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The following list shows specific aeronautical transponder codes, and ranges of codes, that have been used for specific purposes in various countries. Traditionally, each country has allocated transponder codes by their own scheme with little commonality across borders.
In fiber-optic communications, a transponder is the element that sends and receives the optical signal from a fiber. A transponder is typically characterized by its data rate and the maximum distance the signal can travel.
A transponder (short for transmitter-responder and sometimes abbreviated to XPDR, XPNDR, TPDR or TP) is an electronic device that produces a response when it receives a radio-frequency interrogation. Aircraft have transponders to assist in identifying them on air traffic control radar .
In its simplest form, a "Mode" or interrogation type is generally determined by pulse spacing between two or more interrogation pulses. Various modes exist from Mode 1 to 5 for military use, to Mode A, B, C and D, and Mode S for civilian use.
An equipment code describes the communication (COM), navigation (NAV), approach aids and surveillance transponder equipment on board an aircraft. These alphabetic codes are used on FAA and ICAO flight plan forms to aid Flight service station (FSS) personnel in their handling of aircraft.
List of HTTP status codes - Wikipediawikipedia.org
Electronic toll collection. E-ZPass tollbooths, like this one on the Pennsylvania Turnpike in Bensalem Township, Pennsylvania, use transponders to bill motorists. Electronic toll collection ( ETC) is a wireless system to automatically collect the usage fee or toll charged to vehicles using toll roads, HOV lanes, toll bridges, and toll tunnels. [1]
Usage. An I-Pass sticker transponder, introduced in 2024, which is permanently affixed to the vehicle's windshield (the perforations in the sticker will disable the transponder if removed), and does not require replacement for battery expiration.
On May 28, 2021, the Florida's Turnpike Enterprise announced that its SunPass facilities would begin accepting E-ZPass. In addition, E-ZPass facilities began accepting SunPass Pro transponders (but not earlier SunPass transponders such as the SunPass Portable and SunPass Mini).
Today every plane in the air is tracked by Air Traffic control towers across the US. Most planes in the US and all Commercial planes carry a device known as a transponder. The transponder acts as an identification tool for aircraft allowing ATC towers to immediately recognize the identity of each plane.
If one aircraft doesn't have a transponder, then it will not alert TCAS as there is no information being transmitted. To overcome some of these limitations, the FAA is developing a new collision avoidance logic based on dynamic programming.