Digital information commodities exchange
Digital information switch matrix with on-line/off-line diagnost
Digital interface between at least two subscriber line interface
Digital interface device for PCM data, in particular for digital
Digital interface of an integrated subscriber line interface cir
Digital interface system
Digital interface system for offices connected by plural digital
Digital key stystem architecture
Digital key telephone system
Digital key telephone system
Digital key telephone system
Digital key telephone system
Digital key telephone system
Digital link for telephone station sets
Digital local switching system for integrated service digital ne
Digital loop carrier system
Digital loop carrier system having multiplexed interrupt structu
Digital loop carrier system having programmable timeslot and ban
Digital loop conferencing signal correction arrangement
Digital loop switch for controlling data information having diff