"This European Telecommunication Standard (ETS) defines the stage 1 of the Broadband Virtual Path Service for Reserved communications (BVPS-R) for a Broadband Integrated Services Digital Network (B-ISDN)@ as provided by European public telecommunication operators. Part 1 of this ETS (ETS 300 455-1 [13]) defines the stage 1 of the Broadband Virtual Path Service for Permanent communications (BVPS-P) for a B-ISDN@ as provided by European public telecommunication operators. This ETS does not specify the additional requirements where the service is provided to the user via a telecommunication network that is not a B-ISDN@ but it does include requirements for interworking of other networks with a B-ISDN. This ETS is applicable to stage two and stage three standards for the BVPS-R. The terms ""stage two"" and ""stage three"" are also defined in CCITT Recommendation I.130 [4]. Where the text indicates the status of a requirement (i.e. as strict command or prohibition@ as authorisation leaving freedom@ or as a capability or possibility)@ this shall be reflected in the text of the relevant stage two and stage three standards. Furthermore@ conformance to this ETS is met by conforming to the stage three standards with the field of application appropriate to the equipment being implemented. Therefore@ no method of testing is provided for this ETS. Charging principles and management operations are outside the scope of this ETS. The BVPS-R provides the transfer of unrestricted digital information between TB or SB/TB reference points. It does not preclude the applicability of the BVPS-R to SB. The provision of the BVPS-R is based on the use of Asynchronous Transfer Mode (ATM) Virtual Path (VP) connections in a B-ISDN"