Talk:Network effectiveness ratio

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The Network Effectiveness Ratio (NER) is a measure of telecommunications network quality defined in ITU-T Recommendation E.425. NER gives a statement of probability if a call attempt is indicated correctly at the call target. NER is calculated as the ratio of the total calls indicated at the target divided by the total call attempts. Usually this value reaches 99 %.

NER has to be set apart from the more common parameter ASR (Answer Seizure Ratio). The ASR gives a statement of probability if a call is established. The ASR is calculated as the ratio of the total established calls divided by the total call attempts. Usually this value reaches 70 %. This difference from the NER is to be found in the behavior of the called target. If the call is not answered or the line is busy, the call attempt is indicated correctly, but no connection is established.

So NER is always greater than ASR.

Source: Translation from de:Network Effectiveness Ratio — Preceding unsigned comment added by 195.110.70.55 (talk • contribs) 16 January 2011 (UTC)