Interrogation sequence
In telecommunications, an interrogation sequence is a short sequence of data sent by one system in order to trigger a known response from another. An example is in radar system's identification friend or foe (IFF) signals, which send a short sequence of radio frequency pulses that trigger a known response from the aircraft's transponder, like its current altitude. Another use is with computer terminals and file transfer protocols that send out a sequence of bytes to enquire about the user's system and adjust the data it sends in response.
References
- NATO - STANAG 4193 (Technical report). NATO.
- Ranshaw, Russ (18 November 1993). The CompuServe B Plus Protocol (Technical report). CompuServe.
- DECscope Users' Manual (PDF). DEC. 1975.
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