DISCRETE CODE- As used in the Air Traffic Control Radar Beacon System (ATCRBS), any one of the 4096 selectable Mode 3/A aircraft transponder codes except those ending in zero zero; e.g.
When ARTS computer fails all aircraft are given the same discrete code, slashes appear instead of numbers. When a complete radar and computer failure occurs we have a reversion to CENRAP which will use a radar signal from one of centres antennae.
Air traffic control will typically assign a discrete code for each airplane, but four codes are prescribed for specific uses: 1200 indicates an airplane flying in good weather, on its own, usually without ATC involvement; ...
Transponder code. One of 4,096 four-digit discrete codes ATC assigns to distinguish between aircraft.
Trend. Immediate indication of the direction of aircraft movement, as shown on instruments.
 See also: Landing, Airport, Navigation, Aircraft, ATC
  
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