4.13 Queueing network In the queueing network of Figure P4.13, all service times are negative exponential and the two arrival processes shown are independent and Poisson.
There is space for one
waiting user at the
indicated point in front of queueing system 3. Whenever that
queueing space is occupied,
this "blocks" the departure of users from system 1
and from system 2.
No space for waiting exists in front of either system 1 or system 2.
Prospective users of
either system are turned away if that system is either busy or
blocked at the time of user