Generally, use either the list measurements trunk-group summary or list performance trunk-group report for determining trunk group blockage. The system performs all appropriate calculations and displays results in reports. However, to be complete, the equations and an example are included.

The following equations will help to determine the Percent Blocking one-way outgoing and two-way trunk groups.

One-Way Trunk Group (outgoing)

Two-Way Trunk Group

Example:

With the following data, determine the Percent Blocking of a two-way CO trunk group without a queue:

• Total Seizures = 280

• Incoming Seizures = 170

• Group Overflow = 6

Using the equation for two-way trunk groups, you can calculate average Percent Blocking as follows: