Cell phone systems Signal processing 2 Standards 2 Wireless communication systems 2 Asynchronous transfer mode 1 Broadband communication systems 1 Code division multiple access 1 more ... Computer networks 1 Data transmission systems 1 Digital communications 1 Digital techniques 1 Digital telephone systems 1 Frame relay (Data transmission) 1 Mobile communication systems 1 Monitoring 1 OSI (Computer network standard) 1 Optical communications 1 Personal communication service systems 1 Radio 1 Receivers and reception 1 Telecommunications systems 1 less ...