SPN CODE FOR ERLANG LOSS MODEL WITH CHANNELS IN-USE CAN FAIL AND NO 
RECOVERY OF FAILED CALLS.

format 8 
gspn erlang_spn_chan_reco(fr, rr, lam, mu)  
* Places 
Repair 0
CP 5
call_in_use 0
end 
* Timed Transitions 
T0  dep  call_in_use  fr
rep  ind  rr
arr  ind  lam
comp  dep  call_in_use  mu
end 
* Immediate Transitions 
end 
* Input Arcs 
Repair  rep  1
CP  arr  1
call_in_use  comp  1
call_in_use  T0  1
end 
* Output Arcs 
rep  CP  1
arr  call_in_use  1
comp  CP  1
T0  Repair  1
end 
* Inhibtor Arcs 
end 



* Outputs: 
loop i,0,10,.1
expr premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4)
end

end


	OUTPUTS

i=0.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   0.00000000e+00

i=1.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.53959870e-03

i=2.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.95622643e-03

i=3.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98385299e-03

i=4.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98552495e-03

i=5.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98562557e-03

i=6.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563162e-03

i=7.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563199e-03

i=8.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563201e-03

i=9.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563201e-03

i=10.000000
     premptyt(i;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563201e-03


* Outputs: 
expr premptyt(10;erlang_spn_chan_reco, CP; 6, 7, 3, 4)
end

		OUTPUTS

 premptyt(10;erlang_spn_chan_reco, CP; 6, 7, 3, 4):   1.98563201e-03

* Outputs: 
expr premptyt(0,10,1;erlang_spn_chan_reco, CP; 6, 7, 3, 4)
end

		OUTPUTS

error: cannot find system 10 (./erlang_spn_chan_reco_code.txt: line   34).


When, we give the values for initial time, final time and, increment it gives
the above statement. 






