The AN6311 ceiling speaker is a network full-digital analog-digital conversion signal processor based on the SIP transmission protocol. It can be mounted in any place accessible to a network. Features • Supports maximum 48kHz sampling rate, 16bit digital audio stream decoding. • Built-in 2×9W digital amplifiers. • Can play background music, emergency paging, alarm signals from the system host. • Can operate as a loud ringer for PBX systems. • Local output volume and local play status can be controlled. • Provides a complete interface that complies with the IEEE 802.3af / at PoE standard and a DC15V power supply interface, with two optional power supply modes for switching. • Appealing design and easy to install.