公开(公告)号：US3530255A

公开(公告)日：1970-09-22

申请号：US3530255D

申请日：1967-08-17

Applicant: BELL TELEPHONE LABOR INC

Inventor： DAGNALL CLARENCE H JR ,  IRWIN GORDON C ,  KENNEDY JAMES B

IPC: H04M7/10 ,  H04Q3/54 ,  H04M7/00

CPC classification number: H04Q3/54

公开(公告)号：US3585306A

公开(公告)日：1971-06-15

申请号：US3585306D

申请日：1968-05-16

Applicant: BELL TELEPHONE LABOR INC

Inventor： BATTOCLETTI FRANK E ,  DAGNALL CLARENCE H JR ,  SHELDAHL STEPHAN A

IPC: H04J3/12 ,  H04Q3/54 ,  H04Q11/04 ,  H04J3/00

CPC classification number: H04Q11/04 ,  H04J3/12 ,  H04Q3/54

Abstract: A tandem office switching system is disclosed which will accommodate both digital and analog signals transmitted in single or multiplexed message form. A space division system switches analog signals received in serial single message form and a time division system switches digital signals received in multiplex message form. All signals received in the time division system are processed in accordance with timing derived from the incoming digital signals while signals transmitted from the time division system are processed in accordance with the tandem office timing. The system permits the switching of incoming analog signals to outgoing digital trunks and incoming digital signals to outgoing analog trunks through both space and time division systems.

公开(公告)号：US3573388A

公开(公告)日：1971-04-06

申请号：US3573388D

申请日：1969-07-07

Applicant: BELL TELEPHONE LABOR INC

Inventor： DAGNALL CLARENCE H JR

IPC: H04Q3/52 ,  H04Q3/42

CPC classification number: H04Q3/521

Abstract: An electronic crosspoint matrix is arranged to operate in parallel with or as a substitute for a crossbar switch in a common control switching system. Each electronic crosspoint, which consists of an output gate controlled by a plurality of other gates, can be operated, held and released in the same manner as a conventional metallic crosspoint. High frequency data is switched through each crosspoint in response to a marking signal received on an associated select lead followed by receipt of a marking signal on an associated hold lead. Once operated, a crosspoint remains operated under control of the associated hold lead.