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公开(公告)号：US5926263A
公开(公告)日：1999-07-20
申请号：US728592
申请日：1996-10-10
CPC分类号： H04B10/035 , H04B10/071
摘要： An OTDR provides both in-service and out-of-service measurement information for an optical transmission system with multiple repeaters. The repeaters include an optical high-loss loop back (HLLB) path and an OTDR path. The OTDR is coupled to the input lines of the optical transmission system via an optical coupler so that both traffic signals and test signals from the OTDR can be transmitted simultaneously. When the OTDR is providing in-service measurement information, test signals in the form of side-tone pulses are transmitted on the transmission system. The wavelengths of the test signals are sufficiently offset from the wavelength of the traffic signal so there is minimal interference between them. The level of the test signals is low relative to the traffic signal to also minimize interference. The OTDR filters out the traffic signal from the returned signal. The HLLB path through the amplifier pairs of each repeater is distinguishable in the filtered returned signal. When the OTDR is providing out-of-service measurement information, the level of the side-tone pulses is increased because interference with traffic signal is no longer a concern. Both the HLLB path and the OTDR path are distinguishable in the filtered returned signal when the higher level out-of-service test pulses are transmitted.
摘要翻译： OTDR为具有多个中继器的光传输系统提供在服务和超时测量信息。 中继器包括光学高损耗环回（HLLB）路径和OTDR路径。 OTDR经由光耦合器耦合到光传输系统的输入线，使得可以同时传输来自OTDR的业务信号和测试信号。 当OTDR提供在线测量信息时，在传输系统上传输侧音脉冲形式的测试信号。 测试信号的波长与业务信号的波长充分偏差，因此它们之间的干扰最小。 测试信号的电平相对于交通信号较低，同时也使干扰最小化。 OTDR从返回的信号中滤除交通信号。 通过每个中继器的放大器对的HLLB路径在滤波的返回信号中是可区分的。 当OTDR提供无服务测量信息时，侧调脉冲的电平会增加，因为不再需要对交通信号的干扰。 当传输较高级别的服务外测试脉冲时，HLLB路径和OTDR路径都可以在滤波的返回信号中进行区分。
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公开(公告)号：US4794642A
公开(公告)日：1988-12-27
申请号：US100697
申请日：1987-09-24
摘要： Control equipment employed in a customer-owned public telephone station prevents a user from making unauthorized telephone calls in a telephone system. Operating under the control of a computer in the station, the control equipment employs a call screening process which restricts the telephone numbers a user can dial to those numbers preselected by a station owner. The telephone numbers are categorized in multiple but distinct groups, each of which represents a specific class of telephone call. The control equipment is responsive to momentary loop breaks occurring on tip and ring lines connecting the station to a central office, and to a loop break provided by the central office which reflects that the far end party has disconnected. The control equipment is also responsive to scheduled as well as unscheduled receipt of dial tone. The combination of the call screening process along with the ongoing loop break and dial tone detection and analysis conveniently provides the desired protection so that the user will be properly charged for telephone calls made from the station. The restrictions incorporated in the station for obtaining this protection are applied with minimal inconvenience for the legitimate user.
摘要翻译： 在客户所属公共电话台中使用的控制设备阻止用户在电话系统中进行未经授权的电话呼叫。 在车站计算机的控制下操作，控制设备采用呼叫筛选过程，该过程限制用户可以拨打由车主所预先选择的号码的电话号码。 电话号码分为多个但不同的组，每个组代表特定类别的电话。 控制设备响应于将车站连接到中心局的尖端和环线上发生的瞬时回路中断，以及由中心局提供的循环中断，这反映出远端方已断开连接。 控制设备也响应于预定的以及非计划的接收拨号音。 呼叫筛选过程的组合以及正在进行的循环中断和拨号音检测和分析方便地提供期望的保护，使得用户将对从站进行的电话进行适当的收费。 对于合法使用者来说，对站点中包含的用于获得此保护的限制的应用最小化。
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3.发明授权Method and apparatus for detecting localized polarization dependent anomalies on optical transmission lines 有权用于检测光传输线上局部偏振相关异常的方法和装置公开(公告)号：US07187860B2
公开(公告)日：2007-03-06
申请号：US10117718
申请日：2002-04-05
IPC分类号： H04B10/00
CPC分类号： H04B10/2569 , H04B10/2572
摘要： The position and amount of localized polarization dependent anomalies such as polarization mode dispersion and/or polarization dependent loss may be measured by applying a polarization modulated probe signal to an optical transmission line. The polarization modulated probe signal is returned via optical feedback paths positioned along the line, and is detected by a probe signal receiver to identify the position and strength of the anomaly.
摘要翻译： 可以通过将偏振调制探测信号应用于光传输线来测量局部偏振相关异常的位置和量，例如偏振模色散和/或偏振相关损耗。 偏振调制的探测信号通过沿线定位的光反馈路径返回，并由探测信号接收机检测以识别异常的位置和强度。
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公开(公告)号：US4782516A
公开(公告)日：1988-11-01
申请号：US66288
申请日：1987-06-25
摘要： Control equipment employed in a customer-owned public telephone station prevents a user from making unauthorized telephone calls in the telephone system. Operating under the control of a computer in the station, the control equipment is responsive to momentary loop breaks occurring on tip and ring lines connecting the station to a central office, and to a loop break provided by the central office which reflects that the far end party has disconnected. The control equipment is also responsive to scheduled as well as as unscheduled receipt of dial tone. The combination of ongoing loop break and dial tone detection and analysis conveniently provides the desired protection for reliable operation of the customer-owned public telephone station in the telephone system. Restrictions incorporated in the station for obtaining the desired protection are applied with minimal inconvenience for the legitimate user.
摘要翻译： 在客户所属的公共电话台中使用的控制设备阻止用户在电话系统中进行未经授权的电话呼叫。 在车站计算机控制下运行时，控制设备响应于将车站连接到中心局的尖端和环线上发生的瞬间回路中断，以及由中心局提供的循环中断，这反映出远端 派对已断开。 控制设备也响应计划以及作为拨号音的非计划接收。 正在进行的循环中断和拨号音检测和分析的组合方便地为电话系统中的客户所属公共电话台的可靠运行提供了期望的保护。 为了获得期望的保护而结合在站中的限制被应用于合法用户的最小的不便。
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