Özet:

This paper deals with the asymptotic analysis of a queueing system model consisting of two orbits, ctservers, t ≥ 0, abandoned and feedbackcustomers. Two independent Poisson streams of customers arrive to the system, an arriving one of type i, i = 1, 2 is handled by an available server, ifthere is any; otherwise, he waits in an infinite buffer queue. A waiting customer of type i who did not get connected to a server will lose his patience andabandon after an exponentially distributed amount of time, the abandoned onemay leave the system (loss customer) or move to the orbit depending of itstype, from which he makes a new attempts to reach the primary queue, thislatter may lose his patience and leave the system definitively (from the orbit)after an exponentially distributed amount of time. When a customer finisheshis conversation with a server, he may comeback to the system for anotherservice

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