The Huawei OptiX OSN 9800 M12 is a high-capacity, large-scale optical transmission system used in telecommunications networks. To provide control and communication functionality, it utilizes different boards, including System Control Communication Boards. OSN 9800 includes OSN 9800 U (U16, U32, U64) , M series (M05, M12, M24), P series (P32, P32C) and OSN 9800 UPS, they have different performance and service slots capacity, this article will mainly introduce the comparison of OSN9800 M05 M12 M24. he System Control Communication Boards in the Huawei OSN 9800 M12 serve as the core control unit for the entire system. They are responsible for managing and controlling various functions and modules within the optical transmission system. The boards provide centralized control and coordination of the OptiX OSN 9800 M12 system, ensuring the proper operation and synchronization of different components such as line cards, interface boards, and service boards.