Open acyclic network of M/M systems #2:=2 A=43 1 negative omental server P=1/3 =4#1:=3(pel A=43 server) M/M/2 Q=2/3 #3:=6 1 negative 入=4 =8/3 exponential serverOpen acyclic network of M/M/. systems #1: m=3 (per server) M/M/2 l=4 #2: m=2 1 negative exponential server #3: m=6 1 negative exponential server P=1/3 Q=2/3 l=4/3 l=4/3 l=8/3 l=4