公开(公告)号：US06534997B1

公开(公告)日：2003-03-18

申请号：US09685826

申请日：2000-10-10

Applicant: Masakazu Horishita ,  Kazunari Tsubaki ,  Kazuyoshi Shimizu

Inventor： Masakazu Horishita ,  Kazunari Tsubaki ,  Kazuyoshi Shimizu

IPC: G01R3111

CPC classification number: H04B10/07 ,  H04B10/071 ,  H04B10/27

Abstract: 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.

Abstract translation: 在站侧设备与多个用户设备之间执行双向光通信的系统中定位传输线路故障，并且其中从站侧设备延伸的传输线路1由分支/耦合设备分支成多个传输 线路2每个连接到订户设备。 本发明提供了一种监控单元，用于传输线1和衰减器到相应的传输线2.监控单元发射一个光学测试信号，在改变衰减器衰减的同时观察测试信号的反射信号，并根据 当测试信号作为反射信号返回时，返回时间和回波损耗。