ETSI ETS 300 402-1 ed.1 (1995-11)

Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T Recommendation Q.920 (1993), modified]

DE/SPS-05035-1

Digitalno omrežje z integriranimi storitvami (ISDN) - Protokol digitalne naročniške signalizacije št. 1 (DSS1) - Podatkovna povezovalna plast - 1. del: Splošne značilnosti (prilagojeno priporočilo ITU-T Q.921 (1993))

General Information

• Status: Published
• Publication Date: 20-Nov-1995
• Technical Committee: SPS 5 - Digital access signalling
• Current Stage: 12 - Completion
• Due Date: 01-Dec-1995
• Completion Date: 21-Nov-1995
• Mandate: T-234B
• Ref Project: SIST ETS 300 402-1:1996 - Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T Recommendation Q.920 (1993), modified]

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 402-1:1996
01-GHFHPEHU-1996
'LJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL,6'13URWRNROGLJLWDOQHQDURþQLãNH
VLJQDOL]DFLMHãW'663RGDWNRYQDSRYH]RYDOQDSODVWGHO6SORãQH
]QDþLOQRVWLSULODJRMHQRSULSRURþLOR,7874
Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one
(DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T Recommendation Q.920
(1993), modified]
Ta slovenski standard je istoveten z: ETS 300 402-1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
35.100.20 Podatkovni povezovalni sloj Data link layer
SIST ETS 300 402-1:1996 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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PSIST ETS 300 402-1:1996

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PSIST ETS 300 402-1:1996
EUROPEAN ETS 300 402-1
TELECOMMUNICATION November 1995
STANDARD
Source: ETSI TC-SPS Reference: DE/SPS-05035-1
ICS: 33.080, 35.100.20
ISDN, DSS1, layer 2, D-channel, LAPD, SSIG, QSIG
Key words:
Integrated Services Digital Network (ISDN);
Digital Subscriber Signalling System No. one (DSS1) protocol;
Data link layer;
Part 1: General aspects
[ITU-T Recommendation Q.920 (1993), modified]
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
*
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.

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PSIST ETS 300 402-1:1996
Page 2
ETS 300 402-1: November 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS is an updated version of ETS 300 125 Part 1. In addition, it was enhanced to cover service
aspects of the data link layer protocol for inter-exchange signalling between Private Telecommunication
Network eXchanges (PTNXs) in Private Telecommunication Networks (PTNs). Annex ZB identifies the
technical differences between this ETS and ETS 300 125 Part 1.
This ETS is part 1 of a multi-part standard covering the Integrated Services Digital Network (ISDN) Digital
Subscriber Signalling System No. one (DSS1) data link layer specification as described below:
Part 1: "General aspects [ITU-T Recommendation Q.920 (1993), modified]";
Part 2: "General protocol specification [ITU-T Recommendation Q.921 (1993), modified]";
Part 3: "Frame relay protocol specification";
Part 4: "Protocol Implementation Conformance Statement (PICS) proforma specification for the
general protocol";
Part 5: "PICS proforma specification for the frame relay protocol";
Part 6: "Test Suite Structure and Test Purposes (TSS&TP) specification for the general protocol";
Part 7: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the general protocol".
Transposition dates
Date of adoption of this ETS: 10 November 1995
Date of latest announcement of this ETS (doa): 28 February 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1996
Date of withdrawal of any conflicting National Standard (dow): 31 August 1996
Endorsement notice
The text of ITU-T Recommendation Q.920 (1993) was approved by ETSI as an ETS with agreed
modifications as given below.
NOTE: New or modified text is indicated using sidebars. In addition, underlining and/or strike-
out are used to highlight detailed modifications where necessary.
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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PSIST ETS 300 402-1:1996
Page 3
ETS 300 402-1: November 1995
Page 1
Add the following four clauses (Scope, Normative references, Definitions, Abbreviations) at the start of the
text:
Scope
This European Telecommunication Standard (ETS) describes in general terms the link access procedure
of the Digital Subscriber Signalling System No. one (DSS1) protocol when used in the pan-European
Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators, or in a Private Telecommunication Network (PTN), at the T reference point or the S reference
point or the coincident S and T reference point (as defined in ITU-T Recommendation I.411 [21]).
Annex ZA of this ETS describes in general terms the link access procedure for use in a symmetrical
application between two Private Telecommunication Network eXchanges (PTNXs) at the Q reference
point (see ETS 300 475-1 [20]).
Conformance to this ETS is met by conforming to the specific protocol standards for individual
applications. Therefore, no separate method of testing is provided for this ETS.
The field of application of this ETS is determined by specific protocol standards for individual applications.
Normative references
This ETS incorporates by dated and undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[14] ETS 300 011 (1990): "Integrated Services Digital Network (ISDN); Primary rate
user-network interface layer 1 specification and test principles".
[15] ETS 300 012 (1990): "Integrated Services Digital Network (ISDN); Basic user-
network interface layer 1 specification and test principles".
[16] ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Data link layer; Part 2: General
protocol specification [ITU-T Recommendation Q.921 (1993), modified]".
[17] ETS 300 402-3: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Data link layer; Part 3: Frame relay
protocol specification".
[18] ETS 300 403-1: "Integrated Services Digital Network (ISDN); Digital Subscriber
Signalling System No. one (DSS1) protocol; Signalling network layer for circuit-
mode basic call control; Part 1: Protocol specification [ITU-T Recommendation
Q.931 (1993), modified]".
[19] ETS 300 415 (1995): "Private Telecommunication Network (PTN); Terms and
definitions".
[20] ETS 300 475-1: "Private Telecommunication Network (PTN); Reference
configuration; Part 1: Reference configuration for PTN eXchanges (PTNX)
[ISO/IEC 11579-1 (1994), modified]".
[21] ITU-T Recommendation I.411 (1993): "ISDN user network interfaces - reference
configurations".
NOTE: The references listed in this ETS are a continuation of publications referenced in ITU-T
Recommendation Q.920.

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PSIST ETS 300 402-1:1996
Page 4
ETS 300 402-1: November 1995
Definitions
For the purposes of this ETS, the following definitions apply, together with those given in the referenced
publications:
Assignment Source Point (ASP): Layer management entity at the network side performing TEI
management.
automatic TEI assignment: Layer management procedure between user side and network side (ASP)
which associates within one interface a unique numeric value for a layer 2 terminal identity (TEI value) to a
variable called TEI of a specific terminal equipment. The TEI, which is part of the DLCI, is selected by the
ASP.
broadcast data link connection; broadcast connection: A connection with the capability to support
more than two connection-endpoints (see [X.200 § 5.3.1.4] multi-endpoint-connection).
confirm (primitive): [X.210 § 3.2.7] A primitive issued by a service-provider to complete, at a particular
service-access-point, some procedure previously invoked by a request at that service-access-point.
confirmed service: [X.210 § 3.2.12] A service which results in an explicit confirmation from the service-
provider. There is not necessarily any relationship to a response from the peer service user.
connection: [X.200 § 5.3.1.2] An association established by the "service provider" layer between two or
more "service user" entities for the transfer of data.
connection-endpoint: [X.200 § 5.3.1.3] A terminator at one end of a connection within a service-access-
point.
Connection Endpoint Identifier (CEI): [X.200 § 5.4.1.5] An identifier of a connection-endpoint which can
be used to identify the corresponding connection at a service-access-point.
Connection Endpoint Suffix (CES): [X.200 § 5.4.1.6] A part of a connection-endpoint-identifier which is
unique within the scope of a service-access-point.
Connection Management Entity (CME): An entity for the purpose of management of resources that
have impact on an individual data link connection.
D-channel: [I.412] The D-channel represents the portion of the information-carrying capacity of the ISDN
user-network interface primarily intended to carry access signalling information. In addition, a D-channel
may also be used to carry other information such as packet-switched data, teleaction information, etc.
data link connection: [X.212] An association established by a data link layer between two or more data
link service users for the transfer of data, which provides explicit identification of a set of data link data
transmissions and agreement concerning the data link transmission services to be provided for the set.
NOTE: This definition clarifies the definition given in CCITT Recommendation X.200.
Data Link Connection Identifier (DLCI): An address conveyed in a PDU which indicates the source and
destination of an intended instance of communication at the data link layer.
function: [X.200 § 5.2.1.7] A part of the activity of entities.
indication (primitive): [X.210 § 3.2.5] A primitive issued by a service-provider either:
a) to invoke some procedure; or
b) to indicate that a procedure has been invoked by the service-user at the peer service-access-
point.

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PSIST ETS 300 402-1:1996
Page 5
ETS 300 402-1: November 1995
interface-control-information: [X.200] Information transferred between a "service user" entity and a
"service provider" entity to co-ordinate their joint operation.
interface-data: [X.200] Information transferred from a "service user" entity to a "service provider" entity
for transmission to a correspondent "service user" entity over a connection, or conversely, information
transferred from a "service provider" entity to a "service user" entity after being received over a connection
from a correspondent "service user" entity.
Interface Data Unit (IDU): [X.200] The unit of information transferred across a service-access-point
between a "service user" entity and a "service provider" entity in a single interaction. Each interface-data-
unit contains interface-control-information and may also contain the whole or part of a service-data-unit.
Integrated Services Digital Network (ISDN): [I.112 § 2.3 definition 308] A network that provides or
supports a range of different telecommunication services and provides digital connections between user-
network interfaces.
layer: [X.200 § 5.2.1.2] A subdivision of the system architecture, constituted by subsystems of the same
rank.
layer management: [X.200 § 8.1.6] Functions related to the management of the layer partly performed in
the layer itself according to the protocol of the layer (activities such as activation and error control) and
partly performed as a subset of systems management.
Layer Management Entity (LME): An entity for the purpose of management of resources that have layer-
wide impact.
Link Access Procedure (LAP): Class of a procedure based on HDLC elements of procedures for use on
the link layer.
(N)-entity: [X.200 § 5.2.1.11] An active element within a (N)-subsystem.
(N)-subsystem: [X.200 § 5.2.1.1] An element in a hierarchical division of an open system which interacts
directly only with elements in the next higher division or the next lower division of that open system.
network side: Location in relation to the user-network interface indicating that the context to which this
term refers is at the network side of the user-network interface.
network side system management entity: An entity for the purpose of management communications at
the network side of the user-network interface.
non-automatic TEI assignment: Layer management local interaction between layer management entity
and data link layer entity at the user side which associates within one interface a numeric value for a
layer 2 terminal identity (TEI value) to a variable called TEI of a specific terminal equipment. The TEI,
which is part of the DLCI, is selected
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Integrated Services Digital Network (ISDN); Digital Subscriber Signalling System No. one (DSS1) protocol; Data link layer; Part 1: General aspects [ITU-T Recommendation Q.920 (1993), modified]35.100.20Podatkovni povezovalni slojData link layer33.080Digitalno omrežje z integriranimi storitvami (ISDN)Integrated Services Digital Network (ISDN)ICS:Ta slovenski standard je istoveten z:ETS 300 402-1 Edition 1PSIST ETS 300 402-1:1996en01-oktober-1996PSIST ETS 300 402-1:1996SLOVENSKI
STANDARD



PSIST ETS 300 402-1:1996



EUROPEANETS 300 402-1TELECOMMUNICATIONNovember 1995STANDARDSource: ETSI TC-SPSReference: DE/SPS-05035-1ICS:33.080, 35.100.20Key words:ISDN, DSS1, layer 2, D-channel, LAPD, SSIG, QSIGIntegrated Services Digital Network (ISDN);Digital Subscriber Signalling System No. one (DSS1) protocol;Data link layer;Part 1: General aspects[ITU-T Recommendation Q.920 (1993), modified]ETSIEuropean Telecommunications Standards InstituteETSI SecretariatPostal address: F-06921 Sophia Antipolis CEDEX - FRANCEOffice address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCEX.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail].: [phone] - Fax: [phone]Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and theforegoing restriction extend to reproduction in all media.© European Telecommunications Standards Institute 1995. All rights reserved.PSIST ETS 300 402-1:1996



Page 2ETS 300 402-1: November 1995ForewordThis European Telecommunication Standard (ETS) has been produced by the Signalling Protocols andSwitching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).This ETS is an updated version of ETS 300 125 Part 1. In addition, it was enhanced to cover serviceaspects of the data link layer protocol for inter-exchange signalling between Private TelecommunicationNetwork eXchanges (PTNXs) in Private Telecommunication Networks (PTNs). Annex ZB identifies thetechnical differences between this ETS and ETS 300 125 Part 1.This ETS is part 1 of a multi-part standard covering the Integrated Services Digital Network (ISDN) DigitalSubscriber Signalling System No. one (DSS1) data link layer specification as described below:Part 1:"General aspects [ITU-T Recommendation Q.920 (1993), modified]";Part 2:"General protocol specification [ITU-T Recommendation Q.921 (1993), modified]";Part 3:"Frame relay protocol specification";Part 4:"Protocol Implementation Conformance Statement (PICS) proforma specification for thegeneral protocol";Part 5:"PICS proforma specification for the frame relay protocol";Part 6:"Test Suite Structure and Test Purposes (TSS&TP) specification for the general protocol";Part 7:"Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing(PIXIT) proforma specification for the general protocol".Transposition datesDate of adoption of this ETS:10 November 1995Date of latest announcement of this ETS (doa):28 February 1996Date of latest publication of new National Standardor endorsement of this ETS (dop/e):31 August 1996Date of withdrawal of any conflicting National Standard (dow):31 August 1996Endorsement noticeThe text of ITU-T Recommendation Q.920 (1993) was approved by ETSI as an ETS with agreedmodifications as given below.NOTE:New or modified text is indicated using sidebars. In addition, underlining and/or strike-out are used to highlight detailed modifications where necessary.Whilst every care has been taken in the preparation and publication of this document, errors in content,typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to"ETSI Editing and Committee Support Dept." at the address shown on the title page.PSIST ETS 300 402-1:1996



Page 3ETS 300 402-1: November 1995Page 1Add the following four clauses (Scope, Normative references, Definitions, Abbreviations) at the start of thetext:ScopeThis European Telecommunication Standard (ETS) describes in general terms the link access procedureof the Digital Subscriber Signalling System No. one (DSS1) protocol when used in the pan-EuropeanIntegrated Services Digital Network (ISDN) as provided by European public telecommunicationsoperators, or in a Private Telecommunication Network (PTN), at the T reference point or the S referencepoint or the coincident S and T reference point (as defined in ITU-T Recommendation I.411 [21]).Annex ZA of this ETS describes in general terms the link access procedure for use in a symmetricalapplication between two Private Telecommunication Network eXchanges (PTNXs) at the Q referencepoint (see ETS 300 475-1 [20]).Conformance to this ETS is met by conforming to the specific protocol standards for individualapplications. Therefore, no separate method of testing is provided for this ETS.The field of application of this ETS is determined by specific protocol standards for individual applications.Normative referencesThis ETS incorporates by dated and undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this ETS only when incorporated in it by amendment or revision. For undated references the latestedition of the publication referred to applies.[14]ETS 300 011 (1990): "Integrated Services Digital Network (ISDN); Primary rateuser-network interface layer 1 specification and test principles".[15]ETS 300 012 (1990): "Integrated Services Digital Network (ISDN); Basic user-network interface layer 1 specification and test principles".[16]ETS 300 402-2: "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Data link layer; Part 2: Generalprotocol specification [ITU-T Recommendation Q.921 (1993), modified]".[17]ETS 300 402-3: "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Data link layer; Part 3: Frame relayprotocol specification".[18]ETS 300 403-1: "Integrated Services Digital Network (ISDN); Digital SubscriberSignalling System No. one (DSS1) protocol; Signalling network layer for circuit-mode basic call control; Part 1: Protocol specification [ITU-T RecommendationQ.931 (1993), modified]".[19]ETS 300 415 (1995): "Private Telecommunication Network (PTN); Terms anddefinitions".[20]ETS 300 475-1: "Private Telecommunication Network (PTN); Referenceconfiguration; Part 1: Reference configuration for PTN eXchanges (PTNX)[ISO/IEC 11579-1 (1994), modified]".[21]ITU-T Recommendation I.411 (1993): "ISDN user network interfaces - referenceconfigurations".NOTE:The references listed in this ETS are a continuation of publications referenced in ITU-TRecommendation Q.920.PSIST ETS 300 402-1:1996



Page 4ETS 300 402-1: November 1995DefinitionsFor the purposes of this ETS, the following definitions apply, together with those given in the referencedpublications:Assignment Source Point (ASP): Layer management entity at the network side performing TEImanagement.automatic TEI assignment: Layer management procedure between user side and network side (ASP)which associates within one interface a unique numeric value for a layer 2 terminal identity (TEI value) to avariable called TEI of a specific terminal equipment. The TEI, which is part of the DLCI, is selected by theASP.broadcast data link connection; broadcast connection: A connection with the capability to supportmore than two connection-endpoints (see [X.200 § 5.3.1.4] multi-endpoint-connection).confirm (primitive): [X.210 § 3.2.7] A primitive issued by a service-provider to complete, at a particularservice-access-point, some procedure previously invoked by a request at that service-access-point.confirmed service: [X.210 § 3.2.12] A service which results in an explicit confirmation from the service-provider. There is not necessarily any relationship to a response from the peer service user.connection: [X.200 § 5.3.1.2] An association established by the "service provider" layer between two ormore "service user" entities for the transfer of data.connection-endpoint: [X.200 § 5.3.1.3] A terminator at one end of a connection within a service-access-point.Connection Endpoint Identifier (CEI): [X.200 § 5.4.1.5] An identifier of a connection-endpoint which canbe used to identify the corresponding connection at a service-access-point.Connection Endpoint Suffix (CES): [X.200 § 5.4.1.6] A part of a connection-endpoint-identifier which isunique within the scope of a service-access-point.Connection Management Entity (CME): An entity for the purpose of management of resources thathave impact on an individual data link connection.D-channel: [I.412] The D-channel represents the portion of the information-carrying capacity of the ISDNuser-network interface primarily intended to carry access signalling information. In addition, a D-channelmay also be used to carry other information such as packet-switched data, teleaction information, etc.data link connection: [X.212] An association established by a data link layer between two or more datalink service users for the transfer of data, which provides explicit identification of a set of data link datatransmissions and agreement concerning the data link transmission services to be provided for the set.NOTE:This definition clarifies the definition given in CCITT Recommendation X.200.Data Link Connection Identifier (DLCI): An address conveyed in a PDU which indicates the source anddestination of an intended instance of communication at the data link layer.function: [X.200 § 5.2.1.7] A part of the activity of entities.indication (primitive): [X.210 § 3.2.5] A primitive issued by a service-provider either:a)to invoke some procedure; orb)to indicate that a procedure has been invoked by the service-user at the peer service-access-point.PSIST ETS 300 402-1:1996



Page 5ETS 300 402-1: November 1995interface-control-information: [X.200] Information transferred between a "service user" entity and a"service provider" entity to co-ordinate their joint operation.interface-data: [X.200] Information transferred from a "service user" entity to a "service provider" entityfor transmission to a correspondent "service user" entity over a connection, or conversely, informationtransferred from a "service provider" entity to a "service user" entity after being received over a connectionfrom a correspondent "service user" entity.Interface Data Unit (IDU): [X.200] The unit of information transferred across a service-access-pointbetween a "service user" entity and a "service provider" entity in a single interaction. Each interface-data-unit contains interface-control-information and may also contain the whole or part of a service-data-unit.Integrated Services Digital Network (ISDN): [I.112 § 2.3 definition 308] A network that provides orsupports a range of different telecommunication services and provides digital connections between user-network interfaces.layer: [X.200 § 5.2.1.2] A subdivision of the system architecture, constituted by subsystems of the samerank.layer management: [X.200 § 8.1.6] Functions related to the management of the layer partly performed inthe layer itself according to the protocol of the layer (activities such as activation and error control) andpartly performed as a subset of systems management.Layer Management Entity (LME): An entity for the purpose of management of resources that have layer-wide impact.Link Access Procedure (LAP): Class of a procedure based on HDLC elements of procedures for use onthe link layer.(N)-entity: [X.200 § 5.2.1.11] An active element within a (N)-subsystem.(N)-subsystem: [X.200 § 5.2.1.1] An element in a hierarchical division of an open system which interactsdirectly only with elements in the next higher division or the next lower division of that open system.network side: Location in relation to the user-network interface indicating that the context to which thisterm refers is at the network side of the user-network interface.network side system management entity: An entity for the purpose of management communications atthe network side of the user-network interface.non-automatic TEI assignment: Layer management local interaction between layer management entityand data link layer entity at the user side which associates within one interface a numeric value for alayer 2 terminal identity (TEI value) to a variable called TEI of a specific terminal equipment. The TEI,which is part of the DLCI
...