SIST EN 300 436-1 V1.2.1:2005

• Abstract:

  Specification of a corrigendum to ETS 300 436-1 on order to reflect changes based on the work for TSS&TP and ITU-T implementors' guide for Q.2110.

• Status: Published
• Publication Date: 31-Dec-2004
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2005
• Due Date: 01-Jan-2005
• Completion Date: 01-Jan-2005
• Ref Project: ETSI EN 300 436-1 V1.2.1 (2000-05) - Broadband Integrated Services Digital Network (B-ISDN); Signalling ATM Adaptation Layer (SAAL); Service Specific Connection Oriented Protocol (SSCOP); Part 1: Protocol specification [ITU-T Recommendation Q.2110, modified]

SIST EN 300 436-1 V1.2.1:2005 is the Slovenian standard identical to EN 300 436-1 Version 1.2.1 for Broadband Integrated Services Digital Network (B-ISDN) signalling. It specifies the Service Specific Connection Oriented Protocol (SSCOP) within the Signalling ATM Adaptation Layer (SAAL), as a modified version of ITU-T Recommendation Q.2110.

This document is a corrigendum to ETS 300 436-1, updating the protocol text to reflect work on TSS&TP and the ITU-T implementors' guide for Q.2110.

What does SIST EN 300 436-1 V1.2.1:2005 specify?

SIST EN 300 436-1 V1.2.1:2005 specifies SSCOP for the pan-European B-ISDN environment used by European public telecommunications operators. It covers the peer-to-peer transfer of information between SSCOP entities and the interactions between SSCOP and the ATM Adaptation Layer (AAL) common part and management plane.

The document is organized as a short endorsement of ITU-T Q.2110 plus the standard’s own front matter. Its main parts are Clause 1 Scope, Clause 2 References, Clause 3 Abbreviations, and Clause 4 Endorsement notice, followed by Annex A, a deleted Annex B, and informative Appendices I to IV.

Annex / appendix	What it covers
Annex A	Normative annex
Annex B	Deleted and replaced by ETS 300 436-2
Appendix I	Informative appendix
Appendix II	Informative appendix
Appendix III	Informative appendix
Appendix IV	Informative appendix

What are the key requirements of SIST EN 300 436-1 V1.2.1:2005?

The key requirements are the modifications applied to ITU-T Recommendation Q.2110. In practice, they adjust how SSCOP handles credit updates, polling, receiver variables, modulo comparisons, and the state machine used for connection control.

Credit updates and STAT PDU handling

Clause 7.1 adds an option for a STAT PDU to be sent whenever the receiver needs to update credit information. When this happens, N(PS) is taken from the last POLL PDU, and reception status information may be included or omitted. This matters because it gives implementers a defined way to refresh flow-control state without waiting for a poll response.

Receiver variables and IDLE-state behavior

Clause 7.4 adds two optional receiver state variables: VR(PS), the poll sequence number of the last POLL PDU received, and poll_received, an indication that at least one POLL has been received since connection establishment. The same clause also allows a BGN PDU in state 10 (IDLE) to be accepted regardless of N(SQ), as an implementation option. In practice, these changes affect how a receiver initializes state and how tolerant it can be to startup signaling.

Flow control and operating window guidance

Clause 7.8.1 adds guidance intended to avoid deadlock by bounding the transmitter operating window. It also gives two optional performance measures: send a POLL PDU after emptying the retransmission buffer, and let the receiver send a STAT PDU when an immediate credit update is useful. For implementers, this is the part that links protocol behavior to buffering and congestion handling.

State-machine and figure updates

Figure 20 is updated in several sheets to match the revised behavior for BGN PDU handling, modulo comparisons, STAT after gap closure, and the initialization routine. These changes define how the protocol moves between states and how variables such as VT(S), VT(PS), VR(R), VR(H), and Credit are initialized and updated. For testing and implementation, Figure 20 is the practical reference for expected protocol behavior.

Annex and reference changes

Annex A remains normative. Annex B is deleted and replaced by ETS 300 436-2, which shifts the conformance material into the separate PICS part. The reference list also points to modified ETSI versions of Q.2130, Q.2140, and Q.2931.

What terms does SIST EN 300 436-1 V1.2.1:2005 define?

The abbreviations in this standard follow those of ITU-T Recommendation Q.2110, with the ETSI document using several key terms throughout.

• B-ISDN - Broadband Integrated Services Digital Network, the network environment for which SSCOP is specified.
• SAAL - Signalling ATM Adaptation Layer, the layer that carries signalling traffic above ATM.
• SSCOP - Service Specific Connection Oriented Protocol, the protocol defined by this standard for reliable peer-to-peer signalling transfer.
• AAL - ATM Adaptation Layer, the layer whose common part and management plane interact with SSCOP.
• PDU - Protocol Data Unit, the protocol message type used by SSCOP such as POLL, STAT, and BGN PDUs.
• PICS - Protocol Implementation Conformance Statement, the conformance profile covered by the separate Part 2.

Who uses SIST EN 300 436-1 V1.2.1:2005?

SIST EN 300 436-1 V1.2.1:2005 is used by implementers of B-ISDN signalling equipment and software, especially those working with SSCOP and the AAL interfaces. It is also used by conformance test developers and laboratories because the foreword points to separate parts for PICS, TSS&TP, and ATS material.

European public telecommunications operators are the service context named in the scope, so the document is relevant to network-side deployment and interoperability work. Quality and verification teams use it to check whether an SSCOP implementation follows the modified Q.2110 behavior.

What changed in SIST EN 300 436-1 V1.2.1:2005 from the previous edition?

This publication is a corrigendum to ETS 300 436-1. It updates the protocol text to reflect the ITU-T Q.2110 implementors' guide and ETSI work on TSS&TP, and it revises specific parts of Clause 7, Figure 20, the reference list, and the annex structure.

The history shows an original Edition 1 from November 1995 and this V1.2.1 publication in September 2000. Annex B is removed and replaced by ETS 300 436-2.

Which standards are used with SIST EN 300 436-1 V1.2.1:2005?

The document relies on the references listed in Clause 2 and the related EN parts named in the foreword.

• ITU-T Recommendation Q.2110 - the base SSCOP specification that this EN modifies.
• ITU-T Recommendation Q.2130 as modified by ETS 300 437-1 - referenced for SSCF support at the User-Network Interface (UNI).
• ITU-T Recommendation Q.2140 as modified by ETS 300 438-1 - referenced for SSCF support at the Network Node Interface (NNI).
• ITU-T Recommendation Q.2931 as modified by ETS 300 443-1 - referenced for B-ISDN basic call/bearer control.
• ITU-T COM 11-R 67-E - the implementors' guide for Q.2110 that influenced this corrigendum.
• ETSI ETS 300 436-2 - the Part 2 PICS proforma specification that replaces deleted Annex B.
• ETSI ETS 300 437-1, ETS 300 438-1, ETS 300 443-1 - companion ENs that provide the modified supporting specifications.

What does the SIST EN 300 436-1 V1.2.1:2005 document contain?

The document contains the endorsement notice that imports ITU-T Q.2110 with ETSI modifications, plus the short scope, references, abbreviations, and the detailed modification notes. Those notes cover protocol behavior, state variables, flow control, modulo comparison rules, and updates to Figure 20.

It also contains the annex and appendix structure, with Annex A normative and Annex B deleted. The document history records the editions and publication steps. In practice, readers use these sections for implementation, conformance testing, and checking how the ETSI version differs from the original ITU-T text.

SLOVENSKI STANDARD
01-januar-2005
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Broadband Integrated Services Digital Network (B-ISDN); Signalling ATM Adaptation
Layer (SAAL); Service Specific Connection Oriented Protocol (SSCOP); Part 1: Protocol
specification [ITU-T Recommendation Q.2110, modified]
Ta slovenski standard je istoveten z: EN 300 436-1 Version 1.2.1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

ETSI EN 300 436-1 V1.2.1 (2000-09)
European Standard (Telecommunications series)
Broadband Integrated Services Digital Network (B-ISDN);
Signalling ATM Adaptation Layer (SAAL);
Service Specific Connection Oriented Protocol (SSCOP);
Part 1: Protocol specification
[ITU-T Recommendation Q.2110, modified]

2 ETSI EN 300 436-1 V1.2.1 (2000-09)
Reference
REN/SPAN-01058-1
Keywords
ATM, ISDN, SSCOP
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© European Telecommunications Standards Institute 2000.
All rights reserved.
ETSI
3 ETSI EN 300 436-1 V1.2.1 (2000-09)
Contents
Intellectual Property Rights.4
Foreword.4
Endorsement notice .4
1 Scope .5
2 References .5
3 Abbreviations .5
4 Endorsement notice.6
History .11
ETSI
4 ETSI EN 300 436-1 V1.2.1 (2000-09)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
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can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
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Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Services and
Protocols for Advanced Networks (SPAN).
The present document is part 1 of a multi-part EN covering the Broadband Integrated Services Digital Network
(B-ISDN); Signalling ATM Adaptation Layer (SAAL); Service Specific Connection Oriented Protocol (SSCOP), as
identified below:
Part 1: "Protocol specification [ITU-T Recommendation Q.2110, modified]";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user".
NOTE: Edition 1 of part 4, the abstract test suite, can only be used without an upper tester or with ETS 300 437-1
as an upper tester.
National transposition dates
Date of adoption of this EN: 21 July 2000
Date of latest announcement of this EN (doa): 31 October 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 April 2001
Date of withdrawal of any conflicting National Standard (dow): 30 April 2001
Endorsement notice
The elements of ITU-T Recommendations Q.2110 [15] apply, with the following modifications:
ETSI
5 ETSI EN 300 436-1 V1.2.1 (2000-09)
1 Scope
The present document specifies the Service Specific Connection Oriented Protocol (SSCOP) for the pan-European
Broadband Integrated Services Digital Network (B-ISDN) as provided by European public telecommunications
operators.
The present document specifies the peer-to-peer protocol for the transfer of information between any pair of SSCOP
entities, the interactions between the SSCOP and the ATM Adaptation Layer (AAL) common part, and the interactions
between the SSCOP and the AAL management plane.
Further parts of the present document specify the method of testing required to identify conformance to this EN.
The present document is applicable as defined in the appropriate Service Specific Co-ordination Function (SSCF).
2 References
Insert the following references at the end of clause 2 of ITU-T Recommendation Q.2110 [15]:
The references of ITU-T Recommendation Q.2110 [15] apply, modified as shown below.
Reference in ITU-T Recommendation Modified reference
Q.2110
ITU-T Recommendation Q.2130 [9] ITU-T Recommendation Q.2130 as modified by ETS 300 437-1 [11]
ITU-T Recommendation Q.2140 [10] ITU-T Recommendation Q.2140 as modified by ETS 300 438-1 [12]
ITU-T Recommendation Q.2931 [5] ITU-T Recommendation Q.2931 as modified by ETS 300 443-1 [13]
[11] ETSI ETS 300 437-1: "Broadband Integrated Services Digital Network (B-ISDN); Signalling
ATM Adaptation Layer (SAAL); Servic
...