"This standard defines the stage one of the circuit-mode multiple-rate bearer service category for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications operators. Stage one is an overall service description from the user's point of view (see CCITT Recommendation I.130 [1])@ but does not deal with the details of the human interface itself. This standard defines the interworking requirements of private ISDNs with the public ISDN. In addition@ this standard specifies the base functionality where the service is provided to the user via a private ISDN. The standard does not specify the additional requirements where the service is provided to the user via a telecommunications network that is not an ISDN but does include interworking requirements of other networks with the public ISDN. Charging principles are outside the scope of this standard. The values of the general attributes are outside the scope of this standard. The circuit-mode multiple-rate bearer service category provides unrestricted information transfer at integer multiples of 64 kbit/s between reference points. Each of these reference points can be either a S reference point or coincident S and T reference points (see ITU-T Recommendation I.411 [2]). NOTE: Service providers can also provide information transfer with the same attributes where the reference point is the T reference point. This standard contains the procedures for the on-demand service variant of this bearer service category. The procedures for the permanent and the reserved service variants are outside the scope of this standard. This standard is applicable to the stage two and stage three standards for the ISDN circuit-mode multiple-rate bearer service category. The terms ""stage two"" and ""stage three"" are also defined in CCITT Recommendation I.130 [1]. 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 standard 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 standard"