communications 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 Morsecode 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.