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公开(公告)号：US3821483A
公开(公告)日：1974-06-28
申请号：US29833772
申请日：1972-10-17
申请人： RELIABLE ELECTRIC CO
发明人： JAPENGA R
CPC分类号： H04M19/006
摘要： A telephone extender is disclosed herein which includes a pair of bidirectional current flow control circuit paths for connection into each of the pair of lines of a telephone line loop. Each of the bidirectional current flow control circuit paths includes a pair of cross couples switching transistors for providing one current path and a single transistor in series with an external power source providing the other current path. Only a single power source is connected in one or the other of the telephone lines. A high impedance cross coupling is connected between the pair of bidirectional current flow control circuit paths so that proper polarity conduction occurs in each circuit.
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公开(公告)号：US3731012A
公开(公告)日：1973-05-01
申请号：US3731012D
申请日：1971-09-30
发明人： SHAFFER W
CPC分类号： H04M19/006
摘要： A current limiting and resistance monitoring circuit provides a means for limiting the amount of current flow to a telephone connection connected thereto and for generating a control signal having a level that is a function of the resistance of the telephone connection.
摘要翻译： 电流限制和电阻监视电路提供了一种用于限制到连接到其上的电话连接的电流量的装置，并且用于产生具有作为电话连接的电阻的函数的电平的控制信号。
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公开(公告)号：US3689700A
公开(公告)日：1972-09-05
申请号：US3689700D
申请日：1970-09-21
申请人： LEAR SIEGLER INC
发明人： LENT WORTHINGTON C
CPC分类号： H04M19/006 , H04M19/02
摘要： A loop extension unit for transmission circuits for increasing the central switching office to subscriber station range. The unit provides dial pulse repeating, transmission of ringing signals from whatever source provided and other supervisory signalling. Interruption of ringing is controlled by the unit by detection of an off-hook condition at the subscriber location with the ringing circuit locked out during completion of the subscriber loop between the central office and the station. DC isolation of the unit is provided by utilizing a periodically varying signal generator and transformer coupling as part of the pulse repeating circuitry.
摘要翻译： 用于将中央交换局增加到用户站范围的传输电路的环路扩展单元。 该单元提供拨号脉冲重复，从提供的任何源传输振铃信号和其他监控信号。 通过在用户位置处检测到摘机状态来控制振铃中断，在中心局和站之间的用户环路完成期间，振铃电路被锁定。 通过利用周期性变化的信号发生器和变压器耦合作为脉冲重复电路的一部分来提供该单元的直流隔离。
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公开(公告)号：US3639696A
公开(公告)日：1972-02-01
申请号：US3639696D
申请日：1969-04-01
申请人： LORAIN PROD CORP
CPC分类号： H04M19/006
摘要： A circuit for increasing the flow of telephone line current in telephone systems which utilize reverse battery supervision and the grounding of the telephone line at the subscriber station for supervisory or control purposes. Power booster networks connected in series with respective sides of a telephone line each include a semiconductor switch for controlling the flow of current toward the subscriber station and a semiconductor switch for controlling the flow of current away from the subscriber station. A DC auxiliary source is connected in series with one switch in each power booster network. The conduction of the different switches is controlled in accordance with the voltages present in the telephone system to direct telephone line current flow through that one of the DC auxiliary sources which is in power aiding relationship to said current flow despite changes in the direction of current flow in one or both sides of the telephone line.
摘要翻译： 一种用于增加电话系统中电话线路流动的电路，其利用反向电池监视和用户站处的电话线的接地用于监控或控制目的。 与电话线的各侧串联连接的增压器网络各自包括用于控制朝向用户站的电流流动的半导体开关和用于控制远离用户站的电流流动的半导体开关。 直流辅助电源与每个增压器网络中的一个开关串联连接。 根据电话系统中存在的电压来控制不同开关的导通，以引导电话线路电流流过直流辅助电源中的一个，这些直流辅助电源与电流的电流相关联，尽管电流方向发生变化 在电话线的一侧或两侧。
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公开(公告)号：US2766326A
公开(公告)日：1956-10-09
申请号：US38600453
申请日：1953-10-14
申请人： GEN ELECTRIC CO LTD
发明人： HENRY BEESLEY JOHN
IPC分类号： H04M19/00
CPC分类号： H04M19/006
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36.发明授权公开(公告)号：US06829292B1
公开(公告)日：2004-12-07
申请号：US09476770
申请日：2000-01-03
申请人： Kishan Shenoi
发明人： Kishan Shenoi
IPC分类号： H04B336
CPC分类号： H04M19/006
摘要： Systems and methods are described for digital subscriber loop repeaters. A method of transforming a digital subscriber loop signals includes increasing a gain with a digital subscriber loop repeater including: isolating an upstream signal band by passing an upstream signal through an upstream pass filter; amplifying the isolated upstream signal with an upstream amplifier; isolating a downstream signal band by passing a downstream signal through a downstream pass filter; and amplifying the isolated downstream signal with a downstream amplifier. The systems and methods provide advantages because DSL can be provided over long loops and/or over coil loaded loops.
摘要翻译： 为数字用户环路中继器描述了系统和方法。 一种变换数字用户环路信号的方法包括：利用数字用户环路中继器增加增益，包括：通过使上行信号通过上行通过滤波器来隔离上行信号频带; 用上游放大器放大隔离的上行信号; 通过使下游信号通过下游通过滤波器来隔离下行信号频带; 并用下游放大器放大隔离的下行信号。 系统和方法提供了优点，因为DSL可以在长环路和/或线圈负载环路上提供。
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公开(公告)号：US20030108190A1
公开(公告)日：2003-06-12
申请号：US10017799
申请日：2001-12-12
发明人： Jeffrey Kaiser , Daniel Ziemba
IPC分类号： H04M001/00 , H04M009/00
CPC分类号： H04M19/006
摘要： An improved telephone customer transmission line conditioner, method of making a line conditioner, improved build-out, method of making a build-out, and improved method of conditioning a line using the line conditioner and/or the improved build-out provide improved voice-band transmission as compared to a bare twisted pair, while also allowing the transmission of high-frequency digital signals, such as ADSL signals and other signals. The apparatus and method provide a boost in the high end of the voice-band (approximately 2 kHz to 3.4 kHz) to compensate for the roll-off normally located there in a bare cable, and also provide a substantial rise in the frequency response in a frequency range used for high-frequency digital transmissions. A notch in the response between frequency bands suppresses harmonic cross talk between bands.
摘要翻译： 改进的电话客户传输线路调节器，制造线路调节器的方法，改进的构建，制造方法和使用线路调节器调节线路的改进方法和/或改进的构建提供改进的语音 带宽传输与裸双绞线相比，同时也允许传输高频数字信号，如ADSL信号和其他信号。 该装置和方法在语音频带的高端（大约2kHz至3.4kHz）中提供了一种升级，以补偿通常位于裸电缆中的滚降，并且还提供频率响应的实质性上升 用于高频数字传输的频率范围。 频带之间的响应中的缺口抑制了频带之间的谐波串扰。
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公开(公告)号：US06301358B1
公开(公告)日：2001-10-09
申请号：US09087216
申请日：1998-05-29
IPC分类号： H04M1100
CPC分类号： H04M19/005 , H04M19/006
摘要： A dual-supply line-interface circuit (100) uses a −48V power supply (VBAT1) to drive long subscriber loops (120) and uses a −28V power supply (VBAT2) to drive short subscriber loops. For intermediate-length loops, a dual-slope current-feed profile (FIG. 4) is employed to limit the line-circuit's power dissipation. The line-interface circuit operates in an apparent constant-current mode, generating about 40 mA of differential line current using the low power supply, up to a threshold line voltage of about 25V, which is equal to the low power supply voltage minus required overhead. For longer loops, the line-interface circuit switches to a second constant-current mode, generating about 22 mA of differential current using the high power supply, which maintains the loop current constant until it drops to the 48V resistive-feed value.
摘要翻译： 双电源线路接口电路（100）使用-48V电源（VBAT1）驱动长用户回路（120），并使用-28V电源（VBAT2）驱动短用户回路。 对于中等长度的环路，采用双斜率电流馈送曲线（图4）来限制线路电路的功耗。 线路接口电路以明显的恒流模式工作，使用低电源产生大约40mA的差分线路电流，直到约25V的阈值线路电压，其等于低电源电压减去所需的开销 。 对于较长的回路，线路接口电路切换到第二恒定电流模式，使用高电源产生约22 mA的差分电流，从而保持环路电流恒定，直到其下降到48V电阻馈电值。
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公开(公告)号：US4282407A
公开(公告)日：1981-08-04
申请号：US085025
申请日：1979-10-15
申请人： Kenneth E. Stiefel
发明人： Kenneth E. Stiefel
CPC分类号： H04M19/006
摘要： The disclosure shows a telephone range extender which is automatically adaptable to the length of the connected subscriber loop. A loop resistance detector within the range extender discriminates between loops within a plurality of ranges of lengths. For extremely short loops not requiring range extension, the range extender circuits are disconnected from the loop. For intermediate length loops, the gain of a bidirectional voice frequency amplifier is set at a low value to provide just sufficient gain for these loops. For longer loops, the gain of the amplifier is increased to provide sufficient amplification for the longer range. For extremely long loops, the range extender is disconnected since such loops must be served by remote amplification facilities. An automatic range extender of this type is shown connected behind the first stage of the central office switch in order to concentrate range extenders on a larger plurality of subscriber loops.
摘要翻译： 本公开示出了电话范围扩展器，其自动适应所连接的用户环路的长度。 范围扩展器内的环路电阻检测器在多个长度范围内的环路之间进行区分。 对于不需要范围扩展的极短的回路，范围扩展器电路与环路断开连接。 对于中间长度环路，双向语音放大器的增益设置为低值，以便为这些环路提供足够的增益。 对于较长的环路，放大器的增益会增加，以便为更长的范围提供足够的放大。 对于极长的回路，范围扩展器是断开的，因为这样的环路必须由远程放大设备提供。 这种类型的自动量程扩展器被示为连接在中心局交换机的第一级之后，以便将范围扩展器集中在较大的多个用户环路上。
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公开(公告)号：US4130735A
公开(公告)日：1978-12-19
申请号：US786563
申请日：1977-04-11
CPC分类号： H04M19/006
摘要： A loop extender for adding a series-aiding boost voltage to a subscriber loop of a telephone system and having a d.c. boost voltage supply, an amplifier circiit having an active device connecting the voltage supply in series with a conductor of said loop for applying to the loop a magnitude of boost voltage that is dependent upon the gain of the amplifier circuit, and a further circuit, including a feedback for the amplifier circuit, for controlling the gain of said amplifier circuit in such a way that said gain is increased to cause an increase in the applied boost voltage in response to a rise in the magnitude of the loop current to a first predetermined threshold and/or in such a way that said gain is decreased to cause a decrease in the applied boost voltage in response to a decrease in the magnitude of the loop current to a second predetermined threshold.
摘要翻译： 一个环形延长器，用于向电话系统的用户环路添加一系列辅助升压电压，并具有直流。 升压电源，放大器具有有源器件，该有源器件将电压源与所述环路的导体串联连接，以向环路施加取决于放大器电路的增益的升压电压的幅度，以及另外的电路，包括 用于放大器电路的反馈，用于以这样的方式控制所述放大器电路的增益，使得增加所述增益以响应于环路电流的幅度上升到第一预定阈值而引起施加的升压电压的增加 和/或以使得所述增益减小以响应于环路电流的幅度减小到第二预定阈值而引起所施加的升压电压降低的方式。
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