公开(公告)号：US4357495A

公开(公告)日：1982-11-02

申请号：US232913

申请日：1981-02-09

申请人： Anthony W. Sweet ,  Michael P. Dyer

发明人： Anthony W. Sweet ,  Michael P. Dyer

IPC分类号： H04M19/00 ,  H04M1/76 ,  H04B3/36

CPC分类号： H04M19/008

摘要： The direct current line feed for a telephone subscriber's line is derived from a variable voltage source connected to the line. In one case, the source is series connected in one leg of the line while in the other case it is connected across the line. In the first case there is a constant current source across the line while in the second case the voltage source is a constant current device. In both cases a pair of matching resistors is connected across the line with the center tap grounded to provide a high resistance balanced termination for the line. In both cases a high impedance monitor is connected across the line to monitor the voltage conditions on the line, and this, via a control circuit controls the voltage source and the separate constant current device if provided. This enables line voltage to be adjusted to take account of line length without introducing undesirably large dissipation.

摘要翻译： 用于电话用户线路的直流线路馈送源自连接到线路的可变电压源。 在一种情况下，源串联连接在一条线上，而另一种情况下，它是跨线连接的。 在第一种情况下，在整个线路上存在恒定电流源，而在第二种情况下，电压源是恒定电流器件。 在这两种情况下，一对匹配电阻器跨越线路连接，中心抽头接地，为线路提供高电阻平衡端接。 在这两种情况下，高阻抗监控器都连接在线路上，以监控线路上的电压状况，并且通过控制电路控制电压源和单独的恒流器件（如果提供）。 这样可以调整线路电压以考虑线路长度，而不引入不期望的大耗散。

公开(公告)号：US4345115A

公开(公告)日：1982-08-17

申请号：US214326

申请日：1980-12-08

申请人： Anthony W. Sweet

发明人： Anthony W. Sweet

IPC分类号： H04Q3/42 ,  H04Q11/04 ,  H04M1/00 ,  H04B3/36

CPC分类号： H04Q11/04

摘要： A telephone subscriber's line interface for a system in which the telephone instrument and the connections therefrom to the exchange use analogue, while the exchange is digital is described, in which electro-mechanical components are eliminated.To achieve this a microprocessor serves a group of lines on a multiplexed basis, responding to conditions of the line as determined via a high impedance monitor and analogue-to-digital conversion means. It also responds to control inputs from the rest of the exchange. In response to the above inputs it controls line feed, signalling, etc. via digital-to-analogue conversion means and a line driver.

摘要翻译： 一种用于系统的电话用户线路接口，其中电话仪器及其与交换机的连接使用模拟，而交换机是数字的，其中消除了机电组件。 为了实现这一点，微处理器在多路复用的基础上对一组线路进行响应，响应于通过高阻抗监视器和模数转换装置确定的线路的条件。 它还响应来自其他交易所的控制输入。 响应于上述输入，它通过数模转换装置和线路驱动器控制换行，信令等。

公开(公告)号：US4345117A

公开(公告)日：1982-08-17

申请号：US208559

申请日：1980-11-20

申请人： Anthony W. Sweet

发明人： Anthony W. Sweet

IPC分类号： H04M7/04 ,  H04M19/00 ,  H04Q11/04 ,  H04M1/00 ,  H04B3/16

CPC分类号： H04Q11/04 ,  H04M19/008

摘要： To limit the line current dissipation in a telephone system it is considered desirable, especially in electronic systems, for the line current feed to be constant current. In the present arrangement the constant current supplied to the line is made adjustable in accordance with line conditions, especially the voltage between the line wires. A high impedance monitor is connected across the line to monitor the voltage between the two wires and to produce therefrom a reference voltage which is applied to the constant current generator so as to cause it to generate a current for line feed whose value is determined by the line voltage.

摘要翻译： 为了限制电话系统中的线路电流消耗，特别是在电子系统中，将线路电流馈送为恒定电流是合乎需要的。 在本布置中，提供给线路的恒定电流根据线路条件，特别是线路之间的电压可调。 一个高阻抗监测器连接在整个线路上，以监测两根电线之间的电压，并从中产生一个参考电压，该参考电压被施加到恒定电流发生器上，以便使其产生线性馈电电流，其值由 线电压。

公开(公告)号：US4104488A

公开(公告)日：1978-08-01

申请号：US798415

申请日：1977-05-19

申请人： Donald A. Weir ,  Anthony W. Sweet

发明人： Donald A. Weir ,  Anthony W. Sweet

IPC分类号： H04M3/22 ,  H04M19/02 ,  H04B3/46 ,  H04M3/02

CPC分类号： H04M19/026 ,  H04M3/2272

摘要： Telephone subscriber line circuits and an all-electronic telephone exchange are described wherein Hall effect devices are incorporated to detect line looping, dialing and ring-trip.

摘要翻译： 描述了电话用户线路电路和全电子电话交换机，其中并入有霍尔效应设备以检测线路环路，拨号和环路跳闸。

公开(公告)号：US4431869A

公开(公告)日：1984-02-14

申请号：US212347

申请日：1980-12-03

申请人： Anthony W. Sweet

发明人： Anthony W. Sweet

IPC分类号： H04M19/00 ,  H04M1/00 ,  H04B3/16

CPC分类号： H04M19/008

摘要： In a telephone line feeding arrangement, the line current is monitored by a multi-resistor network (R.sub.p R.sub.s) and the output of the network applied to the inputs of an operational amplifier (A3). The output of this amplifier, which is a voltage whose value depends on the line current, is compared by a comparator (A4) with a reference voltage (V.sub.R) to produce a control voltage for a variable voltage (VVS), the output of which provides line feeding voltage.In an alternative, the monitoring is effected by connecting the two line wires each via a resistor to one of the inputs of an operational amplifier (A6) whose output is a voltage dependent on line voltage. This voltage is applied to an input of another operational amplifier (A7) where it is in effect added to a reference voltage (V.sub.R). The output of this amplifier (A7) is used to control the variable voltage source (VVS), which in turn controls a constant current source (CCS) whose output provides line current.

摘要翻译： 在电话线馈送装置中，线路电流由多电阻网络（RpR）监控，并且网络的输出被施加到运算放大器（A3）的输入。 该放大器的输出，其是取决于线路电流的电压，通过比较器（A4）与参考电压（VR）进行比较，以产生可变电压（VVS）的控制电压，其输出 提供线路馈电电压。 另一方面，通过将两个线路电缆通过电阻器连接到运算放大器（A6）的输入之一来实现监视，运算放大器（A6）的输出是取决于线路电压的电压。 该电压被施加到另一运算放大器（A7）的输入端，其中它实际上被添加到参考电压（VR）。 该放大器（A7）的输出用于控制可变电压源（VVS），VVS又控制输出提供线电流的恒流源（CCS）。