Distributed Antenna System (DAS)
Definition - What does Distributed Antenna System (DAS) mean?
Techopedia explains Distributed Antenna System (DAS)
All of the antennas in a DAS are simply extenders for signal coverage and are all connected to a central controller that, in turn, is connected to a carrier's base station. The RF spectrum covered by a DAS is licensed to wireless carriers, so enterprises cannot deploy a DAS on their own and must always involve a carrier, making the deployment the most expensive phase of a DAS project.
A DAS can be either passive or active. A passive DAS simply takes wireless signals from an antenna and then runs them through "leaky" feeder cables that act as antennas all over the building; the signal leakage distributes the signals. An active DAS takes the wireless signals from an external antenna and passes them to other antennas through fiber cables while being boosted and amplified along the way.