Analog Communication : A system of telecommunications used to transmit information by means other than voice, e. g. , numbers, and sometimes used in telemetry
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}