Digital telecommunication system
Digital telecommunications switches network with in-built fault
Digital telecommunications switching system
Digital telecommunications system
Digital teleconferencing control device, system and method
Digital telephone apparatus
Digital telephone communication system including an exchange and
Digital telephone exchange with means for processing packet-swit
Digital telephone switch with simultaneous dual PCM format compa
Digital telephone system
Digital telephone system circuits
Digital tie line
Digital time division multiplex system and method of controlling
Digital time-division multiplex switch-based telephone subscribe
Digital time-division multiplex telecommunication system
Digital time-division switch
Digital timeslot and signaling bus in a digital PBX switch
Digital tone decoder and method of decoding tones using linear p
Digital tone generator
Digital tone signal generator for telephony system