公开(公告)号：US07276913B1

公开(公告)日：2007-10-02

申请号：US10981361

申请日：2004-11-04

Applicant: William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

Inventor： William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

IPC: G01R31/11 ,  G01R31/02

CPC classification number: G01R31/021 ,  G01R31/11

Abstract: A cable tester tests cable to determine a cable status. A mode selector selects one of a first operating mode and a second operating mode. A pretest module senses activity on the cable and selectively enables testing based on the sensed activity when in the first operating mode and enables testing when in the second operating mode. A test module is enabled by the pretest module, transmits a test pulse on the cable, measures a reflection amplitude and calculates a cable length. The cable status includes an open status, a normal status and a short status. The test module determines the cable status based on the measured amplitude and the calculated cable length.

Abstract translation: 电缆测试仪测试电缆以确定电缆状态。 模式选择器选择第一操作模式和第二操作模式之一。 预测试模块感测电缆上的活动，并且当在第一操作模式下选择性地基于感测到的活动进行测试，并且能够在第二操作模式下进行测试。 测试模块由预测试模块启用，在电缆上发送测试脉冲，测量反射幅度并计算电缆长度。 电缆状态包括打开状态，正常状态和短状态。 测试模块根据测量的幅度和计算的电缆长度来确定电缆状态。

公开(公告)号：US07246018B1

公开(公告)日：2007-07-17

申请号：US10852540

申请日：2004-05-24

Applicant: William Lo ,  Francis Campana

Inventor： William Lo ,  Francis Campana

IPC: G01R29/26

CPC classification number: G01R31/31727 ,  G01R31/31715 ,  G01R31/318552

Abstract: An interpolator testing system and method comprises an interpolator that includes a phase shift module. The phase shift module receives a reference clock signal and generates M clock signals having phase shifts in increments of 360/M degrees relative to the reference clock signal. A phase select module receives the reference clock signal and a recovered clock signal during a normal mode and generates a select signal based on a comparison of the reference clock signal and the recovered clock signal during the normal mode. A selector receives the M clock signals and outputs one of the M clock signals as the recovered clock signal based on the select signal. A recovered clock counter counts an attribute of the recovered clock signal during a test mode. The phase select module sequentially selects the M clock signals N times during the test mode.

Abstract translation: 内插器测试系统和方法包括包括相移模块的内插器。 相移模块接收参考时钟信号并产生具有相对于参考时钟信号的360 / M度增量的相移的M个时钟信号。 相位选择模块在正常模式期间接收参考时钟信号和恢复的时钟信号，并且在正常模式期间基于参考时钟信号和恢复的时钟信号的比较产生选择信号。 选择器接收M个时钟信号，并根据选择信号输出M个时钟信号之一作为恢复的时钟信号。 恢复的时钟计数器在测试模式期间计数恢复的时钟信号的属性。 相位选择模块在测试模式期间顺序选择M次时钟信号N次。

公开(公告)号：US07190172B1

公开(公告)日：2007-03-13

申请号：US10957285

申请日：2004-10-01

Applicant: William Lo ,  Yiqing Guo

Inventor： William Lo ,  Yiqing Guo

IPC: G01R31/02

CPC classification number: H04M3/28 ,  G01R31/021 ,  G01R31/11

Abstract: A physical layer device includes first, second, third and fourth twisted pairs. First, second, third and fourth hybrid devices communicate with the first, second, third and fourth twisted pairs, respectively. First, second, third and fourth cable testers communicate with the first, second, third and fourth hybrid devices, respectively. Each of the cable testers tests the first, second, third and fourth twisted pairs and determines a cable status of the first, second, third and fourth twisted pairs during first, second, third and fourth periods, respectively. At least one of the first, second, third and fourth periods overlaps another of the first, second, third and fourth periods.A cable testing system and method tests cable and determines status, cable length and reflection amplitude. The test module includes a pretest state machine that senses activity on the cable and enables testing if activity is not detected for a first period. A test state machine is enabled by the pretest state machine, transmits a test pulse on the cable, measures a reflection amplitude and calculates a cable length. The test module determines the status based on the measured amplitude and the calculated cable length. A lookup table includes a plurality of sets of reflection amplitudes as a function of cable length. The test module determines the status using the lookup table, the reflection amplitude and the cable length.

Abstract translation: 物理层设备包括第一，第二，第三和第四双绞线。 第一，第二，第三和第四混合设备分别与第一，第二，第三和第四双绞线通信。 第一，第二，第三和第四电缆测试仪分别与第一，第二，第三和第四混合设备通信。 每个电缆测试仪测试第一，第二，第三和第四双绞线，并且分别在第一，第二，第三和第四周期期间确定第一，第二，第三和第四双绞线的电缆状态。 第一，第二，第三和第四周期中的至少一个与第一，第二，第三和第四周期中的另一个重叠.A电缆测试系统和方法测试电缆并确定状态，电缆长度和反射幅度。 测试模块包括一个预测状态机，它检测电缆上的活动，并能够测试在第一个周期内是否没有检测到活动。 测试状态机由预测状态机使能，在电缆上发送测试脉冲，测量反射幅度并计算电缆长度。 测试模块根据测量的幅度和计算的电缆长度来确定状态。 查找表包括作为电缆长度的函数的多组反射幅度。 测试模块使用查找表，反射幅度和电缆长度来确定状态。

公开(公告)号：US07068043B1

公开(公告)日：2006-06-27

申请号：US11066755

申请日：2005-02-25

Applicant: William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

Inventor： William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

IPC: G01R31/11

CPC classification number: H04L1/248 ,  H04L43/50

Abstract: A cable tester tests cable to determine a cable status. The cable status includes an open status, a normal status and a short status. A pretest module senses activity on the cable and selectively enables testing based on said sensed activity. A test module is enabled by the pretest module, transmits a test pulse on the cable, measures a reflection amplitude and calculates a cable length. The test module determines the cable status based on the measured amplitude and the calculated cable length.

Abstract translation: 电缆测试仪测试电缆以确定电缆状态。 电缆状态包括打开状态，正常状态和短状态。 预测试模块感测电缆上的活动，并且基于所述感测的活动选择性地启用测试。 测试模块由预测试模块启用，在电缆上发送测试脉冲，测量反射幅度并计算电缆长度。 测试模块根据测量的幅度和计算的电缆长度来确定电缆状态。

公开(公告)号：US07019533B1

公开(公告)日：2006-03-28

申请号：US11129203

申请日：2005-05-13

Applicant: William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

Inventor： William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

IPC: G01R31/02 ,  G01R31/11

CPC classification number: G01R31/11 ,  G01R31/025 ,  G01R31/026 ,  G01R31/088

Abstract: A physical layer device communicates over a cable and includes a cable tester that determines a cable status. The cable tester includes a pretest module that senses activity on the cable. A test module transmits a test pulse on the cable, measures reflection amplitude, calculates a cable length, and determines the cable status based on the measured amplitude and the calculated cable length. A first digital signal processor (DSP) communicates with a first pair of the cable and includes a first echo canceller and a first finite impulse response filter with first taps. A second DSP communicates with a second pair of the cable and includes a second echo canceller and a second finite impulse response filter with second taps. At least one of the physical layer device and the cable tester estimates skew between the first and second pairs based on values of the first and second taps.

Abstract translation: 物理层设备通过电缆进行通信，并且包括确定电缆状态的电缆测试器。 电缆测试仪包括一个预测试模块，用于检测电缆上的活动。 测试模块在电缆上传输测试脉冲，测量反射幅度，计算电缆长度，并根据测量的幅度和计算的电缆长度确定电缆状态。 第一数字信号处理器（DSP）与第一对电缆通信，并且包括第一回波消除器和具有第一抽头的第一有限脉冲响应滤波器。 第二DSP与第二对电缆通信，并且包括第二回波消除器和具有第二抽头的第二有限脉冲响应滤波器。 物理层设备和电缆测试仪中的至少一个基于第一和第二抽头的值来估计第一对和第二对之间的偏差。

公开(公告)号：US07012436B1

公开(公告)日：2006-03-14

申请号：US11093101

申请日：2005-03-29

Applicant: Donald Pannell ,  William Lo ,  Yiqing Guo

Inventor： Donald Pannell ,  William Lo ,  Yiqing Guo

IPC: G01R31/02

CPC classification number: G01R31/083 ,  G01R31/088 ,  G01R31/11

Abstract: A physical layer device is adapted to communicate with a cable medium and communicates with an indicator. The physical layer device includes a first input/output terminal, a first transceiver that communicates with the first input/output terminal that is adapted to be connected to a cable medium, and a cable tester that tests the cable medium and determines a cable status using a pretest module. The pretest module senses activity on the cable medium and enables testing if activity is not detected for a first period, and a test module that is enabled by said pretest module, transmits a test pilse on the cable medium, measures a reflection amplitude and calculates a cable length. The cable tester determines the cable status based on the measured amplitude and the calculated cable length, and the indicator indicates at least one of cable testing status during the test and the cable status after the trst. The indicator also inducates at least one of link presence, link absence, link acitivty, link duplex and link speed of the first input/output terminal during normal operation.

Abstract translation: 物理层设备适于与电缆介质通信并与指示器通信。 物理层设备包括第一输入/输出端子，与适于连接到电缆介质的第一输入/输出端子通信的第一收发器，以及测试电缆介质并且使用 一个预测试模块。 预测试模块感测电缆介质上的活动，并且能够测试在第一时间段内是否没有检测到活动，并且由所述预测试模块启用的测试模块在电缆介质上传送测试薄片，测量反射幅度并计算 电缆长度。 电缆测试仪根据测量的幅度和计算出的电缆长度来确定电缆状态，并且指示灯表示测试期间的电缆测试状态和trst之后的电缆状态中的至少一个。 该指示器还在正常操作期间引入第一输入/输出端子的链路存在，链路缺失，链路活动性，链路双工和链路速度中的至少一个。

公开(公告)号：US07005861B1

公开(公告)日：2006-02-28

申请号：US10401221

申请日：2003-03-27

Applicant: William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

Inventor： William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

IPC: G01R31/11

CPC classification number: G01R31/021 ,  G01R31/11

Abstract: A physical layer device is provided that includes an autonegotiation circuit that negotiates a link with a link partner at first and second link speeds. The physical layer device also includes a cable tester that tests a cable and that determines a cable status of the cable before autonegotiation circuit negotiates the link at the first and second link speeds.

Abstract translation: 提供了物理层设备，其包括在第一和第二链路速度下协商与链路伙伴的链路的自动协商电路。 物理层设备还包括测试电缆的电缆测试器，并且在自动协商电路以第一和第二链路速度协商链路之前确定电缆的电缆状态。

公开(公告)号：US07002354B1

公开(公告)日：2006-02-21

申请号：US10967602

申请日：2004-10-18

Applicant: Donald Pannell ,  William Lo ,  Yiqing Guo

Inventor： Donald Pannell ,  William Lo ,  Yiqing Guo

IPC: G01R31/11

CPC classification number: G01R31/083 ,  G01R31/088 ,  G01R31/11

Abstract: A physical layer device that is adapted to communicate with a cable medium and that includes an indicator comprises a first input/output terminal and a first transceiver that communicates with the first input/output terminal that is adapted to be connected to the cable medium. A detector detects a power over Ethernet (POE) device. A switching device selectively provides power from a power supply over the cable medium when the detector detects the POE device. A cable tester communicates with the first transceiver, tests the cable medium and determines a cable status, and delays testing of the cable medium when the detector detects the POE device until the switching device provides the power. The indicator indicates at least one of cable testing status during the test and the cable status after the test.

Abstract translation: 适于与电缆介质通信并且包括指示符的物理层设备包括与适于连接到电缆介质的第一输入/输出终端通信的第一输入/输出终端和第一收发器。 检测器检测以太网供电（POE）设备。 当检测器检测到POE设备时，开关设备选择性地通过电缆介质从电源提供电力。 电缆测试器与第一收发器通信，测试电缆介质并确定电缆状态，并且当检测器检测到POE设备直到交换设备提供电源时，延迟对电缆介质的测试。 该指示器表示测试期间的电缆测试状态和测试后的电缆状态中的至少一个。

公开(公告)号：US06980007B1

公开(公告)日：2005-12-27

申请号：US10400367

申请日：2003-03-27

Applicant: William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

Inventor： William Lo ,  Yiqing Guo ,  Tak Tsui ,  Tsin-Ho Leung ,  Runsheng He ,  Eric Janofsky

IPC: G01R31/08 ,  G01R31/11

CPC classification number: G01R31/083 ,  G01R31/088 ,  G01R31/11

Abstract: A physical layer device that communicates over a cable comprises a cable tester that determines a cable status, which includes an open status, a short status, and a normal status. The cable tester includes a pretest module that senses activity on the cable and selectively enables testing based on the sensed activity. A test module is enabled by the pretest module, transmits a test pulse on the cable, measures a reflection amplitude, calculates a cable length, and determines the cable status based on the measured amplitude and the calculated cable length. An insertion loss estimator communicates with the cable tester and estimates insertion loss of the cable. A return loss estimator communicates with the cable tester and estimates return loss of the cable based on gain parameters of the physical layer device.

Abstract translation: 通过电缆进行通信的物理层设备包括电缆测试器，其确定电缆状态，其包括打开状态，短状态和正常状态。 电缆测试仪包括一个预测试模块，用于检测电缆上的活动，并根据感测到的活动选择性地进行测试。 测试模块由预测试模块启用，在电缆上传输测试脉冲，测量反射幅度，计算电缆长度，并根据测量的幅度和计算出的电缆长度确定电缆状态。 插入损耗估计器与电缆测试仪通信，并估计电缆的插入损耗。 回波损耗估计器与电缆测试仪通信，并根据物理层设备的增益参数估计电缆的回波损耗。

公开(公告)号：US06943712B1

公开(公告)日：2005-09-13

申请号：US10795907

申请日：2004-03-08

Applicant: Pierte Roo ,  Francis Campana ,  William Lo

Inventor： Pierte Roo ,  Francis Campana ,  William Lo

IPC: H03M1/10

CPC classification number: H03M1/109 ,  H03M1/12

Abstract: A nonlinearity detection system and method for an analog to digital converter (ADC) includes a triangular wave generator that generates a triangular wave that is output to the ADC. A differentiator module communicates with the ADC and generates an output signal that is based on an output of the ADC and a delayed output of the ADC. A nonlinearity detection module detects slope discontinuities in the output signal of the differentiator module.

Abstract translation: 用于模数转换器（ADC）的非线性检测系统和方法包括三角波发生器，其产生输出到ADC的三角波。 微分器模块与ADC进行通信，并产生基于ADC输出和ADC延迟输出的输出信号。 非线性检测模块检测微分器模块的输出信号中的斜率不连续性。