Teletraffic engineering/What is the Engset calculation?/Solution 2

Table 2.1 below shows the results for Engset calculations.

Number of sources 10 20 30
Number of lines 5 5 5
Traffic offered 2 2 2
Probability of blocking 0.0175 0.0294 0.0335

Table 1: - TABLE 2.1 ENGSET CALCULATION RESULTS.

Table 2.2 below shows the results for Binomial calculations.

Number of sources 10 20 30
Number of lines 5 5 5
Traffic offered 2 2 2
Traffic in erlang per source 0.2 0.1 0.0667
Probability of blocking 0.0196 0.0352 0.0409

Table 1: - TABLE 2.2 BINOMIAL RESULTS

Notice that Binomial's assumption that traffic is queued provides a higher blocking probability than Engset.

(This exercise is referenced from Richard Parkinson, Traffic Engineering Techniques in Telecommunications [2].