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1. 发明授权

US4338495A Electronic key telephone systems 失效
公开(公告)号：US4338495A
公开(公告)日：1982-07-06
申请号：US18191
申请日：1979-03-06
申请人： Alan Bloch , Frank A. Coviello , Ira Guzik , Candido Puebla
发明人： Alan Bloch , Frank A. Coviello , Ira Guzik , Candido Puebla
IPC分类号： H04M9/00 , H04Q3/545 , H04Q5/20 , H04M1/00
CPC分类号： H04M9/007 , H04Q3/545
摘要： Each of the station sets in the system generates a continuous, current-modulated digital data stream carrying information concerning the status of pushbutton-actuated switches associated with a particular service or feature. This data stream is transmitted via a phantom pair over standard four-wire cable to an associated station card in the key service unit, which receives and decodes the data, implements any service requested at the associated station set by closure of a pushbutton-actuated switch in the station set, and generates a continuous voltage-modulated digital data stream carrying instructions for the connection of the station set speakerphone to either the first or second talk path formed by the first and second conductor pairs in the standard four-wire cable, for energization of light-emitting diodes associated with the pushbutton-actuated switches in the station set, and for controlling background music transmission to the associated station set. This data stream is transmitted via the aforementioned phantom pair to the station set, which receives and decodes the data and carries out the instructions contained therein. Each station card and each station set incorporates a stored-program digital microcomputer for decoding the received data and for generating the data to be transmitted. Each station card also includes a series of crosspoints in the form of field-effect transistors, the gate electrodes of which are connected to crosspoint latches controlled by the microcomputer. Each crosspoint has an associated input terminal in a status multiplexer which receives data from the passive port to which the associated crosspoint is connected. Each crosspoint and its associated status multiplexer input terminal constitute an active port. Each station card also includes at least one passive port for hotline connection to an active port of another station card or cards, and may also include a passive port for connection to the active ports of one or more link cards. Other system component circuits are disposed on line cards having a single passive port, an internal conference card having a single passive port, a page card having multiple passive ports, a register card or cards connected to the link card or cards, and a tone generator card.

2. 发明授权

US4173714A Communication circuit with combined power feed and data transmission over a phantom channel 失效
标题翻译：通信电路，通过幻像通道组合供电和数据传输
公开(公告)号：US4173714A
公开(公告)日：1979-11-06
申请号：US803243
申请日：1977-06-03
申请人： Alan Bloch , Frank A. Coviello , Ira Guzik , Candido Puebla
发明人： Alan Bloch , Frank A. Coviello , Ira Guzik , Candido Puebla
IPC分类号： H04B3/44 , H04L5/20 , H04M9/00 , H04Q5/04 , H04Q5/18
CPC分类号： H04L5/20 , H04B3/44 , H04M9/003 , H04Q5/04
摘要： The disclosure relates to a four conductor circuit arrangement providing two communication channels between a control unit and a terminal device. Power feed and bi-directional signalling are accomplished simultaneously over the same four conductors used for the two commmunication channels without interference. The signalling from the control unit to the terminal is accomplished by means of a voltage modulator circuit in the control unit by which voltage pulses are transmitted via a phantom circuit arrangement over the four conductors to the terminal unit. The voltage pulses are sensed from the phantom circuit in a data receiver which is located at the terminal unit. Connected to the phantom circuit in the terminal unit is a voltage regulator circuit which receives power from the control unit via the four conductor phantom circuit interconnecting the control unit and the terminal. In series with the voltage regulator circuit is a constant current sink and an inductor. A current modulator circuit is provided in parallel for impressing current data pulses generated in the terminal onto the phantom circuit, which are, in turn, received by a receiver circuit in the control unit.A preferred data format is disclosed as a method for transmitting information between the control unit and the terminal.The preferred embodiment for the disclosed four conductor communication circuit and the disclosed data format is in a key telephone system in which the control unit is a station card in a key service unit and the terminal is a key telephone station set.
摘要翻译：本公开涉及在控制单元和终端设备之间提供两个通信信道的四导体电路装置。馈电和双向信令可以在两个通信通道所使用的相同的四个导体上同时完成，而无干扰。从控制单元到终端的信号通过控制单元中的电压调制器电路来实现，通过该电压调制器电路经由四个导线上的幻像电路装置将电压脉冲发送到终端单元。电压脉冲从位于终端单元的数据接收器中的虚拟电路感测到。连接到终端单元中的幻象电路是通过互连控制单元和终端的四导体幻影电路从控制单元接收电力的电压调节器电路。与稳压电路串联是一个恒定电流吸收器和一个电感器。提供并联的电流调制器电路，用于将在端子中产生的电流数据脉冲压印到虚拟电路上，而虚拟电路又由控制单元中的接收器电路接收。公开了优选的数据格式，作为在控制单元和终端之间传送信息的方法。所公开的四导体通信电路的优选实施例和所公开的数据格式在密钥电话系统中，其中控制单元是密钥服务单元中的站卡，终端是密钥电话站。

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