Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. two (DSS2) protocol; connection characteristics; ATM transfer capability and traffic parameter indication - Part 1: Protocol specification [ITU-T-Recommendations Q.2961.1 (1995), Q.2961.2 (1997), Q.2961.3 (1997), Q.2961.4 (1997), modified] (Endorsement of the English version EN 301068-1 V 1.2.4 (1998-11) as German Standard)