Active (APOI) vs Passive (PPOI) Points of Interface (POI)
POI or Points of Interface are essentially the point where two different phone carriers come together. It denotes who is the responsible party and many companies rent out the space to other carriers. When the two meet, one is noted as the active point of interface or APOI and the other is the passive point of interface or PPOI.
The APOI system is essentially the one that connects DAS feeders such as small cells, radio remote heads, and off air repeaters to the DAS Optical Master Unit or OMU. With the system, up to 16 different services are able to be connected to one another on APOI shelves. Each shelf maintains 8 plug in BTSI or BTS interface modules with each one covering one band with supports for up to two ports. Services supported are duplexed and multi-configured for a range of providers and services allowing for various connections to different BTS's. Both wireless and wired configurations are available.
Passive POI systems maintain a wider band frequency support than APOIs. PPOI supports bands from 1800 MHz to 2700 MHz with low loss architecture providing maximum FT transmissions. PPOI systems tend to be compact and able to be placed in building interiors to maximize signals for cell users walking around the building. With low PIM and the latest 4.3-10 connector interface PPOI provides a customizable solution for users.
Both P-POI and A-POI are essential tools working with DAS systems. These systems through time have become stronger and better designed to allow multiple cell providers to co-exist without interfering with one another. Passive works on the low end to provide support while active maintains the dominant structure. These small devices fit easily into most DAS systems and have multiple functions to provide for use with all cell carriers on the market today.
Find out differences between active DAS vs passive DAS which are names of two quite different distributed antenna system types. Review costs and benefits analysis of both types of distributed antenna systems.