**3.1.3 The R factor**

The main output from the E-model is the single R value, produced by an equation combining all relevant impairments. The R factor ranges from 0-100 but is basically unacceptable below 50. It is recommended for most networks to arrive at a score above 70 when measuring. A user should therefore always reach for an R value as high as possible for all possible connections. Table 5 describes the various quality and satisfaction categories related to the E-model factor R (ITU-T Rec. G.107 2005).


NOTE - Connection with E-Model Rating R Below 50 are not Recommended

Table 5. E-model related quality and satisfaction categories (ITU-T Rec. G.107 2005).
