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ExtErlBTraffic()

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To estimate what how much traffic a trunk group of known lines can be offered at a given blocking figure, use:

 

=ExtErlBTraffic(x,y,z)

 

This function takes three parameters:

 

•x is the blocking figure
•y is the number of lines
•z is the percentage of calls that are immediately retried

 

For example, to estimate how much traffic a trunk group of 200 lines can carry at 0.030 (3%) blocking, assuming that 70% of blocked calls are immediately retried, enter

 

=ExtErlBTraffic(0.030,200,70)

The answer should be 186.877

 

As with other Excel functions, you can either enter absolute values as the parameters, or you can add references to other cell on the same workbook or other open workbooks.  If reference is made to another cell for the retrial parameter, please note that that cell should be formatted as a number and not as a percentage.