A switch must use optical or copper modules that have been certified for use on Huawei S switches. How Do I Query the Optical Modules Supported by Switches?Huawei Switches Must Use Huawei-certified Optical ModulesAre Optical Modules of Huawei Switches Interchangeable with Optical Modules of Other Manufacturers?What Are the Differences Between a 10GBASE-LRM Optical Module and Other Optical. The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all. 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. This section describes the differences between MMFs and SMFs. An MMF has a relatively thick fiber core and can transmit optical signals of multiple modes. Huawei is not liable for any problem caused by the use of non-certified optical or.