IA's) for specific applications. Coherent-CMIS: Provides extensions to CMIS to manage modules with coherent interfaces. These standardized communication methods create a new layer of functionality, but are. Both refer to functions for real-time monitoring of various parameters of optical transceiver such as temperature, voltage, and optical power.