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  2. Emergency communication system - Wikipedia

    en.wikipedia.org/wiki/Emergency_Communication_System

    An emergency communication system (ECS) is any system (typically computer-based) that is organized for the primary purpose of supporting one-way and two-way communication of emergency information between both individuals and groups of individuals. These systems are commonly designed to convey information over multiple types of devices, from ...

  3. Radiotelephony procedure - Wikipedia

    en.wikipedia.org/wiki/Radiotelephony_procedure

    Radiotelephony procedure (also on-air protocol and voice procedure) includes various techniques used to clarify, simplify and standardize spoken communications over two-way radios, in use by the armed forces, in civil aviation, police and fire dispatching systems, citizens' band radio (CB), and amateur radio.

  4. Project 25 - Wikipedia

    en.wikipedia.org/wiki/Project_25

    Recognizing and understanding this need, Project 25 (P25) was initiated collaboratively by public safety agencies and manufacturers to address the issue with emergency communication systems. P25 is a collaborative project to ensure that two-way radios are interoperable. The goal of P25 is to enable public safety responders to communicate with ...

  5. Police radio - Wikipedia

    en.wikipedia.org/wiki/Police_radio

    The first two-way police radio system was implemented by the Bayonne, New Jersey police in 1933. [ 4 ] [ 5 ] The FCC briefly prohibited police radio communications in 1934, but rescinded their decision in 1935.

  6. Emergency notification system - Wikipedia

    en.wikipedia.org/wiki/Emergency_notification_system

    An emergency notification system is a method of facilitating the one-way dissemination or broadcast of messages to one or many groups of people, alerting them to a pending or existing emergency. [1] The Emergency Notification System (ENS) was created by Dialogic Communication Corporation (DCC) in the early 1980s.

  7. Two-way radio - Wikipedia

    en.wikipedia.org/wiki/Two-way_radio

    Naval air traffic controller communicates with aircraft over a two-way radio headset A variety of portable handheld two-way radios for private use. A two-way radio is a radio transceiver (a radio that can both transmit and receive radio waves), which is used for bidirectional person-to-person voice communication with other users with similar radios, [1] in contrast to a broadcast receiver ...

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