When you start the Traffic Calculators, a window will appear with four tab controls at the top. Select the tab Call Minutes. The Call Minutes Calculator is divided into three sections. The top section is used to display and enter the daily traffic and number of lines required. Both entry areas in this section have associated radio buttons which you can use to indicate which quantity you are trying to calculate.
The final section contains one box which shows the Busy Hour Traffic corresponding to the displayed daily traffic. There is a small button to the right of this box. Pressing this button transfers the displayed busy hour traffic figure to the corresponding boxes in the Erlang B and Extended Erlang B calculators.
Common to all three calculators, there are five buttons on the right hand side of the window. Click here for information regarding their use.
When entering figures into the edit boxes, a full stop or period should be used as a decimal mark, NOT a comma as is the convention in some European countries.