TELKOM’s telecommunication services was built on a physical network which connect TELKOM with their costumers. The problem on this physical network is the high number of metal cable local network failures. To describe the problems and determine problem elimination priorities, then failure record analysis become initial step of the problem solving.
Papadopoulos et.al (2004) has developed system analysis method by combining the FTA and FMEA methods. Generally, the combining method consist of FTA step and FMEA step. On this research, FTA step is used to describe the metal cable local network problem, and FMEA step is used in term to determine problem elimination priorities based on their Risk Priority Number (RPN) value. Severity, occurence and detection is used to find the RPN value. The FTA step is found 13 basic events of metal cable local network failure mode, and then this 13 basic events is prioritized by FMEA methods. The problem elimination priorities are: environment disturbances; other institution’s activities; human’s activities; animal’s activities; poor in quality installation; poor in material condition; telephone’s component failures; remote pairgain failures; telephone’s string failure; uncontrollable voltages; sentral’s failures; fuse/aristor failures; unstable power.
Environment disturbances is the main factor of metal cable local network failure mode because of their severity, occurences and detection level. As the solution, TELKOM should eliminate this primary problem to reduce the number of metal cable local network failure. Beside that, attention should be focussed by TELKOM in term of other institution activity occurences which still cause metal cable local network failures.
Key words: failure analysis, Jarlokat, FTA method, FMEA method, basic event, RPN value.
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