TRANSMISSION SYSTEM, TRANSMISSION DEVICE, AND TRANSMISSION METHOD

• Main Authors: OMACHI TAKUYA, SABETTO YOSHIKAZU
• Format: Patent
• Language: English; Japanese
• Published: 14.12.2017
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION

PROBLEM TO BE SOLVED: To make it possible to detect a sign of a failure before occurrence of the failure in a main signal system and perform changeover of an operation system/non-operation system based on the sign of the failure to suppress influence on a main signal in a shorter period of time.SOLUTION: A transmission system having a redundant configuration of an operation system and non-operation system includes transmission devices between which a CCM frame standardized by ITU-T (Y1731) is transmitted, where transmission time is inserted into the CCM frame by a transmission device of a preceding stage. A transmission device, when receiving the CCM frame into which the transmission time is inserted from the transmission device of the preceding stage, detects its reception time and extracts the transmission time from the CCM frame. A delay amount (=reception time-transmission time) is calculated on the basis of the reception time and the transmission time; on the basis of the delay amount, whether or not to execute changeover of the operation system and non-operation system is determined.SELECTED DRAWING: Figure 7 【課題】主信号系に障害が発生する前に障害の予兆を検知でき、その障害の予兆に基づいて運用系／非運用系の切替えをおこなうことで、主信号の影響をより短時間に抑える。【解決手段】運用系と非運用系の冗長構成を有する伝送システムにおいて、ＩＴＵ−Ｔ（Ｙ１７３１）で標準化されているＣＣＭフレームを伝送装置間で伝送するにあたり、前段の伝送装置においてＣＣＭフレームに送信時刻を挿入する。自伝送装置においては、送信時刻が挿入されたＣＣＭフレームを当該前段の伝送装置から受信する際、その受信時刻を検出するとともに、ＣＣＭフレームから送信時刻を抽出する。その受信時刻および送信時刻に基づいて遅延量（＝受信時刻−送信時刻）を算出し、当該遅延量に基づいて、運用系と非運用系の切替えを実行するか否かを決定する。【選択図】図７