Assumptions Made When Calculating Circuits Required
To perform calculations in circuit-switched networks several assumptions are made :
- Calls arrivals follow a Poisson distribution
- Holding times follow a Negative Exponential distribution
- Blocked calls are lost or overflow
- There is statistical equilibrium
It is useful to remember that the measurements are averages, and this process deliberately ignores very short term variations in the traffic, but still allows for a small but finite loss. The above assumptions are accurate if applied to circuit switched networks; however they fail when planning for data traffic, small exchanges and sudden sharp peaks in traffic such as that caused by TV and radio phone-in competitions.
Read more about this topic: Traffic Measurement (telecommunications)
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