§ Mode 5 – provides a cryptographically secured version of Mode S and ADS-B GPS position.
§ Mode 4 – provides a 3-pulse reply to crypto coded challenge. § Mode 3/A – provides a 4-digit octal identification code for the aircraft, assigned by the air traffic controller. (military only – set on ground for fighters, can be changed in flight by transport aircraft) § Mode 2 – provides 4-digit octal unit code. § Mode 1 – provides 2-digit 5-bit mission code.
Several different RF communication protocols have been standardized for aviation transponders:
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