Combat-net radio
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In telecommunication, a combat-net radio (CNR) is a radio operating in a network that (a) provides a half-duplex circuit and (b) uses either a single radio frequency or a discrete set of radio frequencies when in a frequency hopping mode.
CNRs are primarily used for push-to-talk-operated radio nets for command and control of combat, combat support, and combat service support operations among military ground, sea, and air forces.
In the United States, two military standards govern the use of combat net radios and the host applications that communicate over the network - MIL STD 188-220 and MIL STD 2045-47001. In addition to IETF RFCs governing UDP, TCP, and IPv4/IPv6, all seven layers of the OSI communications architecture are addressed. MIL STD 2045-47001 covers layer 7 (application), while MIL STD 188-220 covers layers 1 through 3 (physical, data link, and network).
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This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C" (in support of MIL-STD-188).
