公开(公告)号：US3778554A

公开(公告)日：1973-12-11

申请号：US3778554D

申请日：1971-05-24

申请人： BELL TELEPHONE LABOR INC ,  BELL TELEPHONE LABOR INC

发明人： WEINER D

IPC分类号： H04M7/00 ,  H04Q1/28

CPC分类号： H04M7/0096

摘要： A single three-wire-port PBX intercom trunk circuit supplies battery, ringing, and supervision through a switching network from the trunk circuit to a pair of interconnected stations. The intercom trunk circuit and line circuits of the stations are arranged to provide all essential controls for the calling and called stations. Interconnections from the intercom trunk circuit to the stations are arranged so that talking current conducted to any one station is substantially independent of the loop resistance of any other station to which the one station is connected.

摘要翻译： 单线三线端口PBX对讲中继电路通过交换网络从中继电路向一对互连站提供电池，振铃和监控。 车站的对讲中继电路和线路电路被安排为呼叫和被叫站的所有基本控制。

公开(公告)号：US3723661A

公开(公告)日：1973-03-27

申请号：US3723661D

申请日：1971-04-26

申请人： BELL TELEPHONE LABOR INC

发明人： DELLECKER R ,  GREASON W ,  HAYDEN P ,  DEL RAY M ,  WEINER D

IPC分类号： H04Q3/54 ,  H04Q3/42

CPC分类号： H04Q3/54

摘要： This specification discloses a telephone system suitable for use as a private branch exchange and includes a switching network for establishing call connections between station line circuits, trunks and registers under electronic common control. Each register comprises control circuitry for switching a multifunctional counter circuit into a plurality of configurations on a single call for initially scanning stations to detect call service requests, then counting dialed pulses transmitted from a calling station, and subsequently scanning stations on a callback operation to identify the calling station.

摘要翻译： 本说明书公开了适用于专用分支交换机的电话系统，并且包括用于在电子公共控制下的站线电路，中继线和寄存器之间建立呼叫连接的交换网络。 每个寄存器包括用于在单个呼叫上将多功能计数器电路切换成多个配置的控制电路，用于初始扫描站以检测呼叫服务请求，然后计数从呼叫站发送的拨号脉冲，以及随后在回呼操作上扫描站以识别 呼叫台。