Introduction to voice communication principles in electronics. Public and private telephone systems are described including local loops, PBX and long distance techniques. Telephone transmission, switching and signaling systems are covered as well as Cellular telephone systems are explained. T1, T3, FDM, TDM, ISDN, DSL terms are explained. Students are introduced to AM modulation techniques. Super heterodyne receiver principles are introduced. SBB radios and principles of Squelch are defined.