| QSIG is the network layer protocol in PISN, it is called ATS-QSIG when used in Air Traffic Services Network. Because communication equipment manufacturers may develop ATS-QSIG differently, it's quite necessary to use the conformance test to check whether the ATS-QSIG implementation is consistent with the protocol standart or not.This paper is mainly on the development of the conformance test system and the conformance test of ATS-QSIG.This article is divided into five sections of seven Chapters. The first part includes Chapter 1,2, it introduces the research background and the relevant technology. The second is Chapter 3 that analyzes the PDUs and the singnalling process of ATS-QSIG. The third is Chapter 4, it suggests the test squence generation method using status PDU, besides it optimizes this method by status merging. The forth is Chapter 5, it illustrates how to construct the conformace test system including the software and the hardware. The last part includes Chapter 6,7, it specifies the process of conformance test of ATS-QSIG and analyzes the test results. |