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Controllers use the term "squawk" when they are assigning a transponder code, e.g., "Squawk 7421". Transponders can respond with one of several different "modes" determined by the interrogation pulse from the radar. Various modes exist from Mode 1 to 5 for military use, to Mode A, B, C and D, and Mode S for civilian use.
Mode 3/A is used to identify each aircraft in the radar's coverage area. Mode C is used to request/report an aircraft's altitude. Two other modes, mode 4 and mode S, are not considered part of the ATCRBS system, but they use the same transmit and receive hardware. Mode 4 is used by military aircraft for the Identification Friend or Foe (IFF ...
In 1981, the FAA decided to implement the Traffic Alert and Collision Avoidance System (TCAS), which was developed based on industry and agency efforts in the field of beacon-based collision avoidance systems and air-to-air discrete address communication techniques that used Mode S airborne transponder message formats.
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Driver 802.11 Bus interface Wireless Security Monitor mode Master mode Ad-Hoc mode; a b g n ac ad ax WEP WPA WPA2; acx1xx: No Yes Yes No No ? ? PCI, Mini PCI, PC card, USB: Yes No No Yes Yes ? adm8211: No Yes No No No ? ? PCI: Yes ? ? Yes No Yes carl9170: Yes Yes Yes Yes No ? ? USB: Yes Yes Yes Yes Yes Yes ath5k: Yes Yes Yes No No ? ? PCI, Mini ...
For versions of Windows prior to Windows Vista, some packet analyzer applications such as Wildpackets' OmniPeek and TamoSoft's CommView for WiFi provide their own device drivers to support monitor mode. Linux's interfaces for 802.11 drivers support monitor mode and many drivers offer that support. [3] STA drivers (Ralink, Broadcom) and every ...
NASA distinguishes between a "transceiver" and "transponder". A transceiver has an independent transmitter and receiver packaged in the same unit. In a transponder the transmit carrier frequency is derived from the received signal. The frequency linkage allows an interrogating ground station to recover the Doppler shift and thus infer range and ...
CCID (chip card interface device) protocol is a USB protocol that allows a smartcard to be connected to a computer via a card reader using a standard USB interface, without the need for each manufacturer of smartcards to provide its own reader or protocol. [1]