This paper analyses the reliability of a cold standby system consisting of twore- pairable units, a switch and a repairman. At any time, one of the two unitsis operating while the other is on cold standby. The repairman may not always atthe job site, or take vacation. We assume that shocks can attack the operatingunit. The arrival times of the shocks follow a homogeneous Poisson process andtheir magni- tude is a random variable following a known distribution. Time onrepairing a failed unit and the length of repairman's vacation follow generalcontinuous probability distributions, respectively. The paper derives a numberof reliability indices: sys- tem reliability, mean time to first failure,steady-state availability, and steady-state failure frequency.
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