T E Overview : Measures of Subscriber Use

Measures of Subscriber Use A few traffic intensity definitions you should know are: Offered Load, Carried Load, and Overflow Load. A formula follows to show how they fit together. Offered Load The offered load for a trunk group is the amount of traffic the group would carry if it could handle all the service requests that come to it. Saying a particular subscriber generates an offered load of 0.1 Erlang means the subscriber wants to use a trunk one-tenth of the time. Carried Load The carried load on a trunk group is the amount of traffic actually served on the group.  Overflow Load The overflow load is the amount of additional traffic the trunk group would carry if it could handle the service requests that come to it but are blocked. All Possibilities If P(B) is a blocking probability, the offered load (OL), carried load (CL), and overflow (OF) are defined by: CL = OL *[1-P(B)] OF = OL *P(B) OL = CL + OF P(B) = OF/OL Continue with Blocking Probabilities.