Describes the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) pro forma for the test specifications for Diameter protocol on the Rf/Ro interface as specified in ETSI TS 132 260 and ETSI TS 132 299 in compliance with the relevant requirements and in accordance with the relevant guidance given in ISO/IEC 9646-7 and ETSI ETS 300 406.