Public Safety Systems

Public Safety Systems





Public Safety Systems

Digitechx provides turnkey public safety and first responder systems for the enterprise customer. We design, engineer, and integrate BDA systems for hotels, malls, hospitals, commercial buildings, manufacturing facilities and public venues.

It is imperative that property owners of all types are required to have public safety systems to ensure in-building coverage for first responders. If the building does not inherently support local law enforcement and fire frequencies, then an in-building repeater or BDA system is required. Many states and municipalities have passed ordinances requiring new buildings to have systems to propagate their signal in building, with fire rated solutions, in order to get a certificate of occupancy.  A Public Safety DAS system is a RF based wireless communications system used by first responders such as police, fire, emergency services, disaster response agencies and homeland security. These systems are either analogue or digital, and operate on frequencies allocated by the FCC for communication between fixed base stations and mobile transceivers. The VHF and UHF elements of the spectrum, (45MHz, 150MHz, 220MHz, 400MHz, 500MHz) are analog radio systems and were primarily designed for voice communications. Some new Public Safety frequencies utilize digital technology and operate in bands like 700Mhz or 800Mhz.

First responders require seamless communication to carry out their mission, including but not limited to in-building coverage. Bi-Directional Amplifiers (BDA) are utilized to propagate coverage within a structure that due to construction densities, may block RF signal. A Public Safety DAS is a distributed antenna system connected to a BDA to amplify a signal within the structure and allow transmit and receive signals to the base station. The internal array of antenna’s and BDA are connected to a donor antenna on the property that communicates to the transmitting base station antenna.

There are National, International and local codes that were modeled to bring standards to Public Safety Systems.  The National Fire Protection Association (NFPA) and International Code Council (ICC) have model codes issued by the National Fire Code, National Electrical Code and International Building Code, which are adopted and modified by local counties and cities. The nomenclatures of ordinances and codes vary by city; however, the common features are:

A minimum Signal limit

A minimum area of coverage

A reliability & Installation standard

A monitoring and maintenance requirement

Provisions for compliance

The Authority Having Jurisdiction (AHJ), determines the code requirements and compliance of such. In many cases the AHJ is the Fire Department, and is the authority that insures compliance to the local code which is modeled around the National Code. In some jurisdictions, all cable is required to be run in 2 hour rated conduit where another jurisdiction only requires 24-hour battery back-up to all active network elements. Because all the compliance is on the local level, there has been a slow adoption rate and enforcement program. Some authorities have been quicker to implement policies than others, however most now have some program in place that has evolved over the years since the national codes were drafted.



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