公开(公告)号：US3649761A

公开(公告)日：1972-03-14

申请号：US3649761D

申请日：1970-01-23

Applicant: BELL TELEPHONE LABOR INC

Inventor： BUSH STANLEY E ,  OLSON DAVID T ,  SALTUS GEORGE E

IPC: H04M9/00 ,  H04N7/14 ,  H04N7/15 ,  H04Q3/00 ,  H04M11/00

CPC classification number: H04N7/141 ,  H04M9/002 ,  H04N7/15 ,  H04Q3/0016

Abstract: A key telephone system is arranged with a selective intercommunication link to provide wideband service between any two stations served by the system. A station lockout circuit controls access to the link to insure that only two stations, calling station and a called station, may be connected to the link at one time. A selector circuit operates in conjunction with the lockout circuit to match the transmit-receive lead pairs of a called station with the proper lead pairs of the calling station. The system is arranged such that a three-party wideband conference may be established between a line, a first station and a second station connected to the first station via the link. All the parties to the conference are connected together for continuous audio transmission while wideband transmission is maintained only between two of the parties under selective control of the first station.

Abstract translation: 一个关键的电话系统被配置有选择性的通信链路，以在系统服务的任何两个站之间提供宽带业务。 站锁定电路控制对链路的访问，以确保只有两个站，呼叫站和被叫站可以一次连接到链路。 选择器电路与锁定电路一起工作，以将被叫站的发送接收引线对与呼叫站的正确引线对匹配。 该系统被布置成使得可以经由链路在线，第一站和连接到第一站的第二站之间建立三方宽带会议。 会议的所有各方连接在一起，用于连续音频传输，而宽带传输仅在第一台选择性控制下的两方之间保持。