COMMUNICATION SYSTEM

PROBLEM TO BE SOLVED: To provide a communication system that makes it easy to identify a failure occurrence place (determine whether a failure occurrence place is a transmission side communication device or a communication path between communication devices).SOLUTION: A communication system 10 includes: a transmission side communication device 11 for outputting a communication signal; a reception side communication device 12 for receiving, via a communication path, the communication signal output by the transmission side communication device 11; a transmission side communication signal monitoring device 14 for detecting the communication signal at the transmission side communication device 11 side of the communication path; a reception side communication signal monitoring device 15 for detecting the communication signal at the reception side communication device 12 side of the communication path; and a communication state monitoring device 17 for generating management data associating time with a detection signal from the transmission side communication signal monitoring device 14 and the reception side communication signal monitoring device 15.SELECTED DRAWING: Figure 1 【課題】障害発生箇所の特定（障害発生箇所が、送信側通信装置か通信装置間の通信路であるかの判別）を容易にする通信システムの提供。【解決手段】通信信号を出力する送信側通信装置１１と、送信側通信装置１１から出力された通信信号を通信路を介して受信する受信側通信装置１２と、通信路の送信側通信装置１１側にて通信信号を検出する送信側通信信号監視装置１４と、通信路の受信側通信装置１２側にて通信信号を検出する受信側通信信号監視装置１５と、送信側通信信号監視装置１４及び受信側通信信号監視装置１５からの検出信号を時刻に関連付けた管理データを生成する通信状態監視装置１７とを有する通信システム１０を提供する。【選択図】図１