DIN ETS 300048:1998-08

This European Telecommunication Standard (ETS) defines the stage one of the Packet Mode Bearer Service (PMBS) provided by the B-channel of the user access 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 1.130 [1]), but does not deal with the details of the human Interface itself. This ETS makes use of ETS 300 007 [7], which is a stage 3 ETS, in Order to provide a description of the procedures. This mechanism would not normally be used in a stage 1 Standard. This ETS does not define details of the interworking requirements of private ISDNs with the public ISDN. In addition this ETS specifies the base functionality where the Service is provided to the user via a private ISDN. This ETS 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 ETS. The ISDN Virtual Call (VC) and Permanent Virtual Circuit (PVC) bearer Service category provide the unrestricted transfer (without alteration) of user Information in a packetised manner over a virtual circuit between reference points via the basic and primary rate access. Each of the reference points can be either an S or coincident S and T reference point. NOTE: Network Operators can also provide Information transfer with the same attributes where the reference point is T. ISDN VC and PVC bearer service category is described in CCITT Recommendation 1.232 [8]. This ETS is applicable to the stage three Standards for the ISDN PMBS. The term "stage three" is also defined in CCITT Recommendation 1.130 [1]. Where the text indicates the status of a requirement, (i.e. as strict command or Prohibition, as authorisation leaving freedom, as a capability or possibility), this shall be reflected in the text of the relevant 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.