Performance Investigation of Addis Ababa Light Rail Transit Communication Systems

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Addis Ababa University


Railway communication system is an essential part of the railway system. It is the back bone for the railway operation and management, to control and monitor the different subsystems of the railway system. Thus, the data communication services required for the signaling and interlocking system, for passenger information at station terminals, for Supervisory Control and Data Acquisition (SCADA) and telemetry data which are used for monitoring and management of other subsystems such as power should be safe, reliable, effective and efficient. Thus, there is no doubt taking performance investigation of the railway communication system. Because, capabilities and performance of the railway communication systems (subsystems) degrade the safety, reliability, effectiveness and efficiency, and also can affect the railway operation. Assessing performance investigation in Addis Ababa Light Rail Transit (AALRT) communication system is necessary to determine whether or not there is a performance problem requiring action. There are performance problems occurred currently as observed in the AALRT communication system. Most of the performance problems occurred in the transmission system, such as communication failure alarm type 56%, service failure alarm type 8% and equipment failure alarm type 36%. These performance problems could affected the day to day activities of the AALRT such as unable to transmit quickly, accurately and reliably the information and/or data, unable to make emergency calls and fail to transport data for signal system; it makes the dispatcher of the control center unable to real-time monitor important areas like station platforms, important level crossing of line, substation and switch section of depot. This thesis found out all the details or facts and accomplishment about the communication system of the Addis Ababa Light Rail Transit. It also identified, analyzed and studied the root causes for the performance problems; discussed their impact and effect on the system. It also proposed a frame work of KPI parameters for the performance investigation and effective maintenance of the AALRT communication system.



Communication System, Key Performance Indices (KPI), AALRT, SCADA, communication failure alarm, service failure alarm, equipment failure alarm