# 1.2.6 Interfering signal: iRSS

The **interfering Received Signal Strength** (iRSS), corresponding to the interference level (I), is calculated as a link budget between the <span data-highlighted="true" data-vc="highlighted-text"><span class="_kqswh2mm"><span class="_5pioz8co _189e1dm9 _1il9buyh _19lc184f _d0altlke" data-testid="definition-highlighter">VLR</span></span></span> and the interfering link transmitter (ILT) as described in [ANNEX 5:](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/494649/A5+iRSS+calculation#A5iRSScalculation-A5 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/494649/A5+iRSS+calculation#A5iRSScalculation-A5").

The various interference mechanisms resulting in different iRSS (i.e. unwanted, blocking and intermodulation) are described in Section [1.4.5](https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493804 "https://ecowiki.atlassian.net/wiki/spaces/SH/pages/493804").