A distributed antenna principles (Das) is a principles designed to expand the coverage of typically outdoor wireless services such as cellular, private radio systems, public-safety radios, etc., but can also be used for indoor wireless, such as wireless Lans. The penetration of these services into structure varies with their frequency and power, but it is generally difficult for an outdoor signal to cover a large space inside a building well. A distributed antenna principles can function as a repeater, or it can be used to furnish perfect infrastructure for the wireless services.
A distributed antenna principles is a associated network of antenna sites called nodes that furnish wireless aid within a geographic area or structure. The private antennas are typically mounted on top of light or utility poles, in secured cabinets, or in ceilings.
Since Das originated within the cellular industry, it should come as no surprise this is also where they are currently most effective. The current common use for a distributed antenna principles is for extending coverage in the cellular manufactures for both voice coverage and data coverage. Other applications are on the horizon for these systems such as building management, power management, bodily and other security, and, even provisioning Wlans are just a few examples of this growing market.
In some areas, the use of a distributed antenna principles just makes sense. For example, in the health care industry, areas such as operating rooms have to remain sterile, so maintenance to tool in the rooms or installation of new tool can cause harmful disruptions. Das should be installed whether when the hospital is built or is under renovation. The same can be said for lab areas, where precision measurements and testing requires a clean room.
Another use for a distributed antenna principles would be in a high safety area with restricted access. Typically, encryption and authentication methods in these areas are beyond Aes and 802.1X, such as Fips 140-2 and the encryption standards for classified communications are also in place. Das can work in these areas carrying Wlan traffic for only authorized personnel.
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