Huawei, Microphone system, models:

OptiX OSN 2500	Quick Installation Manual Routine Maintenance
OptiX OSN 550	Configuration Manual
OptiX RTN 320F	Quick Installation Manual
OptiX RTN 600	Product Description
OptiX RTN 905	Quick Installation Manual
OptiX RTN 980	Quick Installation Manual
OptiX RTN 980L V100	Quick Installation Manual
RTN XMC ODU	Product Description