--- title: What Is a DAS (Distributed Antenna System)? description: DAS (Distributed Antenna Systems) provides signal distribution out to Antennas in the building from the Amplifier, such as the BDA for an ERCES. image: https://blog.koorsen.com/hubfs/Firefighters_Fighting_Fire.jpg --- [![Koorsen Fire & Security](https://blog.koorsen.com/hs-fs/hubfs/KoorsenFireSecurity_April2017/Images/koorsen-logo.png?width=209&height=50&name=koorsen-logo.png "Koorsen Fire & Security")](https://www.koorsen.com/) [CONTACT US](https://www.koorsen.com/contact-us/) [BILL PAY](https://www.koorsen.com/koorsen-payments/) [1.866.311.7753](tel:8663117753) - [About Us](https://www.koorsen.com/about-us/) - [History](https://www.koorsen.com/about-us/history/) - [Case Studies](https://blog.koorsen.com/case-studies) - [Koorsen Companies](https://www.koorsen.com/about-us/companies/) - [Koorsen Training Center](https://www.koorsen.com/about-us/training-center/) - [Kasey Program](https://www.koorsen.com/about-us/kasey-program/) - [Pay Bill](https://www.koorsen.com/koorsen-payments/) - [Products + Services](https://www.koorsen.com/products-services/) - [Fire Protection](https://www.koorsen.com/products-services/fire-protection/) - [Security](https://www.koorsen.com/products-services/security/) - [Communications](https://www.koorsen.com/products-services/communications/) - [Mobile Equipment Solutions](https://www.koorsen.com/products-services/mobile-equipment-solutions/) - [Additional Products + Services](https://www.koorsen.com/products-services/#additional) - [Industries](https://www.koorsen.com/industries/) - [Healthcare](https://www.koorsen.com/industries/healthcare/) - [Industrial](https://www.koorsen.com/industries/industrial/) - [Education](https://www.koorsen.com/industries/education/) - [Restaurants](https://www.koorsen.com/industries/restaurants/) - [Property Management](https://www.koorsen.com/industries/property-management/) - [Hospitality](https://www.koorsen.com/industries/hospitality/) - [Retail](https://www.koorsen.com/industries/retail/) - [Construction](https://www.koorsen.com/industries/construction/) - [Locations](https://www.koorsen.com/locations/) - [News](https://blog.koorsen.com) - [Koorsen Blog](https://blog.koorsen.com) - [Koorsen In The News](https://www.koorsen.com/in-the-news/) - [Kasey the Dog Blog](https://blog.koorsen.com/kaseys-adventures) - [Careers](https://www.koorsen.com/about-us/careers/) # What Is a DAS (Distributed Antenna System)? Posted December 06, 2022 by [Koorsen Fire & Security](https://blog.koorsen.com/author/koorsen-fire-security) ![Firefighters_Fighting_Fire](https://blog.koorsen.com/hs-fs/hubfs/Firefighters_Fighting_Fire.jpg?width=1200&height=800&name=Firefighters_Fighting_Fire.jpg) The main function of distributed antenna systems is to provide signal distribution out to Antennas in the building from the Amplifier, such as the [BDA (Bi-Directional Amplifier)](https://blog.koorsen.com/what-is-a-bda-system) for an Emergency Responder Communications Enhancement System. The [DAS](https://blog.koorsen.com/what-is-a-das-distributed-antenna-system)use RF directional couplers and Ceiling mounted antennas to distribute the signal from the BDA. There is a network of Coax Cables and Antennas extending from an Amplifier located in the portions of the building that have a poor signal from the outside world (Cellular or Public Safety Radio) or to distribute WiFi signals. Airports, hotels, schools, hospitals, apartments, high rise and industrial facilities are all examples where DAS equipment may be installed. It’s used extensively with [ERCES and BDA systems](https://www.koorsen.com/products-services/communications/emergency-response-communication-enhancement-systems/) to help emergency personnel, such as police and paramedics, maintain reliable radio communications in the event of an emergency within the building. [![Business Communication System Questions? CLICK TO CONTACT US NOW](https://no-cache.hubspot.com/cta/default/1973249/d702a757-4e97-46df-b5b0-a82d141ab39a.png)](https://cta-redirect.hubspot.com/cta/redirect/1973249/d702a757-4e97-46df-b5b0-a82d141ab39a) ## **2 Main Types of Distributed Antenna Systems** There are three types of distributed antenna systems used today. You can read a brief overview of each below. ## **Passive DAS** Passive DAS means the DAS antennas do not have voltage fed to them to amplify the signal; they simply radiate signal fed to them by the DAS Coaxial cable ## **Active DAS** Active DAS means that there are powered repeaters along the signal path to re-amplify signal power and then feed the signal through the coaxial cable to its own DAS cable and antennas. ## **Why Do Operators Rely on DAS Technology?** The DAS is a crucial part of an [Emergency Responder Communication Enhancement System](https://blog.koorsen.com/what-are-emergency-responder-communications-enhancement-systems-erces) to provide coverage to the portion of the building with poor or no outside signal. ## **Rely on Stable Connections** The fiber optic and coaxial cables used in both types of DAS systems provide reliable connectivity. This means operators can perform their tasks without worrying about lost or interrupted signals. This degree of reliability is essential, especially when it comes to dispatching emergency personnel or communicating in a critical environment like a [hospital](https://www.koorsen.com/industries/healthcare/).  ## **Share Connectivity Between Multiple Sections** Distributing DAS units throughout the building allows operators to access a live connection in any part of a large facility since they won’t have to rely on a signal traveling through concrete, steel, and other thick surfaces. Instead, cables will carry the signals between terminals. ## **Make Sure Everyone Stays Connected** As you look for DAS equipment, explore the various [Signal Enhancement systems](https://www.koorsen.com/products-services/communications/emergency-response-communication-enhancement-systems/) on the market. It can also help to talk to an expert at Koorsen. A little research will ensure you buy the system that best serves your facility’s connectivity needs. [![Emergency Notification System Questions? CLICK TO CONTACT US NOW](https://no-cache.hubspot.com/cta/default/1973249/544a14da-967f-4fdc-bbb8-db83dac9982e.png)](https://cta-redirect.hubspot.com/cta/redirect/1973249/544a14da-967f-4fdc-bbb8-db83dac9982e) - [Tweet](https://twitter.com/share) Topics: [Distributed Antenna Systems](https://blog.koorsen.com/topic/distributed-antenna-systems) ## Contact Us Now! *Disclaimer: The information in this article is for informational purposes only. It is believed to be reliable, but Koorsen Fire & Security assumes no responsibility or liability for any errors or omissions in the content of this article. It does not constitute professional advice. The user of this article or the product(s) is responsible for verifying the information's accuracy from all available sources, including the product manufacturer. The authority having jurisdiction should be contacted for code interpretations.*  ### Related posts [![Questions! 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