The present document specifies the stage three of: Signalling protocol for establishing, maintaining and clearing switched virtual path capability for the Broadband-Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident SB and TB reference point (as defined in CCITT Recommendation I.413 [33]) by means of the Digital Subscriber Signalling System No. two (DSS2) protocol. Stage three identifies the protocol procedures and
switching functions needed to support a telecommunications service (see CCITT Recommendation I.130 [32]).
In addition, the present document specifies the protocol requirements at the TB reference point where the service is
provided to the user via a private B-ISDN.
NOTE 1: Procedures at the TB reference point, to support the access of a private B-ISDN to the public B-ISDN, are not explicitly identified in the present document, however, some procedures are applicable only at the TB reference point.
A basic telecommunications service is a fundamental type of service. It forms the basis on which supplementary services may be added.
NOTE 2: Specific requirements of individual B-ISDN connection-oriented basic telecommunication services are
not covered by the present document. Further parts of the present document provide the method of testing and detailed application specific requirements to determine conformance to the present document. The present document is applicable to equipment supporting connection-oriented basic B-ISDN telecommunication
services, to be attached at either side of a TB reference point or coincident SB and TB reference points when used as an
access to the public B-ISDN.
The provision of this service requires the support of the protocol for the basic point-to-point call/bearer connections as
defined in the EN 300 443-1 [18], and the Additional Traffic Capabilities defined in the EN 301 068 series [19].