Active DAS An active DAS converts the analog radio frequency transmissions from the signal source to a digital signal for distribution. A master unit performs this analog-to- digital conversion. The master unit may digitize the signal from a single carrier or multiple carriers. Once converted, the DAS transmits the digital signal over fiber optic or Ethernet cables to remote radio units (RRUs) tha...

A distributed antenna system, or DAS, is a network of spatially separated antenna nodes connected to a common source via a transport medium that provides wireless service within a geographic area or structure.DAS antenna elevations are generally at or below the clutter level, and node installations are compact. Adistributed antennasystem may be deployed indoors (an iDAS) or outdoors (an ...

A hybrid DAS A hybrid DAS combines characteristics of passive parts(including RF antenna, directional coupler, power divider,hybrid coupler)and active systems. The RRUs are separate from the antennas, allowing the system to use both fiber optic cable a configuration includes an RRU on each floor that converts from the digital signal to analog RF. The analog RF signal is then connected to multiple ...

A Public Safety Communications system is a wireless communications system used by first responder and emergency services personnel such as police, fire, emergency medical, homeland security, and disaster response agencies to prevent or respond to incidents or situations that pose a threat to people or property. Bands of frequencies, especially in the VHF and UHF parts of the spectrum, were allocat...

The radio heads of a distributed antenna system are essentially “dummy” radio heads: these access points don’t provide any signal processing like a small cell antenna system would. Instead, DAS radio heads relay the signal to a cellular base station located at a central hub. Once the signal is relayed to the hub, it’s processed at that central location. Base stations installed at a central hub are...

In reality, all types of RF antennas have some degree of directionality. However, there are certain antenna designs and types that are particularly directional compared to other antenna types. A Directional Antenna is useful in applications where it is desirable to receive a signal from a specific direction of origin or otherwise transmit a signal in a specific direction. The directivity of an ant...

A DAS is a network of antennas, usually in-building, that provides communications over a designated area and is different from a macro tower in that the macro is outdoor and has much higher power covering a wider area. A simple way to understand the difference between a macro tower and a DAS is to consider the difference between a fire hydrant and home faucets. The macro provides massive amounts o...