Here is a brief introduction to the calculator. For more detailed information, press the Help Button. For a running record of the results calculated, press the Results button. Both these functions open new browser windows on your desktop. This traffic model may be used where no overflow facilities are available from the trunk group being designed.
Recall factor is the percentage of calls which immediately retry if their calls are blocked.
Blocking is the failure of calls due to an insufficient number of lines being available. E.g. 0.03 mean 3 calls blocked per 100 calls attempted. Lines is the number of lines in a trunk group. Click on the Unknown radio button representing the unknown variable. Enter the 2 known figures into their edit boxes.