RECOMMENDATION ITU-R F.1094-1 - MAXIMUM ALLOWABLE ERROR PERFORMANCE AND AVAILABILITY DEGRADATIONS TO DIGITAL RADIO-RELAY SYST ANNEX 1 - Basic considerations related to the maximum allowable error performance and availability degradations to digital ra 1 Introduction 2 Error performance and availability degradations due to frequency sharing on a primary basis 3 Error performance and availability degradations due to frequency sharing on a non-primary basis 4 Error performance and availability degradations due to unwanted emissions 5 General considerations on allowable error performance and availability degradations due to interference