This Recommendation specifies the Test Suite Structure and Test Purposes (TSS & TP) for the user attached to the TB reference point or coincident SB and TB reference point (as defined in ITU-T I.413 [1]) of implementations conforming to the procedures for the modification of the peak cell rate traffic parameter by the connection owner in the active phase of the call of the Digital Subscriber Signalling System No. 2 (DSS2) protocol for the Broadband Integrated Services Digital Network (B-ISDN), ITU-T Q.2963.1 [3]. Other Recommendations of the Q.2963.1 family specify the Protocol Implementation Conformance Statement (PICS) proforma and Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT) proforma 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 English.