SIST ETS 300 049 E2:2003

SLOVENSKI STANDARD
01-december-2003
Digitalno omrežje z integriranimi storitvami (ISDN) – Paketne nosilne storitve
(PMBS) – Nosilne storitve navideznega klica (VC) in stalnega navideznega voda
(PVC) v sistemu ISDN prek D-kanala uporabniškega dostopa, osnovne in primarne
Integrated Services Digital Network (ISDN); ISDN Packet Mode Bearer Service (PMBS);
ISDN Virtual Call (VC) and Permanent Virtual Circuit (PVC) bearer services provided by
the D-channel of the user access - basic and primary rate
Ta slovenski standard je istoveten z: ETS 300 049 Edition 2
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.

EUROPEAN ETS 300 049
TELECOMMUNICATION December 1997
STANDARD Second Edition
Source: NA Reference: RE/NA-025107
ICS: 33.020
Key words: basic, bearer, ISDN, packet mode, PMBS, primary, PVC, rate, service, VC
Integrated Services Digital Network (ISDN);
ISDN Packet Mode Bearer Service (PMBS);
ISDN Virtual Call (VC) and Permanent Virtual Circuit (PVC)
bearer services provided by the D-channel of the user access -
basic and primary rate
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
Tel.: +33 4 92 94 42 00 - Fax: +33 4 93 65 47 16
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 1997. All rights reserved.

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ETS 300 049: December 1997
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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Contents
Foreword .5
Introduction.5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Description .10
5 Procedures.10
5.1 Provision and withdrawal .10
5.1.1 General.10
5.1.2 Access method.11
5.1.2.1 Semi-permanent D-channel access .11
5.1.2.2 Preallocated logical link access.12
5.1.2.3 Long-duration preallocated logical link access .12
5.1.2.4 Switched D-channel access .12
5.1.2.5 Notification class.12
5.1.3 X.25 service profile.13
5.2 Access connection procedures.13
5.2.1 Semi-permanent D-channel access.13
5.2.1.1 Establishment .13
5.2.1.2 Release.13
5.2.2 Preallocated logical link access.13
5.2.2.1 Establishment .14
5.2.2.2 Release.14
5.2.3 Long-duration preallocated logical link access.14
5.2.3.1 Establishment .14
5.2.3.2 Release.14
5.2.4 Switched D-channel access .14
5.2.4.1 Establishment .14
5.2.4.2 Release.15
5.2.5 Summary of access connection procedures .15
5.3 Normal procedures .15
5.3.1 Activation, deactivation and registration.15
5.3.2 Invocation and operation .15
5.3.2.1 Virtual call procedures .15
5.3.2.1.1 Access connection establishment.15
5.3.2.1.2 Terminal selection and identification.16
5.3.2.1.3 Call establishment .16
5.3.2.1.4 Data transfer .16
5.3.2.1.5 Call Release.16
5.3.2.1.6 Access connection release.16
5.3.2.2 Permanent virtual circuit procedures.17
5.3.2.2.1 Access connection establishment.17
5.3.2.2.2 Terminal selection/identification.17
5.3.2.2.3 Call establishment .17
5.3.2.2.4 Data transfer .17
5.3.2.2.5 Call release.17
5.3.2.2.6 Access connection release.17
5.3.3 Interrogation and editing.17
5.4 Exceptional procedures .17

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5.4.1 Activation, deactivation and registration . 17
5.4.2 Invocation and operation . 17
5.4.2.1 Invalid invocation. 17
5.4.2.2 Virtual call. 17
5.4.2.3 Permanent virtual circuit . 18
5.4.3 Interrogation and editing . 18
6 Network capabilities for charging. 18
7 Interworking . 18
7.1 Interworking between public networks . 18
7.2 Interworking between private and public ISDNs. 18
7.2.1 Interworking via D-channels . 18
7.2.1.1 Private ISDN providing own PH function. 18
7.2.1.2 Private ISDN providing own FH function. 19
7.2.2 Interworking via B-channels. 19
8 Interaction with supplementary services. 20
9 Attributes and values of attributes (including the provision of individual bearer services). 20
9.1 Attributes/values. 20
9.2 Provision of individual bearer services. 21
Annex A (normative): Standard service profile for PMBS-D. 23
Annex B (normative): User facilities. 24
Annex C (informative): Default service profile for PMBS-D . 27
Annex D (informative): Transition schemes for addressing and numbering. 28
History. 29

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
Annexes A and B are normative, annexes C and D are informative.
Transposition dates
Date of adoption: 19 December 1997
Date of latest announcement of this ETS (doa): 31 March 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 1998
Date of withdrawal of any conflicting National Standard (dow): 30 September 1998
Introduction
In accordance with CCITT Recommendation I.130 [13], the following three level structure is used to
describe the supplementary telecommunication services as provided by European public
telecommunications operators under the pan-European Integrated Services Digital Network (ISDN):
- stage 1: is an overall service description, from the user's stand-point;
- stage 2: identifies the functional capabilities and information flows needed to support the service
described in stage 1; and
- stage 3: defines the signalling system protocols and switching functions needed to implement the
service described in stage 1.
This ETS describes the stage one requirements of the ISDN Packet Mode Bearer Services (PMBS)
provided on the D-channel of the user access. Services using the B-channel are covered in
ETS 300 048 [4].
The requirements described in this ETS are applicable only to those services within Europe, and are
based on ITU-T Recommendation I.232 [17]. This service description corresponds to case B (D-channel)
of ETS 300 007 [1] (the European equivalent to ITU-T Recommendation X.31 [11]).
The requirements for stage three of these services are contained in ETS 300 007 [1].

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1 Scope
This European Telecommunication Standard (ETS) defines stage one of the ISDN Packet Mode Bearer
Service (PMBS) provided on the D-channel of the user access for the pan-European Integrated Services
Digital Network (ISDN) as provided by European public telecommunications operators. Stage one is an
overall service description from the user's point of view (see CCITT Recommendation I.130 [13]), but
does not deal with the details of the human interface itself.
This ETS makes use of ETS 300 007 [1], which is a stage three standard, in order to provide a description
of the procedures. This mechanism would not normally be used in a stage one standard.
In addition, this ETS specifies the base functionality where the service is provided to the user via a private
ISDN.
This ETS does not define details of the interworking requirements of private ISDNs with the public ISDN.
This ETS does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN but does include interworking requirements of other
networks with the public ISDN.
Charging principles are outside the scope of this ETS.
The ISDN Virtual Call (VC) and Permanent Virtual Circuit (PVC) bearer service category provides the
unrestricted transfer (without alteration) of user information in a packetized manner over a virtual circuit
between reference points via the basic and primary rate access. Each of the reference points can be
either an S or coincident S and T reference point.
NOTE: Network operators can also provide information transfer with the same attributes
where the reference point is T.
The ISDN VC and PVC bearer service category is described in ITU-T Recommendation I.232 [17].
This ETS is applicable to the stage three standards for the ISDN PMBS. The term "stage three" is also
defined in CCITT Recommendation I.130 [13]. Where the text indicates the status of a requirement (i.e. as
strict command or prohibition, as authorization leaving freedom, or as a capability or possibility), this shall
be reflected in the text of the relevant stage three standards.
Furthermore, conformance to this ETS is met by conforming to the stage three standards with the field of
application appropriate to the equipment being implemented. Therefore no method of testing is provided
for this ETS.
2 Normative references
This ETS incorporates by dated or 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.
[1] ETS 300 007 (1991): "Integrated Services Digital Network (ISDN); Support of
packet-mode terminal equipment by an ISDN".
[2] ETS 300 011 (1992): "Integrated Services Digital Network (ISDN): Primary rate
user-network interface - Layer 1 specification and test principles".
[3] ETS 300 012 (1992): "Integrated Services Digital Network (ISDN): Basic user-
network interface - Layer 1 specification and test principles".
[4] ETS 300 048 (1992): "Integrated Services Digital Network (ISDN); ISDN Packet
Mode Bearer Services (PMBS); ISDN Virtual Call (VC) and Permanent Virtual
Circuit (PVC) bearer services provided by the B-channel of the user access -
basic and primary rate".
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[5] ETS 300 099: "Integrated Services Digital Network (ISDN); Specification of the
Packet Handler access point Interface (PHI)".
[6] ETS 300 402-2 (1995): "Integrated Services Digital Network (ISDN); Digital
Subscriber Signalling System No. one (DSS1); User-network interface data link
layer; Part 2: General application protocol
specification [ITU-T Recommendation Q.921 (1993), modified] ".
[7] ETS 300 403-1 (1995): "Integrated Services Digital Network (ISDN); Digital
Subscriber Signalling System No. one (DSS1); User-network interface layer 3
specification for basic call control; Part 1: Protocol
specification [ITU-T Recommendation Q.931 (1993), modified]".
[8] ITU-T Recommendation X.1 (1993): "International user classes of service in,
and categories of access to, public data networks and Integrated Service Digital
Networks (ISDNs)".
[9] ITU-T Recommendation X.2 (1993): "International data transmission services
and optional user facilities in public data networks and ISDNs".
[10] ITU-T Recommendation X.25 (1993): "Interface between Data Terminal
Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals
operating in the packet mode and connected to public data networks by
dedicated circuit".
[11] ITU-T Recommendation X.31 (1993): "Support of packet mode terminal
equipment by an ISDN".
[12] ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".
[13] CCITT Recommendation I.130 (1988): "Method for the characterization of
telecommunication services supported by an ISDN and network capabilities of
an ISDN".
[14] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[15] CCITT Recommendation E.165 (1988): "Timetable for co-ordinated
implementation of the full capability of the numbering plan for the ISDN era
(E.164)".
[16] ITU-T Recommendation I.210 (1993): "Principles of telecommunication services
supported by an ISDN and the means to describe them".
[17] CCITT Recommendation I.232 (1988): "Packet mode bearer services
categories".
[18] CCITT Recommendation X.121 (1992): "International numbering plan for public
data networks".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [12], subclause 2.3,
definition 308.
service; telecommunications service: See ITU-T Recommendation I.112 [12], subclause 2.2,
definition 201.
Supplementary Service (SS): See ITU-T Recommendation I.210 [16], subclause 2.4.

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Virtual Call (VC): See ITU-T Recommendation X.25 [10], clause 3. Instead of "virtual call" also the term
"X.25 call" is used in this ETS.
Permanent Virtual Circuit (PVC): See ITU-T Recommendation X.25 [10], clause 3.
customized service profile: A set of individual service data allocated per ISDN-number for a period of
time to a subscriber registered at the PH. This data includes:
- an access profile: ETS 300 007 [1]-related data (e.g. notification class, access method),
- an X.25 service profile: ITU-T Recommendation X.25 [10], layers 2 and 3 related data.
standard service profile: A set of service data predefined at the PH for subscribers not requiring a fully
individual service profile. The standard service profile comprises just the ITU-T
Recommendation X.25 [10]-related data. The other part of the service data (the access profile) can still be
allocated individually at subscription time.
See annex A for the standard service profile applicable for users subscribing to D-channel access.
default service profile: A set of service data which applies for subscribers not registered at the PH. This
default service profile may be network specific, and includes both, the ETS 300 007 [1]-related data
(access profile) and ITU-T Recommendation X.25 [10]-related data (X.25 service profile).
See annex C for the proposed default service profile.
packet handler, PH: See ETS 300 007 [1].
Packet Mode Bearer Service-D: Basic ISDN PMBS provided by the D-channel.
semi-permanent data link: A data link, whose layer 2 address is allocated at subscription time, and
which is permanently established and kept available by the network between the TE and the PH
independent of X.25 calls (VC, PVC).
Preallocated Logical Link (PLL) (called Permanent Logical Link In edition 1 of this ETS): A data link,
whose layer 2 address is allocated at subscription time, and which is established/released on-demand by
the user or the network between the TE and the PH dependent on X.25 calls (VC).
long-duration PLL: A data link, whose layer 2 address is allocated at subscription time, and which is
established on-demand by the user between the TE and the PH independent of X.25 calls (VC, PVC).
switched data link: A data link, whose layer 2 address is assigned at link activation time, and which is
established/released on-demand by the user or the network between the TE and the PH, dependent on
X.25 calls (VC).
ISDN number: A number conforming to the numbering plan and structure specified in CCITT
Recommendation E.164 [14].
CRF-S: Connection Related Function (in the local exchange) to which Subscribers are connected.
See ETS 300 099 [5] for a more detailed description.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AP Access Profile
CRF-S Connection Related Function
CUG Closed User Group
DDI Direct Dialling In
DSS1 Digital Subscriber Signalling System N0. one
DTE Data Terminal Equipment
FH Frame Handler
ISDN Integrated Services Digital Network
LAPB Link Access Procedure Balanced

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LAPD Link Access Procedure on the D-channel
MSN Multiple Subscriber Number
NPI Numbering Plan Identifier
NT 2 Network Termination 2
NUI Network User Identification
OAM Operation And Maintenance
OSI Open Systems Interconnection
PH Packet Handler
PHI Packet Handler access point Interface
PLL Preallocated Logical Link
PMBS Packet Mode Bearer Services
PRA Primary Rate Access
PSPDN Packet Switched Public Data Network
PISN Private Integrated Services Network
PVC Permanent Virtual Circuit
SAPI Service Access Point Identifier
TA Terminal Adaptor
TE Terminal Equipment
TEI Terminal Endpoint Identifier
TOA Type Of Address
VC Virtual Call
4 Description
This service is described in respect of both the point-to-multipoint and the point-to-point access
configurations. This covers the passive bus and Network Termination 2 (NT2) access arrangements.
These packet mode bearer services allow users (e.g. terminals) in a point-to-point communication
configuration to communicate via the ISDN using ITU-T Recommendation X.25 [10] encoding, by means
of procedures over a D-channel in both directions continuously and simultaneously, for the duration of a
call as described in ETS 300 007 [1] (ITU-T Recommendation X.31 [11]).
No distinct user class is defined for the D-channel at 16 kbit/s. The use of class 30 may be available if the
primary rate access (D-channel at 64 kbit/s) is offered.
NOTE: In case of access via a Terminal Adaptor (TA), the following user classes are
supported at the R-reference points: 8-10, and in addition 11 and 13 on a D -channel
(see ITU-T Recommendation X.1 [8]).
5 Procedures
5.1 Provision and withdrawal
5.1.1 General
The ISDN VC and PVC bearer services shall be either provided by prior arrangement with the service
provider or be available on a general basis. In the latter case, a default service profile applies
(see annex C for a PMBS-D default service profile).
Networks may offer either or both B-channel and D-channel VC- and PVC-bearer services on a general
basis.
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The user may subscribe, on a per ISDN number basis, to:
- an Access Profile (AP). The AP consists of ETS 300 007 [1] related service data and includes the
access method and the notification class;
- an X.25 Service Profile. The X.25 service profile consists of ITU-T Recommendation X.25 [10] layer
2 and layer 3 related service data. The user may subscribe to a customized (essential for PVC
operation) X.25 service profile or to a standard service profile offered by the network. The network
shall at least support the standard ITU-T Recommendation X.25 [10] service profile as described in
annex A.
NOTE 1: The subscription to more than one B- or D-channel access method or ITU-T
Recommendation X.25 [10] service profile per ISDN number is recognized as a
possibility, but not described further on in this ETS.
NOTE 2: ETS 300 007 [1] requires terminals to be identified by means of CCITT
Recommendation E.164 [14] numbers. However, for an interim period, addressing
according to annex D is possible. In this case the terminal address is determined at
subscription time.
5.1.2 Access method
The access method defines the method of establishment and release of a connection between the user
and PH which gives access to the ISDN VC and PVC service.
The network may offer a subset of the access methods using the B- or D-channel, to which the user can
subscribe. Only access methods using the D-channel are within the scope of this ETS. For access
methods using the B-channel, refer to ETS 300 048 [4].
Services provided on the D-channel can only be offered and supported by the network according to
ETS 300 007 [1] case B.
Four D-channel access methods may be supported by the ISDN:
- semi-permanent D-channel access;
- preallocated logical link access;
- long-duration preallocated logical link access;
- switched D-channel access.
NOTE: Subscription to more than one instance of a D-channel access method per
ISDN-number is recognized as a possibility, but not described further on in this ETS.
Hence selection mechanisms between more than one logical link for an incoming call
will be network dependent.
5.1.2.1 Semi-permanent D-channel access
The semi-permanent D-channel access connection between the TE and the PH is permanently available,
independent of ITU-T Recommendation X.25 [10] VC/PVCs. The network is responsible to establish and
maintain the data link connection.
The Terminal Endpoint Identifier (TEI)-value in the layer 2 address at the user-network interface is
agreed upon at subscription time (manual TEI-assignment). The TEI-value shall be within the non-
automatic TEI-range.
For this access method the subscriber is registered. Customized and standard service profiles can be
used, but in case of the PVC service, the user shall have a customized service profile.

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5.1.2.2 Preallocated logical link access
The Preallocated Logical Link (PLL), access connection between the TE and the PH is established
(released) on-demand, by the user or network, depending on the first/last ITU-T
Recommendation X.25 [10] VC, using this connection.
The TEI-value in the layer 2 address at the user-network interface is agreed upon at subscription time
(manual TEI-assignment). The TEI-value shall be within the non-automatic TEI-range.
For this access method the subscriber needs to be registered. Customized and standard service profiles
may be used.
5.1.2.3 Long-duration preallocated logical link access
The long-duration PLL access connection between the TE and the PH is established (released)
on-demand by the user, independent of ITU-T Recommendation X.25 [10] VC/PVCs.
The TEI-value in the layer 2 address at the user-network interface is agreed upon at subscription time
(manual TEI-assignment). The TEI-value shall be within the non-automatic TEI-range.
For this access method the subscriber needs to be registered. Customized and standard service profiles
can be used, but in case of the PVC service, the user shall have a customized service profile.
5.1.2.4 Switched D-channel access
The switched D-channel access connection between the TE and the PH is established (released) on-
demand, by the user or network, depending on the first/last ITU-T Recommendation X.25 [10] VC, using
this connection.
The TEI-value is either within the automatic or within the non-automatic TEI-range.
The TEI-value in the layer 2 address at the user-network interface to be used for a VC is agreed upon
dynamically at call request time; in case of incoming calls (network to user) ETS 300 403-1 [7] call
offering procedure (conditional notification according to ETS 300 007 [1] may be used to interrogate the
layer 2 address to be used for the call).
Subscription to or general availability of the switched D-channel access method implies subscription to or
general availability of the basic service PMBS-D.
For this access method the subscriber needs not necessarily be registered, in which case he uses a
default service profile. Else customized or standard service profiles can be used.
5.1.2.5 Notification class
For notification of the user of incoming packet calls, two classes are applicable for use with the D-channel
access methods: the "no notification" and the "conditional notification" classes.
The "no notification" class applies to all D-channel access methods. No ETS 300 403-1 [7] signalling
procedures are used to notify the user of incoming calls. An incoming call packet will directly be delivered
over an existing access connection.
The "conditional notification" class can be subscribed to for switched D-channel access method only.
ETS 300 403-1 [7] call offering procedures may be used to notify the subscriber of an incoming packet
call. A switched D-channel access connection may then be established before incoming call packet
delivery.
NOTE: The "unconditional notification" class as defined in ITU-T Recommendation X.31 [11] is
not supported.
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5.1.3 X.25 service profile
The X.25 service profile is defined in ITU-T Recommendation X.25 [10].
Its layer 3 part includes, amongst others, subscription to:
- a logical channel range (ITU-T Recommendation X.25 [10] annex A) including those defined for
PVCs. It does not apply to those access instances for which there is subscription to a customized
logical channel range.
Layer 2 parameters for the D-channel access methods cannot be selected; they are determined by
ETS 300 402-2 [6] procedures and system parameters Link Access Procedure on the D-channel (LAPD)
selected for the network.
Subscription to the VC bearer service is possible in conjunction with any access method and independent
of the number of such access connections.
Subscription to PVC services provided by the D-channel may only be in conjunction with subscription to
the semi-permanent or to the long-duration PLL access method.
5.2 Access connection procedures
All packet information is conveyed between the user and the PH in LAPD data link connections generally
identified by Service Access Point Identifier (SAPI) 16. Each terminal has its own logical link(s) identified
by Terminal End Point Identifier (TEI) value(s).
The procedures for establishment (release) of an access connection between the Data Terminal
Equipment (DTE) and the Packet Handler (PH) involve layer 1 activation (deactivation) and layer 2
activation (deactivation).
On layer 3, ITU-T Recommendation X.25 [10], packet layer procedures are used. Since the information
field of LAPD frames is restricted
...