CATV; TELEVISION TRANSMISSION; FACSIMILE TRANSMISSION; INTERNET ARCHITECTURE; ATM; ISDN; WAN; LAN; DATA TRANSMISSION; ANTENNAS, TOWERS AND PASSIVE REPEATERS; METEOR BRUST SYSTEMS; CELLULAR RADIO; LAND MOBILE COMMUNICATIONS; SATELLITE COMUNICATIONS; HF RADIO SYSTEMS; RADIO NOISE; ELECTROMAGNETIC WAVES PROPAGATION; RADIO FREQUENCY; FIBER OPTIC TRANSMISSION; OUTSIDE PLANT-METALLIC PAIR SYSTEMS; DIGITAL NETWORK; SONET AND SDH; RADIO SYSTEM PARAMETERS; NOISE MODULATION; NUMBERING,ROUTING AND NETWORKS; SWITCHING; SIGNALING; TELEPHONE TRAFFIC; TELECOMMUNICATION SYSTEMS; TELECOMMUNICATION ENGINEERING (Topical Term)