OSN 1500 series is a new-generation optical transmission system developed by Huawei. It adopts a unified switching architecture and can function as an MPLS-based packet device or a TDM device. When working with other devices of Huawei, OSN 1500 supports various networking modes, including the pure packet mode, hybrid networking (packet + TDM) mode, and pure TDM mode, achieving optimal processing for packet services and traditional SDH services. Thus, OSN 1500 efficiently transmits voice, data, storage, and video services over the same platform.