The present document specifies the user Test Suite Structure and Test Purposes (TSS&TP) for the TB reference point or
coincident SB and TB reference point (as defined in ITU-T Recommendation I.413 [5]) of implementations conforming
to the standards for the signalling user-network layer 3 specification for ATM traffic descriptor modification with
negotiation by the connection owner of the Digital Subscriber Signalling System No. 2 (DSS2) protocol for the pan-
European Broadband Integrated Services Digital Network (B-ISDN), EN 301 486-1 [3].
A further part of the present document specifies the Abstract Test Suite (ATS) and partial Protocol Implementation
eXtra Information for Testing (PIXIT) proforma based on the present document.