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Percentage Calculation

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  • #34856

    Hi, I am a recent user of the erlang unit and I would like to know the answer for this question.

    * I have a table with the following values:
    – Incoming calls:4
    – Outgoing calls:2
    – % Failures:0
    – % Overfl.:0
    – Total traffic:1,074166667 (erlang)
    – Avg. duration outgoing: 0:31:20

    How can I get the total occupation of the link in percentage during this hour??

    Thank You.

    Barbara N

    There may be something in the design that has been omitted. Is there only one link? The occupancy of one link for one hour is 1 erlang. That would be 100% occupancy of that link.

    Your traffic is given as just a bit over 1 erlang, indicating a percentage of 107% occupancy for the hour is the expected %.

    This is also consistent with an estimate using the holding time. If holding time for the two outgoing calls averaged 31 minutes, this equates to about 103% occupancy (31+31=62) divided by 60 minutes per hour.

    That does not leave any channel available for the incoming calls. And you might assume incoming and outging of same duration, there is a large possibility for error, given the small sample size.

    The above occupancies are inconsistent with no failures and no overflows.

    So – you have more than one channel? Use each channel with a possible occupancy of 1 for the hour, total available is the number of channels, your occupancy is 1.07 / number of channels.

    Second possibility is incorrect label on the call holding time and this is not an average (unless you are speaking about a time period of several hours). In this case, you would assume the average occupany is 31 minutes per hour (outgoing and incoming) and the occupancy is 31/60, which is consistent with no failures or overflows.


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