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].