Question: Periodic Step Function

Hello together, I've just started to do some calculations with maple 9.5 and still in trouble. I would like to modify the step function below to a n-periodic function. In maple version 10 there's a function called "rept" which is not available in my version unfortunately. Does anyone have a ease of use solution? f:=(MTBF,MTTR,t,n) -> piecewise(t<>
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