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Distributed Antenna Systems vary depending on the outdoor or indoor venue.
Coverage gaps in small outdoor areas may be overcome by repeating over-the-air signals from a Macro site and directing a boosted signal to the target area.
A larger geographic area, as depicted in the fiber-based distribution diagram to the left, requires a dedicated Base Transceiver Set (BTS) at a Head-End in which the Radio Frequency signals are converted to optical and distributed throughout a community or complex to small aperture RF/ Optical Nodes. These Nodes convert the optical signals to RF and transmit via low-profile antennas. Signals back to the BTS follow the reverse path over the same infrastructure.
Indoor solutions primarily consist of two approaches utilizing either an over-the-air or BTS feed.
A Passive DAS is a network in which, other than the RF feed equipment, all of the components are non-electrified devices. In a Passive DAS high-power RF signals are distributed into a coaxial cabling plant consisting of various coupling devices to either antennas or a radiating cable or both.
An Active DAS is similar to a Passive DAS; however, a very low-power signal is fed to the system and distributed via fiber optics to small low-power amplifiers strategically located throughout a facility. This methodology provides for a balanced distribution and a controlled RF environment.
Utilzing Active or Passive, the client's needs assessment drive the best approach and products for the given environment.
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