Select 1. System Introduction 2. System Configuration 3. System Specification 4. Example of System Operation 1. System Introduction The system is an in-building IF distribution system designed to accommodate subscribers in shaded or blanket areas of a building. With the goal of improving the wireless environment, the system can be used to receive signals from independent repeaters or BTS, transform them, and then transmit them to anywhere in the building through coaxial cable. The long distance transmission capacity of the system allows it to be suitable for installation in large buildings. The function and application of the equipment are same as those in in-building HFC. HFC connects RAU and REAU through RF signals. The high-powered in-building IF distribution system is stable in output because it minimizes transmission cable loss by lowering bandwidth by transforming RF signals to IF signals.