scope:

Part 4 of this I-ETS contains the Abstract Test Suite (ATS) for the Network Access Facility (NAF). The test method used is described in detail and diagrams explaining the test method are presented. The reasons for choosing this test method are also given. The ATS is written in Tree and Tabular Combined Notation (TTCN) and the TTCN is contained in annex A. Annex B contains the Protocol Conformance Test Report (PCTR), annex C contains the Implementation eXtra Information for Testing (IXIT) and annex D contains an Implementation Conformance Statement (ICS).