This Recommendation specifies Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma for the network at the TB reference point or coincident SB and TB reference point (as defined in ITU-T I.413 [4]) of implementations conforming to the procedures for the support of point-to-point release 1 switched virtual channel connections between the calling party and the called party of the Digital Subscriber Signalling System No. 2 (DSS2) protocol for the Broadband Integrated Services Digital Network (B-ISDN), ITU-T Q.2931 [1]. Other ITU-T Recommendations of the Q.2931 family specify the Protocol Implementation Conformance Statement (PICS) proforma and Test Suite Structure and Test Purposes (TSS & TP) based on this Recommendation. NOTE - This Recommendation related to protocol conformance is published only in English, it is based on an external SDO's standard published in one language, English.