ETSI EG 201 018 V1.5.2 (1998-11)

SLOVENSKI STANDARD
SIST-V ETSI/EG 201 018 V1.5.2:2005
01-april-2005
Digitalno omrežje z integriranimi storitvami (ISDN) - Uporaba informacijskih
elementov: nosilna zmožnost (BC), združljivost zgornjih plasti (HLC) in združljivost
spodnjih plasti (LLC) v terminalih, ki podpirajo storitve ISDN
Integrated Services Digital Network (ISDN); Application of the Bearer Capability (BC),
High Layer Compatibility (HLC) and Low Layer Compatibility (LLC) information elements
by terminals supporting ISDN services
Ta slovenski standard je istoveten z: EG 201 018 Version 1.5.2
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST-V ETSI/EG 201 018 V1.5.2:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-V ETSI/EG 201 018 V1.5.2:2005

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SIST-V ETSI/EG 201 018 V1.5.2:2005
EG 201 018 V1.5.2 (1998-11)
ETSI Guide
Integrated Services Digital Network (ISDN);
Application of the Bearer Capability (BC),
High Layer Compatibility (HLC) and
Low Layer Compatibility (LLC) information elements
by terminals supporting ISDN services

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SIST-V ETSI/EG 201 018 V1.5.2:2005
2 EG 201 018 V1.5.2 (1998-11)
Reference
REG/SPS-05207 (9fc00jpe.PDF)
Keywords
ISDN, DSS1, coding, BC, LLC, HLC, IE
ETSI
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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 1998.
All rights reserved.
ETSI

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SIST-V ETSI/EG 201 018 V1.5.2:2005
3 EG 201 018 V1.5.2 (1998-11)
Contents
Intellectual Property Rights.6
Foreword .6
Introduction .6
1 Scope.8
2 References.8
3 Abbreviations.9
4 General principles applicable to all services.10
5 Impact of interworking situations .11
5.1 Incoming calls from non-ISDNs . 11
5.2 BC and LLC application guidelines. 11
6 Request and recognition of a basic telecommunication service in an ISDN environment .12
6.1 Request and recognition of a circuit-mode bearer service . 12
6.1.1 Circuit-mode 64 kbit/s 8 kHz structured bearer service category usable for speech information
transfer . 12
6.1.1.1 Request by a calling terminal equipment . 12
6.1.1.2 Compatibility at the called terminal equipment . 12
6.1.2 Circuit-mode 64 kbit/s unrestricted 8 kHz structured bearer service category. 13
6.1.2.1 Request by a calling terminal equipment . 13
6.1.2.2 Compatibility at the called terminal equipment . 13
6.1.3 Circuit-mode 64 kbit/s 8 kHz structured bearer service category usable for 3,1 kHz audio
information transfer. 14
6.1.3.1 Request by a calling terminal equipment . 14
6.1.3.2 Compatibility at the called terminal equipment . 14
6.1.4 Circuit-mode multiple-rate unrestricted 8 kHz structured bearer service category . 15
6.1.4.1 Request by a calling terminal equipment . 15
6.1.4.2 Compatibility at the called terminal equipment . 15
6.2 Packet mode bearer service categories. 16
6.2.1 Virtual call bearer services (support of X.25 terminal equipment allowing access to the ISDN virtual
circuit service (ITU-T Recommendation X.31, Case B)). 16
6.2.1.1 Access through the B-channel . 16
6.2.1.1.1 Request by a calling terminal equipment . 16
6.2.1.1.2 Compatibility at the called terminal equipment. 16
6.2.1.2 Access through the D-channel . 17
6.2.1.2.1 Request by a calling terminal equipment . 17
6.2.1.2.2 Compatibility at the called terminal equipment. 17
6.3 Request and recognition of a teleservice. 17
6.3.1 Telephony 3,1 kHz teleservice . 17
6.3.1.1 Request by a calling terminal equipment . 17
6.3.1.2 Compatibility at the called terminal equipment . 18
6.3.2 Telefax G4 service (using circuit-mode bearer capability). 18
6.3.2.1 Request by a calling terminal equipment . 18
6.3.2.2 Compatibility at the called terminal equipment . 19
6.3.3 Syntax-based videotex teleservice. 21
6.3.3.1 Access to the syntax-based videotex teleservice using an end-to-end circuit-switched connection. 21
6.3.3.1.1 Request by a calling terminal equipment . 21
6.3.3.1.2 Compatibility at the called terminal equipment. 22
6.3.3.2 Access to the syntax-based videotex teleservice via a PSPDN access unit (ITU-T
Recommendation X.31, Case A) . 24
6.3.3.2.1 Request by a calling terminal equipment . 24
6.3.3.2.2 Compatibility at the called terminal equipment. 25
6.3.3.3 Access to the syntax-based videotex teleservice using a packet-switched connection through the
B-channel. 25
ETSI

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4 EG 201 018 V1.5.2 (1998-11)
6.3.3.3.1 Request by a calling terminal . 26
6.3.3.3.2 Compatibility at the called terminal equipment. 26
6.3.3.4 Access to the syntax-based videotex service using a packet-switched connection through the
D-channel . 26
6.3.3.4.1 Request by a calling terminal using the D-channel . 26
6.3.3.4.2 Compatibility at the called terminal equipment. 27
6.3.4 Telephony 7 kHz teleservice . 27
6.3.4.1 Request by a calling terminal equipment . 27
6.3.4.2 Compatibility at the called terminal equipment . 28
6.3.5 Videotelephony teleservice . 29
6.3.5.1 Codings required for the service specified in ETS 300 264 . 29
6.3.5.1.1 First connection. 29
6.3.5.1.2 Second connection . 31
6.3.5.2 Codings required for short term procedures . 32
6.3.5.2.1 Request by a calling terminal equipment . 32
6.3.5.2.2 Compatibility at the called terminal equipment. 33
6.3.6 Facsimile group 2/3 service. 34
6.3.6.1 Request by a calling terminal equipment . 34
6.3.6.2 Compatibility at the called terminal equipment . 35
6.3.7 File transfer & access management (FTAM) teleservice. 35
6.3.7.1 Request by a calling terminal equipment . 35
6.3.7.2 Compatibility at the called terminal equipment . 36
6.3.8 Euro file transfer teleservice. 37
6.3.8.1 Request by a calling terminal. 37
6.3.8.2 Compatibility at the called terminal equipment . 39
6.3.9 Videoconference teleservice. 40
6.3.9.1 Codings required for the service specified in ETS 300 267 . 40
6.3.9.1.1 First connection. 40
6.3.9.1.2 Second connection . 42
6.3.9.2 Codings required for short term procedures . 43
6.3.9.2.1 Request by a calling terminal equipment . 43
6.3.9.2.2 Compatibility at the called terminal equipment. 44
6.3.10 Audiographic conference teleservice. 45
6.3.10.1 Codings required for the service specified in ETS 300 267 . 45
6.3.10.1.1 First connection. 45
6.3.10.1.2 Second connection . 47
6.3.10.2 Codings required for short term procedures . 48
6.3.10.2.1 Request by a calling terminal equipment . 49
6.3.10.2.2 Compatibility at the called terminal equipment. 50
6.3.11 Multimedia services . 51
6.3.11.1 Codings required for the service specified in F.700 . 51
6.3.11.1.1 First connection. 51
6.3.11.1.2 Second connection . 53
6.3.11.2 Codings required for short term procedures . 54
6.3.11.2.1 Request by a calling terminal equipment . 54
6.3.11.2.2 Compatibility at the called terminal equipment. 55
7 Coding examples applicable to specific user applications.56
7.1 Specific user applications of the circuit-mode 64 kbit/s unrestricted 8 kHz structured bearer service . 56
7.1.1 Support of terminal adapters V.110/X.30 . 56
7.1.1.1 Synchronous mode of operation . 56
7.1.1.1.1 Request by a calling terminal equipment . 56
7.1.1.1.2 Compatibility at the called terminal equipment. 57
7.1.1.2 Asynchronous mode of operation . 58
7.1.1.2.1 Request by a calling terminal equipment . 58
7.1.1.2.2 Compatibility at the called terminal equipment. 59
7.1.2 Support of X.25 terminal equipment allowing access to PSPDN via an access unit (ITU-T
Recommendation X.31, Case A) . 61
7.1.2.1 Rate adaption using X.31 HDLC flag stuffing. 61
7.1.2.1.1 Request by a calling terminal equipment . 61
7.1.2.1.2 Compatibility at the called terminal equipment. 62
ETSI

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5 EG 201 018 V1.5.2 (1998-11)
7.1.2.2 Rate adaption corresponding to CCITT Recommendations V.110/X.30. 63
7.1.2.2.1 Request by a calling terminal equipment . 63
7.1.2.2.2 Compatibility at the called terminal equipment. 64
7.1.3 Support of teletex terminals using circuit-mode 64 kbit/s unrestricted 8 kHz-structured bearer
capability. 65
7.1.3.1 Request by a calling terminal equipment . 65
7.1.3.2 Compatibility at the called terminal equipment . 66
7.2 Specific user applications of the circuit mode 64 kbit/s 8 kHz structured bearer service category usable
for 3,1 kHz audio information transfer . 67
7.2.1 Voice band data via modem . 68
7.2.1.1 Request by a calling terminal equipment . 68
7.2.1.2 Compatibility at the called terminal equipment . 69
8 Interworking with non-European ISDNs supporting restricted 64 kbit/s transfer capability .70
8.1 Request by a calling terminal connected to a network supporting 64 kbit/s unrestricted digital
information transfer . 70
8.2 Compatibility at the called terminal equipment connected to a network supporting 64 kbit/s unrestricted
digital information transfer . 70
8.3 Request by a calling terminal connected to a non-European network supporting 64 kbit/s restricted
digital information transfer . 71
8.4 Compatibility at the called terminal equipment connected to a non-European network using restricted
digital information transfer . 71
9 Codings in the case where non-ISDNs are involved.72
9.1 Calls from PSTN to ISDN . 72
9.2 Calls from PSPDN to ISDN. 72
9.3 Calls from CSPDN to ISDN . 72
Annex A (informative): Bibliography.73
History.74
ETSI

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SIST-V ETSI/EG 201 018 V1.5.2:2005
6 EG 201 018 V1.5.2 (1998-11)
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 SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)
which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Guide (EG) has been produced by ETSI Technical Committee Signalling Protocols and Switching (SPS).
The present document replaces the fourth edition of ETR 018 issued in March 1995.
The following modifications have been made as compared to the fourth edition:
- examples of the use of the videoconferencing teleservice have been added (see subclause 6.3.9);
- examples of the use of the audiographic conferencing teleservice have been added (see subclause 6.3.10);
- examples of the use of multimedia services have been added (see subclause 6.3.11).
Further enhancements of the present document will (most likely) become necessary. Candidates for inclusion in a future
edition are e.g.:
- examples to document the user signalling bearer service;
- examples to document the teleaction teleservice;
- examples to support channel aggregation as an application of the 64 kbit/s unrestricted bearer service.
Introduction
The present document specifies the coding of the information elements Bearer Capability (BC), High Layer
Compatibility (HLC) and Low Layer Compatibility (LLC) to be used by terminals supporting the ISDN
telecommunication services so far specified within ETSI and operating in the demand mode. It is based on ITU-T
Recommendation Q.931 (1993) as modified by EN 300 403-1 [5], including its relevant annexes (B, I and J).
For each service it is specified which field values the calling user is requested to send and which field values the called
user could expect to receive in a pure ISDN environment (clauses 6 and 7). Clause 8 specifies the codings to be used in
the case of inter-working with non European ISDNs supporting restricted 64 kbit/s transfer capability. Furthermore,
interworking with the Public Switched Telephone Network (PSTN) is also covered (see subclause 9.1).
Unless otherwise stated, the use of the term "terminal" refers to customer's terminal apparatus which may be a Terminal
Equipment type 1 (TE1), a Terminal Adapter (TA) together with a Terminal Equipment type 2 (TE2) or a Network
Termination type 2 (NT2) as defined in ITU-T Recommendation I.411.
The terms "terminal" and "user" are used interchangeably.
ETSI

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The exact bit patterns correlated with the named field values can be found in the following subclauses of EN 300 403-
1 [5]:
- in subclause 4.5.5 for the bearer capability information element;
- in subclause 4.5.17 for the high layer compatibility information element; and
- in subclause 4.5.19 for the low layer compatibility information element.
Generally, the information elements BC, HLC and LLC serve the following purposes:
At the calling side, the network checks that the bearer service requested by the calling user in the bearer capability
information element matches with the bearer service provided to that user by the network (see EN 300 403-1 [5],
annex B).
At the called side, the called user performs network-to-user compatibility checking based on the content of the BC-
information element, and user-to-user compatibility checking based on the content of the HLC- and LLC- information
elements (see EN 300 403-1 [5], annex B).
ETSI

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SIST-V ETSI/EG 201 018 V1.5.2:2005
8 EG 201 018 V1.5.2 (1998-11)
1 Scope
The present document provides supplementary information on the usage of the compatibility information elements
Bearer Capability (BC), High Layer Compatibility (HLC) and Low Layer Compatibility (LLC) for individual
telecommunication services. It considers the telecommunications services as they are specified for public Integrated
Services Digital Networks (ISDNs). It does not specify additional codings of the compatibility information elements
which might be required to support the request and provision of telecommunication services by private networks.
Since some bearer services can be used to support various user applications, additional information on such applications
is specified:
- in subclause 7.1 for the circuit-mode 64 kbit/s unrestricted 8 kHz structured bearer service;
- in subclause 7.2 for the circuit-mode 64 kbit/s 8 kHz structured 3,1 kHz audio bearer service.
The specific objective of the present document is to provide guidance on the correct usage of EN 300 403-1 [5]
codepoints to the different ETSI Technical Committees or Technical Subcommittees dealing with services, ISDN
terminals, Terminal Adapters (TAs) and documents on testing. The present document shall help to assure inter-
operability of terminals supporting the same telecommunication service and shall enable terminals to operate on
different public ISDNs.
The typical codings specified in clause 6 should be supported by all users and networks supporting the corresponding
telecommunications service. Other variants of these codings may be supported in addition, however, these variants
might not provide for world-wide interoperability and might not guarantee terminal interchangeability.
The coding examples given in clause 7 are not exhaustive. They illustrate typical user applications involving bit rate
adaption schemes where ETSI standardized interfaces are used.
Clause 8 is devoted to examples showing the interworking of European ISDNs with non-European ISDNs supporting
restricted 64 kbit/s transfer capability.
Finally, clause 9 presents codings when interworking with non-ISDNs occurs.
2 References
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in
which case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case the latest version applies.
A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] ETS 300 080: "Integrated Services Digital Network (ISDN); ISDN lower layer protocols for
telematic terminals".
[2] ETS 300 103 (1990): "Integrated Services Digital Network (ISDN); Support of
CCITT Recommendation X.21, X.21 bis and X.20 bis based Data Terminal Equipments (DTEs) by
an ISDN; Synchronous and asynchronous terminal adaption functions".
[3] ETS 300 218 (1993): "Integrated Services Digital Network (ISDN); Syntax-based videotex lower
layers protocols for ISDN packet mode (CCITT Recommendation X.31 Case A and Case B)".
ETSI

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