Abstract: In a cordless key telephone system, access units are located in groups corresponding to service areas for broadcasting radio signals on a control channel or on an assigned speech channel to cordless stations. A main controller selects one of the access units for each service area in response to an incoming call from the switched telephone network and sends a first alert signal to the selected access units to cause them to broadcast a recurrent sequence of second alert signals containing the identifiers of standby cordless stations. The second alert signal is received by each standby cordless station and an ACK signal is transmitted if the received signal contains its identifier. The ACK signal is copied by each access unit for transmission to the main controller, whereupon it returns a proceed-to-assign signal if the number of the received copies of the ACK signals is equal to the number of all standby stations.

Abstract: A power supply wiring arrangement of a semiconductor integrated circuit formed on a semiconductor chip, including a plurality of pairs of metal bumps formed on the semiconductor chip, a plurality of conductor strips each extending between the bumps forming each of the pairs of metal bumps, and a plurality of thick-layer wiring strips directly connected to selected ones of the metal bumps and the conductor strips, the thick-layer wiring strips being substantially identical in material and in thickness to the metal bumps.

Abstract: A gate array integrated circuit includes four internal logic circuits each composed of a current mode logic circuit and an emitter follower circuit having an input connected to an output of the current mode logic circuit. One wired logic circuit is formed by interconnecting output terminals of four emitter follower circuits. An one end of an interconnection wiring conductor for interconnecting the output terminals of the four emitter follower circuits is connected to an output terminal of a first emitter follower circuit, and the other end of the interconnection wiring conductor is connected to an output terminal of fourth emitter follower circuit of the N emitter follower circuits.