User guide

DEFINITY Performance Management User Guide, Release 2.0, 585-229-808
9 Set Alerting Parameters
Set Global Alerting Parameters
Issue 1
November 1998
Page 194
The Erlang C model assumes that there is an infinite queue for calls trying
to access the trunk group to wait in until resources are available. This
means that all calls are eventually served.
The Retrial model assumes that some calls are blocked but will retry. The
Retrial model is an approximation using the average of the results of the
Erlang B and Erlang C models.
Choose one of the following options:
• Erlang B
• Erlang C
• Retrial
In the Service objective field, type a number between .001 and .700 that
represents the percent of calls that may be blocked from accessing that
trunk group based on the current call activity. Trunk group grade of
service events are generated when the computed service objective
exceeds the value in this field.
7 Click Save to save the settings.