Public Safety

To extend indoor public safety coverage and ensure connectivity for critical communications, CSI offers a complete line of Public Safety in-building products.

System Components

CSI offers several 700 MHz compliant passive components to ensure DAS infrastructure installed today for support of PCS, Cellular, & SMR 800 Bands, will also support future LTE and AWS commercial and 700 MHz Public Safety bands.

Our History

CSI began operation in the Amoskeag Small Business Incubator located in Manchester, NH. The year was 1997 and the goal of the small staff was to provide infrastructure products for the blossoming wireless industry. An In-Line Tower Top Amplifier that increased the receive range of cell sites; and a Bi-Directional Amplifier that extends wireless coverage into facilities lacking inside coverage were CSI’s first products. Since then, CSI has sold over 32,000 in-building amplifiers and related equipment that has been installed worldwide. CSI has brought wireless service to airport terminals, sports stadiums, university campuses, hospitals, tunnels, shopping centers, underground garages and scores of other venues lacking sufficient wireless coverage.

To complement the CSI signal amplification product line, CSI developed expertise in the design and installation of in-building systems. The CSI Custom Solutions Group has now designed and installed thousands of turnkey projects and has set the standards by which competitors are measured. CSI is now the only turnkey solution provider that is approved by all of the major U.S. wireless service providers.

CSI is a privately held company that maintains headquarters in the Jefferson Mill located in the historic millyard district of Manchester, NH.

CSI is the only systems integrator that is approved to provide turnkey in-building voice and data solutions to all of the major wireless service providers on a nationwide basis:

FAQs

What frequencies do CSI Bi-Directional Amplifiers (BDAs) work on?
CSI manufactures a wide range of amplifiers covering public safety and wireless service provider frequencies for Public Safety 700, Public Safety 800, SMR800, SMR900, GSM 900, DCS 1800, UMTS 2100, Cellular and PCS bands and sub-blocks.

How do I know which CSI Bi-Directional Amplifier to use?
To determine which amplifier to use, one needs to know the frequency band, Receiver Signal Strength Indicator (RSSI) of the serving cell site and the characteristics of the facility that requires coverage.

What is a link budget?
A link budget is the calculation of signal strength on a Distributed Antenna System (DAS) at coax connection points in dBm units. Example of a downlink link budget for one indoor antenna DAS; Roof RSSI(-75dBm) + gain donor antenna (11dBm) + loss coax to BDA (3dBm) + gain BDA (62dBm) + loss coax to indoor antenna (4.5dBm) = -9.5dBm at indoor antenna port.

How much area will each antenna cover?
Antenna coverage is determined by the building characteristic path loss, frequency band(s), signal strength at antenna port and antenna type. For example, in a typical office application, an omni antenna with an output signal of +9.5dBm will maintain a coverage area of +85dBm or better for 22k square feet on the cellular frequency band, 16k square feet on the PCS frequency band.

Does CSI manufacture In-Line Boosters?
Yes. CSI manufactures In-Line Booster (ILB) and Remote Booster Units (RBU). The ILB Model 130, is used to boost signal when using long coax runs between the BDA and indoor antennas or radiating cable. An ILB is installed at the far end of the cable before the indoor antenna or splitter. The ILB gain is the adjusted to compensate for the cable loss. The RBU is a multi-band in-line amplifier housing two or more in-line amplifiers. They are most commonly used in SMR800/SMR900 and Cellular/PCS combinations.

What is BDA oscillation?
Oscillation is when the outside antenna hears the amplified signal from the indoor antenna or the indoor antenna hears the amplified signal from the outside antenna. This event is similar to microphone/speaker feedback in audio. CSI amplifiers contain circuits to limit oscillation and oscillation shut down.

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