Passive Intermodulation (PIM)
Interference generated by transmit signals when they encounter non-linear junctions or materials in the signal path.

Personal Communication Services (PCS)
Wireless spectrum band used to transmit data and voice services. It uses frequencies 1900 MHz.

Point of Interface (POI)
A Point of Interface (POI) in a Distributed Antenna System (DAS) is component used to connect a service provider's signal to the DAS. POI's are available with a variety of features or capabilities and usually support an RF or optical handoff between the service provider and the DAS.