The present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information
for Testing (PIXIT) proforma for implementations conforming to the stage three standard for the Generic Addressing
and Transport protocol for the pan-European Integrated Services Digital Network (ISDN).
The present document is applicable to both user and network sides of the T or Tb reference point or coincident S and T
or Sb and Tb reference points and to inter-exchange links.
The normative part of the present document is independent of the underlying signalling system(s) which may include
DSS1, DSS2 and SS7. In addition informative material concerning its application over DSS1 is included.
NOTE: The scope of EN 301 813-1 [1] includes operation over SS7, however ITU-T Recommendation Q.765.4
specifies support for GAT by SS7 in a manner which differs in some respects from EN 301 813-1 [1]. As
the present document is a test specification for EN 301 813-1 [1] no provision is made for such
differences.
EN 301 813-3 [3] specifies the Test Suite Structure and Test Purposes (TSS&TP) related to this ATS and partial PIXIT
proforma.