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# Call Gap Simulation using Asychronous Elastic sampled Catch Up Call Generator - AESCUCG
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# 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.
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# You can edit the call rate, the number of SSP and the number of call gappers configured.
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# In the telephony books, calls are said to be spaced by an interArrivalTime
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# The interArrivalTime is often modelled based on a negative exponetial.
#   	interArrivalTime = -log(1-rand( )) / CallsPerSecond
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# The negative exponetial distribution has the properties that when a call starts does not depend on history.
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# The CallsPerSecond is the mean call rate.
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# A simple call generator can be built that makes a call and waits for the interArrivalTime, 
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# Most real time systems allow timer interupts.
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# 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.
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# 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.
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# 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.
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# 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.

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# Time is stored in a variable called simulatedTime and realTime
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#       simulatedTime 	is incremented by the interArrivalTimes once per simulated call
# 	tickedTime 	is incremented by the timerticks once per timer tick or interupt
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# 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 )
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# The Timer ticks are at a constant interval. This script uses a loop, and does not wait for real time.
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