#
 # Call Gap Simulation using Asychronous Elastic sampled Catch Up Call Generator - AESCUCG
 #
 # Use View source to see the JavaScript used. 
 # Do a save of the source and edit the 
 # parameters and run the page locally on your PC.
 #
 # You can edit the call rate, the number of SSP and the number of call gappers configured.
 #
 # In the telephony books, calls are said to be spaced by an interArrivalTime
 #  
 # The interArrivalTime is often modelled based on a negative exponetial.
 #   	interArrivalTime = -log(1-rand( )) / CallsPerSecond
 #
 # The negative exponetial distribution has the properties that when a call starts does not depend on history.
 #
 # The CallsPerSecond is the mean call rate.
 #
 # A simple call generator can be built that makes a call and waits for the interArrivalTime, 
 # 
 # Most real time systems allow timer interupts.
 #
 # These can be either regular ticks or  started for the wanted duration.
 # This AWK script models what happens if the interArrivalTime required is less that the
 # smallest timer tick.
 #
 # It is possible to model the simple call generator in non real time by looping the simple
 # call generator, and incrementing the simulatedTime by adding interArrivalTime to simulatedTime.
 #
 # This script combines the simulation and a constant time time method and uses a catch up while loop
 # to catch up the simulatedTime each timerTick.
 #
 # This script also models a Call Gapping loosely based on ITU INAP Call Gapping.
 # NOTE: However, instead of storing the gapInterval in each call gapper it is global
 # NOTE: CallGap Messages are not sent to the simulated , 
 # call gapping is applied to all simulated ssp and numbers.
 
 #
 # Time is stored in a variable called simulatedTime and realTime
 #
 #       simulatedTime 	is incremented by the interArrivalTimes once per simulated call
 # 	tickedTime 	is incremented by the timerticks once per timer tick or interupt
 #
 
 # 
 # Every time the tickTimer ticks I would normally call a function called timerTickTimeSliceCode()
 # Every time a simulated call is required I call a function called nextCallOpportunityTimeSlice( simulatedTime )
 #
 
 #
 # The Timer ticks are at a constant interval. This script uses a loop, and does not wait for real time.
 #