公开(公告)号：US06927954B2

公开(公告)日：2005-08-09

申请号：US10098097

申请日：2002-03-13

申请人： Ralph R. Boudreaux, Jr. ,  John S. McGary ,  Steven M. Robinson

发明人： Ralph R. Boudreaux, Jr. ,  John S. McGary ,  Steven M. Robinson

IPC分类号： H04M3/18 ,  H02H3/00

CPC分类号： H04M3/18

摘要： A ground fault current-limiting circuit for limiting telecommunication wireline voltage and ground fault current to prescribed safety parameters has a ground fault current sense resistor and associated line voltage control circuit installed in a ground-coupling link to the center tap of the output winding of a bipolar voltage converter's output transformer. The control circuit compares ground fault current of either polarity flowing through the sense resistor to a prescribed value. In response to this current limit being exceeded, the control circuit produces an output signal that causes the power source to reduce its output voltage so that the ground fault current will drop to within acceptable limits.

摘要翻译： 用于将通信电缆电压和接地故障电流限制到规定的安全参数的接地故障限流电路具有接地故障电流检测电阻器和相关的线路电压控制电路，其安装在与输出绕组的输出绕组的中心抽头的地耦合链路中 双极性电压转换器输出变压器。 控制电路将流过检测电阻器的任一极性的接地故障电流与规定值进行比较。 响应于超过该电流限制，控制电路产生使电源减小其输出电压的输出信号，使得接地故障电流将下降到可接受的限度内。

公开(公告)号：US20050162096A1

公开(公告)日：2005-07-28

申请号：US10763783

申请日：2004-01-23

申请人： Jeffrey Bertrand

发明人： Jeffrey Bertrand

IPC分类号： H05B33/08 ,  H05B37/00 ,  H05B37/02

CPC分类号： H05B33/0809

摘要： A current-regulating driver circuit for a light emitting diode (LED) maintains energization drive to and thereby illumination provided by the LED at a prescribed, substantially constant value, over a relatively wide range of input (AC or DC) voltage. First and second input nodes are coupled to a source of AC or DC voltage and to a load, powered by the source of AC or DC voltage. An input rectifying diode is coupled to the first input node. A controlled current flow element is coupled in a first current flow path between the input rectifying diode and the LED and is controllably operative to supply current for illuminating the LED. A controlled current regulation circuit that includes a sense resistor coupled in series with the LED is coupled with the controlled current flow element between the first and second nodes, and is operative to regulate current supplied over the first current flow path by the controlled current flow element to the LED, and thereby accommodate variations in the value of the source of AC or DC voltage.

摘要翻译： 用于发光二极管（LED）的电流调节驱动器电路在相对宽的输入（AC或DC）电压范围内以规定的基本恒定的值保持通电驱动，并由LED提供的照明。 第一和第二输入节点耦合到AC或DC电压源以及由AC或DC电压源供电的负载。 输入整流二极管耦合到第一输入节点。 受控电流流动元件耦合在输入整流二极管和LED之间的第一电流流动路径中，并且可控地操作以供应用于照亮LED的电流。 包括与LED串联耦合的检测电阻器的受控电流调节电路与第一和第二节点之间的受控电流流动元件耦合，并且可操作地调节由受控电流流动元件在第一电流流动路径上提供的电流 到LED，从而适应AC或DC电压源的值的变化。

公开(公告)号：US06888896B1

公开(公告)日：2005-05-03

申请号：US09527162

申请日：2000-03-17

申请人： Daniel M. Joffe ,  Richard L. Goodson ,  Curtis W. Dodd

发明人： Daniel M. Joffe ,  Richard L. Goodson ,  Curtis W. Dodd

IPC分类号： H04B3/00 ,  H04B3/30

CPC分类号： H04B3/30

摘要： A method and apparatus for reducing signal distortion in a high speed data communications system caused by a flux imbalance in a system coupling transformer. The signal distortion is monitored by a combination echo canceller circuit connected to the equipment side winding of the transformer, thereby generating an error signal. Changes in the error signal are used by a flux controller to provide a flux cancellation signal. The flux cancellation signal is added with the data signal to generate an offsetting flux signal to the transformer.

摘要翻译： 一种用于减少由系统耦合变压器中的磁通不平衡引起的高速数据通信系统中的信号失真的方法和装置。 信号失真由连接到变压器的设备侧绕组的组合回波消除电路监视，从而产生误差信号。 通量控制器使用误差信号的变化来提供磁通消除信号。 磁通消除信号加上数据信号，以产生到变压器的偏移磁通信号。

公开(公告)号：US20040001489A1

公开(公告)日：2004-01-01

申请号：US10180874

申请日：2002-06-26

申请人： ADTRAN, INC

发明人： Clarke Edgar Moore ,  Marty Lee Pannell ,  W. Stuart Venters ,  Zachrey Lee Whaley II

IPC分类号： H04L012/28

CPC分类号： H04L12/5601 ,  H04L2012/5675

摘要： A bidirectional serial TDM backplanenullUTOPIA interface contains an ATM cell boundary location and transmit flow control mechanism, to provide for the efficient capture and storage of ATM cells from a serial TDM channel. Once stored in a transmit buffer, individual ATM cells are controllably read out for application to a downstream UTOPIA interface. In the upstream direction from the UTOPIA bus toward the serial TDM backplane, ATM cells are stored in a multi-cell receive buffer, so that they may be serialized for application to the TDM backplane. In the absence of ATM data cells to transfer, unfilled timeslots are filled with idle cells to maintain the ATM bus active.

摘要翻译： 双向串行TDM背板 - UTOPIA接口包含ATM信元边界位置和发送流控制机制，以提供从串行TDM信道有效捕获和存储ATM信元。 一旦存储在发送缓冲器中，可控制地读出单个ATM信元以供应用于下游UTOPIA接口。 在从UTOPIA总线朝向串行TDM背板的上行方向上，ATM信元被存储在多小区接收缓冲器中，使得它们可以被串行化以应用于TDM背板。 在没有ATM数据信元传输的情况下，未填充的时隙充满空闲信元，以维持ATM总线的有效。

公开(公告)号：US20030235199A1

公开(公告)日：2003-12-25

申请号：US10408590

申请日：2003-04-07

申请人： ADTRAN, INC.

发明人： Phillip Stone Herron

IPC分类号： H04L012/56

CPC分类号： H04L49/3081 ,  H04L49/20 ,  H04L49/30 ,  H04L2012/5671

摘要： A mechanism for implementing a single-interrupt-based voice playout buffer transfer operation. The contents of each respective channel of a multi-channel voice playout buffer are encapsulated so as to prepend a four byte ATM header, a HEC byte, and a four byte AAL2 header to a forty-four byte voice channel field to realize a standard fifty-three byte ATM cell. Within the AAL2 header, a channel identification byte (CID) provides selective mapping to timeslots of a TDM frame, to accommodate variations among different vendor equipments. The next to last bit of the last byte of the ATM header is used as an interrupt to the network processor. Only the highest voice channel asserts this next to last bit as an interrupt bit.

公开(公告)号：US20030132669A1

公开(公告)日：2003-07-17

申请号：US10050642

申请日：2002-01-16

申请人： ADTRAN, INC.

发明人： Erik Stefan Bahl ,  John S. McGary ,  Jason P. Lyon

IPC分类号： H02J001/10

CPC分类号： H02J1/108 ,  Y10T307/549

摘要： A power supply system has redundant regulated power supplies, whose output ports are diode-ORed to an output node. One of the power supplies outputs a regulated output voltage that is sufficient to meet current demand of a load coupled to the output node. Each power supply has an associated monitoring circuit that monitors the voltage drop across its OR-ing diode. The monitoring circuit for a non-dominant power supply controls its operation so that the non-dominant supply provides a reduced current through its diode to the output node that is less than the current demand of the load, but sufficient to forward bias the diode, and thereby enable the non-dominant supply to immediately respond to a load change, such as an interruption in the operation of the dominant power supply.

摘要翻译： 电源系统具有冗余的稳压电源，其输出端口与输出节点二极管二极管。 其中一个电源输出一个稳定的输出电压，足以满足耦合到输出节点的负载的当前需求。 每个电源都有一个相关的监控电路，用于监控其二极管上的电压降。 用于非主导电源的监控电路控制其操作，使得非主要电源通过其二极管向输出节点提供小于负载的电流需求的减小的电流，但足以使二极管正向偏置， 从而使得非主导电源能够立即响应诸如主电源的操作中断的负载变化。

公开(公告)号：US20030123450A1

公开(公告)日：2003-07-03

申请号：US10040153

申请日：2002-01-02

申请人： ADTRAN, INC.

发明人： Jonathan Aaron Wright ,  Christopher A. Otto

IPC分类号： H04L012/56

CPC分类号： H04M11/062 ,  H04J3/0632 ,  H04L69/324 ,  H04L2012/5674

摘要： A byte boundary information recovery mechanism locates the first bits of respective bytes of an asynchronous transfer mode (ATM)-based serial data stream, used by a frame synchronization mechanism to delineate respective cells of the ATM stream, and thereby enables transceiver equipment to successfully receive and parse ATM traffic. The invention employs a counter offset-based scheme that generates an output signal in potential alignment with the (first bit) boundary of a byte of the data stream, in response to the contents of a counter reaching a prescribed count value. It then iteratively shifts, as necessary, the bit time at which the output signal is produced relative to the counting operation of the counter, until the output signal is aligned with the boundary of a byte of the data stream.

摘要翻译： 字节边界信息恢复机制定位由帧同步机制使用的基于异步传输模式（ATM）的串行数据流的各个字节的第一位，以描绘ATM流的各个小区，从而使得收发器设备能够成功地接收 并解析ATM流量。 本发明采用基于计数器偏移的方案，其响应于达到规定计数值的计数器的内容，产生与数据流的字节的（第一位）边界电位对准的输出信号。 然后，根据需要，迭代地相对于计数器的计数操作产生输出信号的位时间，直到输出信号与数据流的字节的边界对齐。

公开(公告)号：US20030072431A1

公开(公告)日：2003-04-17

申请号：US09981047

申请日：2001-10-16

申请人： Adtran, Inc.

发明人： Michael F. Lamy ,  Paul Graves McElroy ,  Charles A. Wilson ,  Arthur Edward Aldridge

IPC分类号： H04M003/42

CPC分类号： H04Q3/66 ,  H04Q2213/13097 ,  H04Q2213/13102 ,  H04Q2213/13202

摘要： A called telephone number substitution mechanism is incorporated into the call-routing software employed by the microcontroller of a customer premises-installed communication device, through which digitized voice and data services are supplied to a customer site. The number substitution mechanism automatically selectively modifies digits of an original (dialed) telephone number, as necessary, to conform with the connectivity requirements of the communication link serving the destination device, thereby enabling the call to reach the destination device.

摘要翻译： 所谓的电话号码替代机制被并入到由客户驻地安装的通信设备的微控制器采用的呼叫路由软件中，通过该呼叫路由软件将数字化语音和数据服务提供给客户站点。 号码替换机构根据需要自动选择性地修改原始（已拨）电话号码的数字，以符合为目的地设备服务的通信链路的连接性要求，从而使得呼叫到达目的地设备。

公开(公告)号：US20030016797A1

公开(公告)日：2003-01-23

申请号：US09910699

申请日：2001-07-20

申请人： Adtran, Inc.

发明人： Jon Thomas Zakrzewski ,  Robert Allen Barrett ,  Thomas L. Ballard III ,  John B. Wilkes JR.

IPC分类号： H04M011/00

CPC分类号： H04L47/10

摘要： An autobaud mechanism is executed by transceivers coupled to opposite ends of a communication loop, such as an extended range SDSL loop, to resolve the maximum data rate that can be supported by the loop, using signal power and quality measurements to first estimate the length of the SDSL loop and thereafter iteratively adjust baud rate and/or number of bits/per baud, as necessary, to realize an SDSL baud rate that will ensure error-free transmission over the loop.

摘要翻译： 自动波特率机制由耦合到通信环路的相对端（例如扩展范围SDSL环路）的收发器执行，以解决可由环路支持的最大数据速率，使用信号功率和质量测量来首先估计长度 SDSL循环，然后根据需要迭代地调整波特率和/或位数/每个波特数，以实现SDSL波特率，以确保无循环传输。

公开(公告)号：US20020039404A1

公开(公告)日：2002-04-04

申请号：US09891967

申请日：2001-06-26

申请人： Adtran, Inc.

发明人： Stacy Murphree ,  Jason N. Morgan

IPC分类号： H04M001/24 ,  H04M003/08

CPC分类号： H04M3/30 ,  H04M1/24 ,  H04M3/40

摘要： A loop loss measurement and reporting mechanism for a digital data services unit obviates interaction with a test unit at a far end of the loop, by relying upon a priori knowledge of the signal power and spectral content of a data port at the far end of the loop to conduct threshold detection and power level measurements. A received signal is amplified by amplifier circuitry, the gain of which is controllably adjusted by the microcontroller based upon the outputs of threshold detectors and power level measurement circuitry that monitor the amplified received signal. A front panel display is controlled by the microcontroller to display loop loss parameter information. To measure and report loop loss, the digital data services unit turns off its transmitter for a prescribed period of time and monitors an in-band signal of known power and spectral content sourced from the far end of the loop. In response to this measurement it iteratively adjusts, as necessary, the amplifier gains, and illuminates the LED display device in accordance with the power measurement.

摘要翻译： 用于数字数据服务单元的环路损耗测量和报告机制通过依赖于在远端的数据端口的信号功率和频谱内容的先验知识来消除与环路远端的测试单元的交互 循环来进行阈值检测和功率电平测量。 接收到的信号由放大器电路放大，其增益基于阈值检测器和监视放大的接收信号的功率电平测量电路的输出由微控制器可控地调节。 前面板显示由微控制器控制，显示环路丢失参数信息。 为了测量和报告环路损耗，数字数据业务单元在规定的时间内关闭发射机，并监测来自环路远端的已知功率和频谱内容的带内信号。 响应于该测量，根据需要根据需要迭代地调整放大器增益，并根据功率测量照亮LED显示装置。