TRANSMISSION QUALITY MONITOR APPARATUS, AND TRANSMISSION QUALITY MONITOR METHOD AND PROGRAM THEREOF,申请号JP20050091222-传众专利搜索

TRANSMISSION QUALITY MONITOR APPARATUS, AND TRANSMISSION QUALITY MONITOR METHOD AND PROGRAM THEREOF

申请公布号：JP2006279192(A)

申请号：JP20050091222

申请日期：2005.03.28

申请公布日期：2006.10.12

申请人：

SUMITOMO OSAKA CEMENT CO LTD

发明人：MIYAJI MASAHIDE

分类号：G01M11/02;H04B10/07;H04B10/077;H04J1/00;H04J14/00;H04J14/02

主分类号：G01M11/02

摘要：<P>PROBLEM TO BE SOLVED: To achieve proper monitoring for ensuring transmission quality in the optical transmission of analog signals including video signals of CATV employing an SCM transmission system. <P>SOLUTION: An LPF 2 extracts an intensity signal of a video signal component subjected to subcarrier multiplex processing from an optical signal of an optical transmission line L and supplies the extracted signal to a CPU 5. BPFs 3B1 to 3Bn whose pass bands are set to eliminate frequency bands of the video signals, supply only noise components not including video signal components to wave detectors 4D1 to 4Dn of the poststage, and supply the intensity signals of noise with frequencies of the pass bands to the CPU 5. The CPU 5 calculates relative noise strength in a plurality of the frequency bands from the intensity signals, evaluates the frequency dependence of the noise, determine deteriorated contents of the optical transmission system on the occurrence of a fault, and outputs a deterioration notice signal to inform the downstream of the optical transmission line L about the determined deteriorated contents. <P>COPYRIGHT: (C)2007,JPO&INPIT