Digital communication station signaling control
Digital communication system
Digital communication system
Digital communication system for simultaneous transmission of da
Digital communication system with intelligent channel units
Digital communication terminal equipment
Digital communications network with unlimited channel expandabil
Digital communications system utilizing controllable field size
Digital communications system with automatic frame synchronizati
Digital communications system with symbol multiplexers
Digital communications transmission system
Digital concentrator
Digital concentrator for use with a digital telephone office
Digital concentrator switch
Digital concentrator terminal synchronization
Digital conference circuit
Digital conference circuit
Digital conference circuit
Digital conference circuit and method
Digital conference time slot interchanger