公开(公告)号：US08442074B1

公开(公告)日：2013-05-14

申请号：US12061480

申请日：2008-04-02

申请人： Richard Goodson ,  Stacy Murphree ,  Jason Morgan ,  Stuart Venters

发明人： Richard Goodson ,  Stacy Murphree ,  Jason Morgan ,  Stuart Venters

IPC分类号： H04J3/06

CPC分类号： H04J3/0664 ,  H04L43/0858 ,  H04L43/106

摘要： The present disclosure generally pertains to systems and methods for passing timing information over packet networks. In one exemplary embodiment of the present disclosure, a transmitter inserts a timestamp into various packets being transmitted. A receiver determines the packet delay for each of these packets. The receiver monitors the packet delays of received packets over time to estimate a minimum packet delay for the network. Thereafter, the receiver uses the timestamps of received packets in order to update a local receiver clock signal so that the local receiver clock signal is synchronous to the clock signal used by the transmitter to generate the timestamps. However, the receiver filters the received timestamps such that the effects of packet delay variation to the synchronization of the local clock signals are reduced.

摘要翻译： 本公开通常涉及用于通过分组网络传递定时信息的系统和方法。 在本公开的一个示例性实施例中，发射机将时间戳插入正在传输的各种分组中。 接收器确定每个这些分组的分组延迟。 接收机随时间监视接收到的分组的分组延迟，以估计网络的最小分组延迟。 此后，接收机使用接收分组的时间戳来更新本地接收机时钟信号，使得本地接收机时钟信号与发射机使用的时钟信号同步以产生时间戳。 然而，接收机对所接收的时间戳进行过滤，使得分组延迟变化对本地时钟信号的同步的影响减小。

公开(公告)号：US06584176B2

公开(公告)日：2003-06-24

申请号：US09891967

申请日：2001-06-26

申请人： Stacy Murphree ,  Jason N. Morgan

发明人： Stacy Murphree ,  Jason N. Morgan

IPC分类号： H04M124

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.

公开(公告)号：US06256377B1

公开(公告)日：2001-07-03

申请号：US09318422

申请日：1999-05-25

申请人： Stacy Murphree ,  Jason N. Morgan

发明人： Stacy Murphree ,  Jason N. Morgan

IPC分类号： H04M124

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，数字数据业务单元将其发射机关闭规定的时间段，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。