本文件规定了抽象测试套件（ATS）和部分协议实施额外信息 用于T参考点或重合S和T参考点（如适用）用户侧的测试（PIXIT）形式 在ITU-T建议I.411[11]中定义了符合三个阶段标准的实施 通过以下方式为泛欧综合业务数字网（ISDN）提供第三方（3PTY）补充业务: 数字用户信令系统第1号（DSS1）协议，EN 300 188-1[2]。EN 300 188-3[4]规定了与该ATS和部分PIXIT相关的测试套件结构和测试目的（TSS&TP） 形式规范。其他部分规定了网络侧的TSS&TP、ATS和部分PIXIT形式表 符合EN 300 188的T参考点或重合的S和T参考点- 1 [2].

The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the User side of the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation I.411 [11]) of implementations conforming to the stage three standard for the Three Party (3PTY) supplementary service for the pan-European Integrated Services Digital Network (ISDN) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol, EN 300 188-1 [2].EN 300 188-3 [4] specifies the Test Suite Structure and Test Purposes (TSS&TP) related to this ATS and partial PIXIT proforma specification. Other parts specify the TSS&TP and the ATS and partial PIXIT proforma for the Network side of the T reference point or coincident S and T reference point of implementations conforming to EN 300 188-1 [2].