Note 1: Usually, the instantaneous frequency is shifted between two discrete values termed the "mark frequency[?]" and "space frequency[?]". This is a noncoherent form of FSK.
Note 2: Coherent forms of FSK exist in which there is no phase discontinuity in the output signal. Synonyms frequency-shift modulation, frequency-shift signaling.
Source: from Federal Standard 1037C and from MIL-STD-188
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