SIST ETS 300 486-1:1998

SIST ETS 300 486-1:1998 is a standard for the Broadband Integrated Services Digital Network (B-ISDN) meta-signalling protocol at the User-Network Interface (UNI). It specifies the protocol and procedures used to establish, maintain, and release signalling virtual channels so that B-ISDN terminal equipment can have signalling channels allocated by the network. The document is Part 1 and is based on ITU-T Recommendation Q.2120 (1995), with agreed modifications.

What does SIST ETS 300 486-1:1998 specify?

SIST ETS 300 486-1:1998 specifies the B-ISDN meta-signalling protocol and procedures for the pan-European B-ISDN when provided at the TB reference point or at coincident SB or TB reference points. In practice, this is the control step that lets terminal equipment set up the signalling path before normal signalling can begin.

The scope is focused on the UNI. The meta-signalling procedure is used to establish, maintain, and release signalling virtual channels, and it is intended for B-ISDN terminal equipment on a multiple access UNI where the network assigns signalling channels.

The document is organized as Part 1 of a multi-part standard. The foreword states that later parts may cover the Protocol Implementation Conformance Statement (PICS) proforma and conformance testing.

What are the key requirements of SIST ETS 300 486-1:1998?

SIST ETS 300 486-1:1998 is mainly about how the network and terminal equipment coordinate the creation of signalling capacity at the UNI. The key points are the scope of use, the triggering of meta-signalling, and the later creation of the signalling protocol stack.

Main technical points

• Applies at specific reference points - The ETS applies at the TB reference point or at coincident SB or TB reference points, as defined in ITU-T Recommendation I.413. For implementers, this fixes where the protocol is meant to operate in the access interface.

• Supports signalling channel allocation on multiple access UNI - B-ISDN terminal equipment uses meta-signalling so the network can allocate signalling channels. In practice, equipment must be able to invoke the procedure before ordinary signalling services can be set up.

• Covers establish, maintain, and release actions - The protocol and procedures define how signalling virtual channels are created, kept active, and cleared. This matters for lifecycle control, not just initial setup.

• Enables the signalling protocol stack to start - Once signalling channels have been allocated, the signalling protocol stack can be created and signalling can proceed. This tells designers that meta-signalling sits below normal signalling in the setup sequence.

• Uses normative annexes A, B, and C - Annexes A, B, and C have normative status. Anything in those annexes is part of the standard’s technical content and needs to be treated as required material.

• Based on an ITU-T recommendation with ETSI modifications - The text approves ITU-T Recommendation Q.2120 (1995) with agreed modifications. Implementers should follow the ETSI version, not the ITU-T text alone.

• Marks modified text clearly - New or modified text is shown with sidebars, underlining, and strike-out where needed. This helps readers and reviewers identify the parts that differ from the base recommendation.

What terms does SIST ETS 300 486-1:1998 define?

SIST ETS 300 486-1:1998 uses several core terms that frame where and how the protocol works.

• B-ISDN - Broadband Integrated Services Digital Network, the network environment addressed by the standard.
• UNI - User-Network Interface, the boundary where terminal equipment interacts with the network.
• Signalling virtual channels - The channels used to carry signalling traffic before normal call or connection control can run.
• Meta-signalling protocol - The control procedure used to assign those signalling channels at the UNI.
• TB reference point - A named interface point where the standard applies, as referenced to ITU-T Recommendation I.413.
• SB reference point - Another named interface point mentioned with TB in the scope statement.
• PICS - Protocol Implementation Conformance Statement, identified in the foreword as a possible subject for a later part.

Who uses SIST ETS 300 486-1:1998?

SIST ETS 300 486-1:1998 is used by telecom equipment designers, network engineers, and conformance teams working on B-ISDN access and signalling. It is relevant wherever terminal equipment must request signalling channel assignment at the UNI.

It also matters to quality managers and buyers evaluating B-ISDN interoperable equipment, because it tells them whether a product supports the required signalling setup sequence. Test teams can use it as the basis for later PICS and conformance work.

What changed in SIST ETS 300 486-1:1998 from the previous edition?

SIST ETS 300 486-1:1998 adopts ITU-T Recommendation Q.2120 (1995) with agreed modifications. The foreword says that new or modified text is marked with sidebars, underlining, and strike-out, and that Annex D does not form part of the ETS.

Which standards are used with SIST ETS 300 486-1:1998?

• ITU-T Recommendation Q.2120 (1995) - The base recommendation that this ETS modifies and endorses.
• ITU-T Recommendation I.413 - Supplies the reference-point framework used in the scope, including the TB and SB reference points.

What does the SIST ETS 300 486-1:1998 document contain?

SIST ETS 300 486-1:1998 contains the protocol specification for B-ISDN meta-signalling and the procedures for setting up signalling virtual channels at the UNI. It also includes the foreword, the scope replacement in subclause 1.1, and the annex status statements.

The document identifies annexes A, B, and C as normative. It also carries publication and history information, including the approval and adoption timeline and the publication markings used to show modifications to the underlying ITU-T text.