公开(公告)号：US3855420A

公开(公告)日：1974-12-17

申请号：US34499573

申请日：1973-03-26

申请人： BELL LAB INC

发明人： STEIDL R

IPC分类号： H04Q3/00 ,  H04Q3/18

CPC分类号： H04Q3/00

摘要： A supervisory circuit in a telephone switching system includes two current sensing transistors, each adapted to detect current flow in alternate directions through a subscriber''s loop serving one or more stations. The conductive or nonconductive state of the transistors in combination sequentially defines supervisory states which represent on- and off-hook indications, dialed digits, as well as party identification. The party identification is utilized to ascertain which of the plural stations served by a party line is presently instituting a call.

摘要翻译： 电话交换系统中的监控电路包括两个电流感测晶体管，每个电流检测晶体管适于通过服务于一个或多个站的用户环路来检测交替方向上的电流。 晶体管的导通或非导通状态组合顺序地定义监视状态，其表示开启和摘机指示，拨号数字以及方识别。 使用派对识别来确定由派对线路服务的多个站中的哪一个当前正在进行呼叫。

公开(公告)号：US3531724A

公开(公告)日：1970-09-29

申请号：US3531724D

申请日：1968-08-23

申请人： ELECTRA CORP

发明人： FATHAUER GEORGE H

IPC分类号： H03J7/20 ,  H03J5/24 ,  H03J7/18 ,  H03K17/00 ,  H04Q3/18

CPC分类号： H03J7/18 ,  H03J5/246

公开(公告)号：US3529092A

公开(公告)日：1970-09-15

申请号：US3529092D

申请日：1966-10-03

申请人： NORTHERN ELECTRIC CO

发明人： KENEDI ROBERT

IPC分类号： H04Q3/00 ,  H04Q3/18

CPC分类号： H04Q3/00

公开(公告)号：US5495476A

公开(公告)日：1996-02-27

申请号：US378755

申请日：1995-01-26

申请人： Manoj Kumar

发明人： Manoj Kumar

IPC分类号： H04Q3/68 ,  H04Q3/18 ,  H04Q3/32

CPC分类号： H04Q3/68

摘要： Benes networks are very effective in providing inter-processor communication in SIMD parallel machines, provided the communication patterns are compile-time determinable. These networks are ill suited when communication patterns are dynamically varying because of the long set up time requirements. The present invention is a method for handling dynamically varying communication patterns efficiently by operating the Benes network in a time division multiplexed manner, wherein during a given transmission period, the middle stage switches of the Benes network are configured as a portion of the middle stage switches of a Clos network configured to route all signals in a single period.

摘要翻译： 如果通信模式是编译时可确定的，Benes网络在SIMD并行机中提供处理器间通信非常有效。 当通信模式由于设置时间长的要求而动态变化时，这些网络不合适。 本发明是一种通过以时分复用方式操作Benes网络来有效地处理动态变化的通信模式的方法，其中在给定的传输周期期间，Benes网络的中间级交换机被配置为中间级交换机的一部分 被配置为在单个周期内路由所有信号的Clos网络。

公开(公告)号：US4178485A

公开(公告)日：1979-12-11

申请号：US906772

申请日：1978-05-17

申请人： Michael C. J. Cowpland ,  Patrick R. Beirne

发明人： Michael C. J. Cowpland ,  Patrick R. Beirne

IPC分类号： H03F3/34 ,  H03F3/45 ,  H03F3/62 ,  H04B1/58 ,  H04M3/00 ,  H04M3/02 ,  H04M19/00 ,  H04Q3/00 ,  H04Q3/42 ,  H04Q3/72 ,  H04Q3/18

CPC分类号： H04M3/005 ,  H04B1/586 ,  H04M19/005 ,  H04Q3/00

摘要： A transformerless bidirectional amplifier useful in a balanced two wire to single wire line circuit, which blocks common mode signals and allows full control of signal levels, impedances, etc. A differential amplifier circuit is connected to the balanced wires, and has its output connected through a buffer amplifier to a single unbalanced wire. A second differential amplifier has its respective input terminals connected to the input and output of the buffer amplifier. The output of the second differential amplifier is connected to one of the balanced wires, and through a resistor to one of the inputs of the first differential amplifier which is connected to the other of the two balanced wires. The value of the latter resistor is such as to apply sufficient output signal from the second differential amplifier to the first differential amplifier so as to cancel a signal from the second differential amplifier which is applied to the first differential amplifier via the first wire of the balanced pair. The second differential amplifier exhibits different gains for the respective two signals applied to its individual inputs which are from the output of the first differential amplifier, whereby they are cancelled.

摘要翻译： 一种无变压器双向放大器，用于平衡双线至单线线路电路，可阻断共模信号，并可完全控制信号电平，阻抗等。差分放大器电路连接到平衡导线，并将其输出连接到 一个缓冲放大器到单个不平衡线。 第二差分放大器的各自的输入端连接到缓冲放大器的输入和输出。 第二差分放大器的输出端连接到一条平衡导线，并通过一个电阻器连接到第一差分放大器的一个输入端，该第一差分放大器的两个平衡导线中的另一个连接。 后一电阻器的值是为了将来自第二差分放大器的足够的输出信号施加到第一差分放大器，以便消除来自第二差分放大器的信号，该信号通过平衡的第一导线施加到第一差分放大器 对。 第二差分放大器对于从其第一差分放大器的输出施加到其各个输入的相应两个信号表现出不同的增益，由此它们被取消。

公开(公告)号：US3621144A

公开(公告)日：1971-11-16

申请号：US3621144D

申请日：1970-05-13

申请人： ITT

发明人： JOVIC NIKOLA L ,  KEOUGH TIMOTHY J

IPC分类号： H04Q3/52 ,  H04Q3/18

CPC分类号： H04Q3/521

摘要： The system shown covers the portion of an electronic, endmarking switching network which responds to the condition of subscriber requesting service (off-hook condition) by connecting his line to an available link circuit. The request for service is coordinated with the marking of the output end of the matrix (link circuit end) to thereafter mark the input end of the matrix to implement the connection through the ''''self-seeking,'''' endmarked matrix.

公开(公告)号：US4322586A

公开(公告)日：1982-03-30

申请号：US206630

申请日：1980-11-13

申请人： Gordon F. Mein ,  John B. Terry

发明人： Gordon F. Mein ,  John B. Terry

IPC分类号： H04B1/58 ,  H04M19/00 ,  H04M19/06 ,  H04Q3/18

CPC分类号： H04M19/005 ,  H04B1/586

摘要： A line circuit includes a fixed resistance feed consisting of a pair of resistors connected in series with a d.c. power source and tip and ring leads of a communication line. A variable current feed includes a current sink and a current source also connected in series with the d.c. power source and the TIP and RING leads. Energizing current flow in the communication line results as the combination of currents passed by the two feeds. A control circuit determines the currents conducted by the current source and current sink and introduces variations in these currents in accordance with signals for transmission along the communication line. Differences between current flows in the variable current feed and current imbalance conditions on the communication line are accommodated by the fixed resistance feed which also determines the terminating impedance for the communication line.

摘要翻译： 线路电路包括固定电阻馈电，其由与电阻串联连接的一对电阻组成。 通信线路的电源和尖端和环形引线。 可变电流馈电包括电流吸收器和电流源，其也与直流电源串联连接。 电源和TIP和RING引线。 在通信线路中激励电流流动是由两个馈送电流的组合形成的。 控制电路确定由电流源和电流吸收器传导的电流，并根据用于沿通信线路传输的信号引入这些电流的变化。 可变电流馈电电流与电流不平衡条件之间的差异通过固定电阻馈电来实现，固定电阻馈电也决定了通信线路的终端阻抗。

公开(公告)号：US4049919A

公开(公告)日：1977-09-20

申请号：US738507

申请日：1976-11-03

申请人： John S. Young

发明人： John S. Young

IPC分类号： H04M7/00 ,  H04Q3/18

CPC分类号： H04M7/0096

摘要： A trunk circuit for interconnecting an electronic and a step-by-step electromechanical switching exchange including a sensing circuit that is transparent to the transmission and supervisory signals. The sensing circuit consists of a pair of voltage dividers composed of at least four resistors each with the midpoint of each voltage divider connected to a voltage differential detecting means. The midpoints of the voltage dividers have substantially equal voltage levels in one state of the transmission path and have a measurable voltage differential in another state of the transmission path. Under conditions where a subscriber flash signal is not to be propagated through, the voltage dividers are arranged to have their resistance decreased, simulating an off-hook condition.

摘要翻译： 用于互连电子的中继电路和包括对传输和监控信号透明的感测电路的逐步机电切换交换。 感测电路由一对分压器组成，其由至少四个电阻器组成，每个电阻器的每个分压器的中点连接到电压差分检测装置。 分压器的中点在传输路径的一个状态下具有基本相等的电压电平，并且在传输路径的另一状态中具有可测量的电压差。 在用户闪光信号不被传播的条件下，分压器被布置成具有降低的电阻，从而模拟摘机状态。

公开(公告)号：US3906165A

公开(公告)日：1975-09-16

申请号：US49163374

申请日：1974-07-25

申请人： HITACHI LTD

发明人： MORIYAMA HIROMI ,  KUWABARA MOTOSUKE ,  JIN KATSUYUKI

IPC分类号： H04Q3/72 ,  H04Q3/00 ,  H04Q3/18

CPC分类号： H04Q3/00

摘要： A line circuit provided between subscriber lines and a switching network and having a line relay and a cut-off relay therein, in which the subscriber lines are connected to the switching network through the make contacts of transfer contacts of the cut-off relay and through the make contacts of transfer contacts of the line relay.

摘要翻译： 线路电路设置在用户线路与交换网络之间并具有线路继电器和截止继电器，其中用户线路通过截止继电器的转接触点的接触连接到开关网络，并通过 线路继电器的转接触点的接触。

公开(公告)号：US3529090A

公开(公告)日：1970-09-15

申请号：US3529090D

申请日：1966-03-24

申请人： BELL TELEPHONE LABOR INC

发明人： RIDDELL GEORGE

IPC分类号： H04Q3/00 ,  H04Q3/18

CPC分类号： H04Q3/00