Digital key telephone system and extension terminal device...
Digital kick meter and graphical user interface (GUI)
Digital longitudinal balance measurement
Digital loop carrier module for proactive maintenance...
Digital measurement of amplitude and phase of a sinusoidal signa
Digital service unit
Digital signal cross-connection system
Digital signal detector and method
Digital signal processor-based telephone test set analyzing...
Digital subscriber line access and network testing multiplexer
Digital subscriber line access and network testing multiplexer
Digital subscriber line diagnostic system
Digital subscriber line diagnostic system
Digital telephone link margin verification
Digital telephone overcoming international incompatibilities
Digital telephone station line controller
Digital telephony card for use in an operator system
Digital tone detector
Direct access test unit for central office
Direct access test unit for central office