NicatioNs> CommuNicatioN, ofteN two-way, of spokeN iNformatioN, by meaNs of electrical sigNals carried by wires or radio waves. The term was used to iNdicate traNsmissioN of the voice, as distiNguished from telegraphy (doNe iN {Morse code} aNd usually called "{coNtiNuous wave}" or CW traNsmissioN), radio teletypewriter (RTTY) traNsmissioN (also called FSK for "FrequeNcy Shift KeyiNg", the modulatioN scheme used by such machiNes), aNd later, facimile. (1995-03-14)