Network Effectiveness Ratio (NER)

In telecommunications, the Network Effectiveness Ratio (NER) measures the ability of a network

Telecommunications network

A telecommunications network is a collection of terminals, links and nodes which connect together to enable telecommunication between users of the terminals. Networks may use circuit switching or message switching. Each terminal in the network must have a unique address so messages or connections...

 to deliver a call to the called terminal. Busy signals and other call failure due to user behaviour are counted as "successful call delivery" for NER calculation purposes. Unlike ASR, NER excludes the effects of customer and terminal behaviour.

The NER is a measure of network quality defined in ITU-T Recommendation E.425.