We consider two single-server queues in tandem. The customers
receive service at the first station and then they proceed
to the second. There are no intermediate waiting positions
and, so, the blocking phenomenon is observed. The arriving
customers who find the first station unavailable (busy
or blocked) behave like retrial customers. We consider
the case of “constant retrial policy.” For
such a system, we obtain the system state probabilities
in steady state in terms of generating functions. We present
also some interesting measures of the system performance
and directly deduce results for the corresponding ordinary
(without retrials) model. We consider, finally, the special
case of exponential service times as an example.