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1. 发明授权

US3997731A Apparatus for custom calling features in a telephone system 失效
标题翻译：用于电话系统中的定制呼叫特征的装置
公开(公告)号：US3997731A
公开(公告)日：1976-12-14
申请号：US567485
申请日：1975-04-14
申请人： Charles David Wilmot , William Lee Webb , Kervyn George Collyer
发明人： Charles David Wilmot , William Lee Webb , Kervyn George Collyer
IPC分类号： H04Q3/48 , H04M3/42
CPC分类号： H04Q3/48 , Y10S379/909
摘要： Disclosed is an arrangement of circuits for providing what is normally called Custom Calling or Special Services features such as signalling and switching for a call waiting or three-way calling. The apparatus shown may provide either feature or may provide both services by the selection and insertion of one of three available circuits. A plurality of common circuits are provided to operate with specific electronic logic circuits for call waiting, three-way calling or both. Circuits are plug-in PC boards using integrated circuit logic. Individual plug-in cards are provided--one for the call waiting feature, another for three-way calling and a third card is used to provide both features. The entire apparatus may be connected to the subscriber lines and to the central office equipment at the main distributing frame thereby requiring no internal wiring or circuit changes in the central office.
摘要翻译：公开了用于提供通常所谓的自定义呼叫或特殊服务特征的电路的布置，例如用于呼叫等待或三方通话的信令和切换。所示的装置可以提供特征或者可以通过选择和插入三个可用电路之一来提供两个服务。提供多个公共电路以与用于呼叫等待，三方通话或两者的特定电子逻辑电路一起操作。电路是使用集成电路逻辑的插入式PC板。提供个人插件卡，一个用于呼叫等待功能，另一个用于三方通话，第三个卡用于提供两个功能。整个设备可以连接到主分配框架上的用户线路和中心局设备，从而不需要中心局的内部布线或电路改变。

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