Huawei AirEngine 5760-11DH is an Optical Radio Unit (ORU) in Zero-Roaming Distributed Wi-Fi Solution and receives radio signals from a Distributed Access Point (DAP). Typically, ORUs are mounted on the ceilings of corridors in a hospital ward area and expand wireless signals to rooms through AUs, delivering wireless access services to hospital tablets, mobile ward-round, and IoT terminals. Zero-Roaming Distributed Wi-Fi Solution consists of the DAP, ORUs, and Antenna Units (AUs). ORUs must work with a DAP (AirEngine 9700D-S) and AUs, but cannot work independently.