How many DAS system exist and what it is?

DAS is simply define as Distributed Antenna System that apply in In Building Solutions or (IBS). Those were the antennas called PICO cell and PANEL were in it applies as a coverage for the mobile wireless signal inside the bldgs.

Actually, for vendor-specifics, all of them have similar terms but for today, there are only 2 types, which is: PASSIVE & ACTIVE. The HYBRID system falls under ACTIVE Configuration.

Here is the types (configurations) nowadays for IBS:

(1) PASSIVE

(2) ACTIVE

(3) LampSite -  3G+4G+WiFi (2.4/5GHz)

There are3 types of DAS. Passive DAS, Active DAS and Hybrid DAS.

A DAS system is a Distibuted Antenna system. And it is used for IBS (Inbuilding Solutions) to maintain cellular coverage inside the builing in addition to increasing the capacity of users.