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The causes of the incidents are categorized by the source as follows:
Power cut: a failure in the public electricity supply causes a cut in the power supply of a communications network or service component (and reserve power has run out).
Failure of power unit system: performance incident due to a failure in the power supply systems of an equipment facility.
Cable break: failure of a data cable.
Hardware malfunction: failure of equipment used in the provisison of a communications network or service.
Software malfunction: failure caused by software of equipment used in the provision of a service.
Equipment facility fault: incident related to the conditions (such as temperature or humidity), operability or reliability of an equipment facility.
Update or modification: incident arising from an update or modification of a communications network or service component.
Unknown: cause of the incident cannot be ascertained.
Other: cause cannot be included in any of the above categories.

The source adds the following information: "Telecommunications operators report significant incidents in the performance of their networks and services to Traficom. In Traficom’s Regulation, performance incidents are rated depending on their severity, that is, the affected communications service, the size of geographical area and number of users affected by the incident. There are four levels of severity: A, B, C and D. Level A incidents are the most severe ones and level D incidents the least severe. Telecommunications operators send Traficom detailed reports about incidents of levels A, B and C (not D)."