Resource Dimensioning Using Erlang-B and Erlang-C

Resource dimensioning is an important step of architecture design. The system architect needs to study the system performance requirements and come up with an architecture that will meet or exceed the requirements in a cost effective fashion. By resources we mean any hardware or software entity needed to perform transactions initiated by customers. For example, if you are developing a telephone switching system, resources would be things like outgoing digital trunks, timeslots, tone detectors etc.

In this article we will focus on resource dimensioning using Erlang-B and Erlang-C formulas. Many times resource dimensioning is determined by simulating the system being developed. Simulating the system is often an expensive endeavor and in most systems reasonably good results can be obtained by using the Erlang formulas.

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