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1. 发明授权

US06920217B2 Method and apparatus for transient suppression in an integrated POTS/DSL line card 有权
标题翻译：集成POTS / DSL线路卡中瞬态抑制的方法和装置
公开(公告)号：US06920217B2
公开(公告)日：2005-07-19
申请号：US10278755
申请日：2002-10-22
申请人： Michael Dziawa , Scott McClennon , Francois Tremblay , S. Donald McGinn
发明人： Michael Dziawa , Scott McClennon , Francois Tremblay , S. Donald McGinn
IPC分类号： H04L27/00 , H04L27/26 , H04M11/06
CPC分类号： H04M11/062 , H04L27/0002 , H04L27/2601
摘要： Combined plain old telephone system (POTS) and digital subscriber loop (DSL) line card capable of suppressing low frequency transients. The line card includes the following elements. A DSL receive path receives DSL data from a loop. A POTS receive path receives POTS data from the loop. A combined POTS and DSL transmit path transmits POTS and DSL data to the loop. An impedance generator is coupled between the POTS receive path and the combined POTS and DSL transmit path for synthesizing impedance for signals in the combined POTS and DSL transmit path. A low frequency detector selectively applies a high pass filter to an output of the impedance generator for filtering the low frequency transients. Further, a clipped signal detector and a variable pole high pass filter are provided in the POTS receive path. The clipped signal detector in the POTS receive path triggers a switch that discharges stored transient energy in the receive path. The variable pole high pass filter in the POTS receive path is modified during ringing and hook switch activity, by the line card controller, in order to attenuate transient signals.
摘要翻译：组合普通老式电话系统（POTS）和数字用户回路（DSL）线卡，能够抑制低频瞬变。线卡包括以下元素。 DSL接收路径从循环接收DSL数据。 POTS接收路径从循环接收POTS数据。组合的POTS和DSL传输路径将POTS和DSL数据传输到环路。阻抗发生器耦合在POTS接收路径和用于合成POTS和DSL发送路径中的信号的阻抗的组合的POTS和DSL发送路径之间。低频检测器选择性地向阻抗发生器的输出端施加高通滤波器以对低频瞬变进行滤波。此外，在POTS接收路径中设置有限幅信号检测器和可变杆高通滤波器。 POTS接收路径中的限幅信号检测器触发释放接收路径中存储的瞬态能量的开关。 POTS接收路径中的可变极点高通滤波器在振铃和挂机开关动作期间被线路卡控制器修改，以便衰减瞬态信号。

2. 发明授权

US07209554B2 Ringing controller 有权
标题翻译：振铃控制器
公开(公告)号：US07209554B2
公开(公告)日：2007-04-24
申请号：US10281406
申请日：2002-10-24
申请人： S. Donald McGinn
发明人： S. Donald McGinn
IPC分类号： H04M1/00 , H04M9/00
CPC分类号： H04M19/02
摘要： In a telecommunications system, a switching device selectively applies one of two different voltage supplies to a common node. A first of the voltage supplies is coupled to the common node by a first switch and a second of the voltage supplies is coupled to the common node by a second switch. The switching device includes the following elements. A difference detector detects a difference between the first and second voltage supplies. A control circuit selectively enables one of the first and second switches and disables the other of the first and second switches, for switching between the first and second voltage supplies in response to the difference detector. The control circuit performs the switching between the first and second voltage supplies when the detected difference falls below a predetermined threshold.
摘要翻译：在电信系统中，交换设备选择性地将两个不同电压源之一施加到公共节点。电压源中的第一个通过第一开关耦合到公共节点，并且第二电压源通过第二开关耦合到公共节点。开关装置包括以下元件。差分检测器检测第一和第二电压源之间的差异。控制电路选择性地启动第一和第二开关中的一个并且禁用第一和第二开关中的另一个，以响应于差分检测器在第一和第二电压源之间切换。当检测到的差异低于预定阈值时，控制电路执行第一和第二电压源之间的切换。

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