Abstract
We analyse a single server queue with Poisson arrivals, two stages of heterogeneous service with different general (arbitrary) service time distributions and binomial schedule server vacations with deterministic (constant) vacation periods. After first-stage service the server must provide the second stage service. However, after the second stage service, he may take a vacation or may decide to stay on in the system. For convenience, we designate our model as M/G 1, G 2/D/1 queue. We obtain steady state probability generating function of the queue length for various states of the server. Results for some particular cases of interest such as M/Ek 1 , Ek 2 /D/1, M/M 1, M 2/D/1, M/E k /D/1 and M/G 1, G 2/1 have been obtained from the main results and some known results including M/Ek /1 and M/G/1 have been derived as particular cases of our particular cases.
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