| Traffic Measurement (telecommunications) |
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The following sections will answer some fundamental questions about Traffic Measurement, such as: What should be measured; when should it be measured; what assumptions are made; and what errors can occur? WHEN SHOULD TRAFFIC BE MEASURED? Traffic Measurements are conducted on a continuous basis and the results compiled into reports for management which are used in management decisions on various time scales. Measurements that are taken every few minutes are used for network management and temporary Routing , measurements every few hours, days and weeks are used for maintenance purposes and measurements that are taken over months or even years are used for long-term network deployment, upgrading and extensions {Link without Title} . To determine normal reference traffic for a network, the ITU recommends that a network traffic analyst must take measurements for the busiest hour of each day for a whole year The busiest hour is defined as that four consecutive quarter hours whose traffic intensity is the greatest. Measurements taken outside the busy hour can be discarded. The reference intensity of traffic is then calculated by taking the average traffic intensity of the top thirty days in the year [2 . Measurements taken on individual days can be discarded. This will give the normal high traffic intensity in the network, allowing network managers to make long-term strategic decisions [2]. ASSUMPTIONS MADE WHEN CALCULATING CIRCUITS REQUIRED To perform calculations in circuit-switched networks several assumptions are made {Link without Title} :
It is useful to remember that the measurements are averages and this process deliberately ignores very short term variations in the traffic, but still allowing 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. TRAFFIC MEASUREMENT ERRORS Measurement errors are caused by faults in equipment or constraints on equipment design. The following five errors are examples of some types of errors that can occur {Link without Title} :
REFERENCES {Link without Title} Penttinen A., ''Chapter 4 – Traffic Modelling and Measurements'', Lecture Notes: S-38.145 - Introduction to Teletraffic Theory, Helsinki University of Technology, Fall 1999. {Link without Title} Kennedy I., ''Why Traffic Measurement?'', School of Electrical and Information Engineering, University of the Witwatersrand, 2003. {Link without Title} Kennedy I., ''What basic data should we measure?'', School of Electrical and Information Engineering, University of the Witwatersrand, 2003. |
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