ISDN interface circuit and system using the same
ISDN interface trunk circuit
ISDN interface unit
ISDN interface unit
ISDN interface unit
ISDN interfacing of local area networks
ISDN interfacing of personal computers
ISDN line circuit monitor system
ISDN modem capable of self-configuring to use one of a variety o
ISDN multimedia communications system
ISDN multiprotocol communications controller
ISDN network termination unit enabling to establish data link be
ISDN plus voice multiplexer system
ISDN PRI loop detection and correction
ISDN private local switching system
ISDN remote switching unit for accommodating analog and digital
ISDN signal transmission performance monitoring
ISDN subscriber terminal control system
ISDN switching system having testing facilities
ISDN system having subscriber line multiplexer with means for es