Abstract

Traffic engineering
Traffic engineering applies to traditional voice networks. Voice over network is one of the traffic engineering. It is properly size the number of trunks and provision the appropriate amount of bandwidth necessary to carry amount of trunks determined. It is five step process.
1. collect the existing voice traffic :
Collecting information from carrier. There are calls abandoned and all trunks busy. Also Grade of Service (GoS) rating for trunk groups, total traffic carried per trunk group and phone bills to see the carrier’s rates.
2. categorize the traffic by groups:
stand by separating the traffic into inbound and outbound directions.
3. Determine number of physical trunks required to meet the traffic needs:
If you know the amount of traffic generated and the GoS required, then you may calculate the number of trunks.
4. Converting the number of erlangs of traffic to packets or cells per second.

The number of trunks required will differ depending on the traffic probability assumption. There are four basic assumptions.
Potential sources
There can be major difference between planning for infinite versus small number of sources.
Traffic arrival characteristics
It based on a Poisson traffic distribution. Poisson distribution is used for infinite traffic resources.
How the switch handles trunk allocation
The fourth assumption centers around the switching equipment itself.
As mentioned earlier, the purpose of the third step is to calculate the number of physical trunks required.