发明名称 |
An apparatus and a method for locating a fault of a transmission line |
摘要 |
<p>Locating a fault of a transmission line in a system which performs bidirectional optical communication between a station-side device and plural subscriber devices and in which a transmission line 1 extending from the station-side device is branched by a branching/coupling device into plural transmission lines 2 each connected to the subscriber devices. The present invention provides a supervisory unit to the transmission line 1 and attenuators to respective transmission lines 2. <??>The supervisory unit emits an optical test signal, observes a reflected signal of the test signal while changing the attenuation of the attenuators and locates the fault based on a return time and a return loss when the test signal returns as a reflected signal. <IMAGE></p> |
申请公布号 |
EP1098458(B1) |
申请公布日期 |
2005.12.21 |
申请号 |
EP20000122201 |
申请日期 |
2000.10.13 |
申请人 |
FUJITSU LIMITED |
发明人 |
HORISHITA, MASAKAZU;TSUBAKI, KAZUNARI;SHIMIZU, KAZUYOSHI |
分类号 |
G01B11/00;G01M11/00;G01R31/08;H04B3/46;H04B10/03;H04B10/07;H04B10/071;H04B10/077;H04B10/272;(IPC1-7):H04B10/08 |
主分类号 |
G01B11/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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