公开(公告)号：US3697701A

公开(公告)日：1972-10-10

申请号：US3697701D

申请日：1970-12-21

申请人： BELL TELEPHONE LABOR INC

发明人： GREASON WILLIAM WALLACE ,  WEINER DAVID WILLIAM

IPC分类号： H04Q3/54 ,  H04Q3/22

CPC分类号： H04Q3/54

摘要： A telephone system suitable for use as a private branch exchange with 40 lines or less comprises a switching network that establishes call connections for station line circuits, registers and trunks under common control. Each line circuit comprises amplifier and gate control facilities which cooperate in the control of the switching network. The gate facilities include an address gate and a zener diode controlled gate which initially are scanned for detecting a service request and are rescanned on a callback operation to identify the calling line following a dialing operation.

公开(公告)号：US3697700A

公开(公告)日：1972-10-10

申请号：US3697700D

申请日：1970-12-21

申请人： BELL TELEPHONE LABOR INC

发明人： GREASON WILLIAM WALLACE ,  WEINER DAVID WILLIAM

IPC分类号： H04Q3/54 ,  H04Q3/22

CPC分类号： H04Q3/54

摘要： A telephone system suitable for use as a private branch exchange with 40 station and attendant lines or less is disclosed. It comprises a crossbar switching network that establishes call connections for station lines, registers and trunks under common control. PBX line hunting circuitry is integrated into the electromechanical switching network with electronic hunting gate arrangements in a group of station line circuits.