nTraffic
is an arrival process
ncalls arrive at some
time Ta, measured in sec from 0
ninter-arrival time Ti
(time elapsed between call arrivals);
thus arrival rate per sec is 1/Ti
n and a departure process
ncalls have a
duration or holding time Tc; thus departure rate
is 1/Tc
nTraffic
is measured by averaging over an integration period, Tp. In Erlangs
(utilization): A = Tc / Ti
