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Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]
The Federal Communications Commission assigns licenses to these entities in the public safety (PP and PX) allotments of the spectrum. These include allocations in the lower portion of the VHF spectrum (around 39–45 MHz), highly susceptible to "skip" interference but still used by state highway patrols; the VHF "hi-band", from 150–160 MHz ...
In 2008, Motorola announced the first deployment of Inter RF Subsystem Interface (ISSI) gateways between live Project 25 public safety networks. [18] The ISSI standard is a non-proprietary interface that allows two or more P25-compliant trunked systems to be connected—even if they are from different vendors or operating in different frequency ...
A trunked radio system is an advanced alternative in which the channel selection process is done automatically, so as to avoid channel conflicts and maintain frequency efficiency across multiple talkgroups. This process is handled by what is essentially a central radio traffic controller, a function automatically handled by a computer system.
In telecommunications, APCO-16, (sometimes APCO Project 16 or Project 16) is a US standard for the characteristics and capabilities of public safety trunked radio systems. The standard development effort was started in the 1970s by the APCO , a trade association of mostly police and fire service providers.
Like other centralized radio systems such as trunked radio systems, issues of delay or latency and reliance on centralized infrastructure can be impediments to adoption by public safety agencies. RoIP is not a proprietary or protocol-limited construct but a basic concept that has been implemented in a number of ways.
A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").
Association of Public-Safety Communications Officials (APCO) International was founded in 1935.. APCO serves government functions that provide public safety communications services in areas of law enforcement, forestry, conservation, fire, highway maintenance, emergency rescue and medical services, emergency management, and other activities supported or endorsed by federal, state, local and ...