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公开(公告)号：US6128753A
公开(公告)日：2000-10-03
申请号：US43152
申请日：1998-03-13
CPC分类号： H04M3/085 , H04M3/2254 , H04M3/30 , H04Q3/0075 , H04Q2213/13521
摘要： A fault management system for an access network forms part of a public telecommunications network. In the access network, terminating lines in the form of pairs of copper wires extend from a local switch through a series of nodes to terminal equipment provided for user of the network. The fault management system includes a test head and an access network management system. Each night, the test head performs a series of test on each of the terminating lines. The results of the test are transmitted to the access network management. The test results are then converted into circuit scores, each of which is indicative of the operational quality of the tested circuit. For each node, the circuit scores of the tested circuits passing through the node are combined to produce a node score which is indicative of the operational quality of the node. In order to identify the node having the worst operational quality and therefore most in need of investigation, the nodes are ranked in accordance with their node scores.
摘要翻译： PCT No.PCT / GB96 / 02756 Sec。 371日期1998年3月13日 102（e）1998年3月13日PCT PCT 1996年11月13日PCT公布。 第WO97 / 19544号公报 日期1997年5月29日访问网络的故障管理系统构成公共电信网络的一部分。 在接入网络中，铜线对形式的终端线路从本地交换机通过一系列节点延伸到为网络用户提供的终端设备。 故障管理系统包括测试头和接入网络管理系统。 每天晚上，测试头对每个终端线进行一系列测试。 测试结果被传送到接入网络管理。 然后将测试结果转换为电路分数，每个电路分数表示测试电路的操作质量。 对于每个节点，通过节点的测试电路的电路分数被组合以产生指示节点的操作质量的节点分数。 为了识别具有最差操作质量的节点，因此最需要调查，节点根据其节点分数进行排名。
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公开(公告)号：US5187362A
公开(公告)日：1993-02-16
申请号：US688551
申请日：1991-06-25
申请人： Peter J. Keeble
发明人： Peter J. Keeble
IPC分类号： G01M11/00 , G01M11/02 , H04B10/071
CPC分类号： G01M11/3136 , H04B10/071
摘要： A method is described of detecting loss in a branched optical fibre network comprising a first optical fibre (1) and a plurality of second optical fibres (3) each of which is coupled to the first optical fibre. The first optical fibre (1) constitutes a main line. The method comprises the steps of launching a pulse into the main line (1) and monitoring the main line for changes in attenuation of reflected signals returning from the reflectors (5).
摘要翻译： PCT No.PCT / GB89 / 01454 Sec。 371日期1991年6月25日 102（e）日期1991年6月25日PCT提交1989年12月5日PCT公布。 公开号WO90 / 06498 日期：1990年6月14日。描述了一种检测分支光纤网络中的损耗的方法，包括分别耦合到第一光纤的第一光纤（1）和多个第二光纤（3）。 第一光纤（1）构成主线。 该方法包括以下步骤：向主线（1）发射脉冲，并监测主线，以反映从反射器（5）返回的反射信号的衰减变化。
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3.发明授权OTDR having optically switched amplified output onto test fibre to suppress optical amplifier noise between OTDR pluses 失效OTDR具有将测试光纤放大输出的光学开关，以抑制OTDR优点之间的光放大器噪声
公开(公告)号：US5343286A
公开(公告)日：1994-08-30
申请号：US938218
申请日：1992-10-14
CPC分类号： G01M11/319
摘要： An optical test apparatus includes an optical time domain reflectometer for launching light pulses into a test fibre. An optical amplifier is provided in the light path between the optical time domain reflectometer and the test fibre or amplifying the light pulses. An optical switch is positioned in the light path between the amplifier and the test fibre for preventing light reaching the test fibre between the light pulses launched by the OTDR. Timing structure is provided for synchronising the operation of the optical switch so as to open the switch as a light pulse reaches the switch and close the switch as a light pulse leaves the switch.
摘要翻译： PCT No.PCT / GB91 / 00183 Sec。 371日期：1992年10月14日 102（e）日期1992年10月14日PCT 1991年2月6日提交PCT公布。 公开号WO91 / 12509 日期：1991年8月22日。光学测试装置包括用于将光脉冲发射到测试光纤中的光学时域反射计。 在光时域反射计和测试光纤之间的光路中设置光放大器，或放大光脉冲。 光开关位于放大器和测试光纤之间的光路中，用于防止光通过OTDR发射的光脉冲到达测试光纤。 提供了时序结构，用于使光开关的操作同步，以便当光脉冲到达开关时打开开关，并以光脉冲离开开关闭合开关。
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公开(公告)号：US5022634A
公开(公告)日：1991-06-11
申请号：US399533
申请日：1989-08-21
申请人： Peter J. Keeble
发明人： Peter J. Keeble
CPC分类号： G02B6/4464
摘要： An apparatus and method for introducing a transmission line (5) into a duct (1) through which it is to be propelled by viscous drag of a fluid propellant. A high local flow of fluid is created by inputting fluid, preferably compressed air, adjacent the input of the transmission line to the duct and bleeding a proportion of the fluid from the duct a short distance along from the input. This local flow provides the driving force to progress the transmission line along the first third of the duct against the hydrostatic potential. The extent of the venting via the bleed valve is controllable to control the driving force on the transmission line (5). This technique is especially useful for transmission lines including optical fibres.
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公开(公告)号：US4856760A
公开(公告)日：1989-08-15
申请号：US165990
申请日：1988-03-14
CPC分类号： G01P13/0086 , G02B6/4464 , G02B6/4485
摘要： The propulsive force on an optical transmission line member moving through a tubular passageway can be varied so the line travels at or close to optimum speed without risk of damage to the line or associated apparatus. A curve is provided in a portion of the passageway such that a transmission line subject to unacceptable compressive forces buckles towards the outer side of the curve. A sensor detects the presence or absence of the line at this point and a control circuit varies the propulsive force. Excessive tension in the fibre may also be detected. A modified system uses deflectors to ensure that buckling occurs by bowing in the direction towards the sensor with the transmission line undeflected under correct tension. The invention finds particular application in a method of fibre blowing where an optical fibre transmission line is propelled along a tube by fluid drag.
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