SIST ETS 300 217-3 E1:2003

SIST ETS 300 217-3 E1:2003 is the Slovenian standard identical to ETS 300 217-3 Edition 1 from ETSI. It belongs to the Network Aspects (NA) series for the Connectionless Broadband Data Service (CBDS) and defines the supplementary services associated with that service family. In practice, it tells a network provider, engineer, or buyer which extra CBDS service functions are named in the standard and how they relate to the basic bearer services.

What does SIST ETS 300 217-3 E1:2003 specify?

SIST ETS 300 217-3 E1:2003 specifies a recommended set of supplementary services for CBDS, used with the basic bearer services defined in Part 2. The document is written as a stage 1 service description, so it focuses on the user-facing service view rather than signalling details.

The main body is organized into six clauses and one informative annex.

The clauses cover the scope, references, definitions and abbreviations, the list of supplementary services, the association of those services to bearer services, and the definitions of the individual supplementary services.

What are the key requirements of SIST ETS 300 217-3 E1:2003?

SIST ETS 300 217-3 E1:2003 sets out which supplementary services belong to CBDS, how they relate to bearer services, and what each named service means in use. For a reader implementing or assessing CBDS, the important point is that the standard identifies the service options and gives the service-level meaning that later parts of the ETS build on.

Supplementary services are defined for use with CBDS bearer services

Clause 1 states that the supplementary services are meant to be used with the basic bearer services in Part 2, and that these definitions are the basis for the more detailed description in Part 4. In practice, this means the standard is not a standalone service catalogue - it is tied to the bearer service framework of the CBDS series.

The current service set is limited to two named services

Clause 4 identifies the supplementary services currently recognized in this part: Closed User Group (CUG) and address screening. The wording also allows for more services to be identified in future, so the list is treated as a service set for this edition rather than a fixed final catalogue.

Provision of the services is a network option

Clause 5 shows the association between supplementary services and bearer services, and states that provision in a particular network is a service provider option. For a buyer or operator, this means the standard defines the service possibilities, but a network may choose which of them to offer.

CUG supports restricted communication within a defined group

Clause 6.1 explains that the CUG supplementary service lets users form groups with restricted access to and from the group. Members of one CUG can communicate among themselves, and a user may belong to more than one CUG. In practice, this is the service model for private user communities, including virtual private network-style arrangements.

Address screening controls delivery to selected sources and destinations

Clause 6.2 defines address screening as a way to enforce restrictions on the delivery of Protocol Data Units (PDUs) from particular sources and on data transmission to particular destinations. The clause names Metropolitan Area Networks (MANs) and Asynchronous Transfer Mode (ATM)-based networks as the environments where this control applies, which tells implementers where the screening logic is intended to operate.

The stage-1 service model is part of the structure of the ETS

The foreword states that the ETS follows the CCITT Recommendation I.130 three-level structure for telecommunication services. For readers, that means this part sits at the overall service-description level and supports later stages that deal with functional capabilities and signalling.

What terms does SIST ETS 300 217-3 E1:2003 define?

• Asynchronous Transfer Mode (ATM) - the network type named in the address screening clause as one of the environments where the service applies.
• CBDS - Connectionless Broadband Data Service, the service family covered by this ETS.
• Closed User Group (CUG) - a restricted group of users who can communicate within the group but not generally with users outside it.
• Metropolitan Area Network (MAN) - the network environment named alongside ATM for address screening.
• PDU - Protocol Data Unit, the data unit whose delivery can be restricted by address screening.
• Supplementary service - an additional CBDS service associated with the basic bearer services defined in Part 2.

Who uses SIST ETS 300 217-3 E1:2003?

SIST ETS 300 217-3 E1:2003 is used by telecom network planners, service providers, and implementers who need to define or offer CBDS supplementary services. It is also relevant to engineers and quality or procurement staff who need to understand whether a network offers CUG or address screening.

The standard is especially relevant where a network design involves privacy-controlled user groups or delivery restrictions in MANs and ATM-based networks. That makes it useful for service specification, network feature planning, and checking whether a proposed CBDS offering matches the named service model.

What changed in SIST ETS 300 217-3 E1:2003 from the previous edition?

SIST ETS 300 217-3 E1:2003 is identical to ETS 300 217-3 Edition 1.

Which standards are used with SIST ETS 300 217-3 E1:2003?

These companion documents let the reader move from the overview of CBDS, to the bearer service base, to the more detailed service descriptions.

What does the SIST ETS 300 217-3 E1:2003 document contain?

The document contains the service overview for the CBDS supplementary-service part, a list of normative references, definitions and abbreviations, and the service list. It also includes Figure 1, which shows how the supplementary services are associated with the bearer services.

The two service definitions in Clause 6 are the core technical content: one for CUG and one for address screening. Annex A gives an informative bibliography, and the history box records the publication history of the edition.