scope:

This first part of EN 301 068 covers the support of additional traffic parameters for the Broadband Integrated Services Digital Network (B-ISDN) at the T_B reference point or coincident S_B and T_B reference point as defined in ITU-T Recommendation I.413 by means of the Digital Subscriber Signalling System No. two (DSS2) protocol for the pan- European Broadband Integrated Services Digital Network (B-ISDN) as provided by European public telecommunication operators.

It defines the DSS2 protocol procedures, formats and functions needed to support the identified ATM transfer capabilities and the ATM traffic related additional capabilities.

The specifications provided by the present document allow for the signalling of the ATM transfer capabilities and of the additional traffic parameters beyond the ones already specified by EN 300 443-1 for B-ISDN basic call/connection control at the UNI. The additional traffic parameters support a Broadband Connection-Oriented Bearer Service (BCOB) as specified in ITU-T Recommendation F.811.

The present document forms part of the DSS2 family of standards; it specifies extensions to EN 300 443-1 which specifies the control protocol for point-to-point call/bearer connection, and does not repeat states, information elements, messages and procedures contained therein, but only specifies extensions related to additional traffic parameter indications.

This present document does not cover procedures for the negotiation and modification/re-negotiation of the ATM traffic parameters.