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 inte