ETSI ETS 300 049 ed.1 (1992-01)

Integrated Services Digital Network (ISDN); ISDN Packet Mode Bearer Services (PMBS); ISDN Virtual Call (VC) and Permanent Virtual Call (PVC) bearer services provided by the D-channel of the user access - basic and primary rate

T/NA1(89)30

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

General Information

• Status: Published
• Publication Date: 30-Jan-1992
• Technical Committee: NA 1 - User Interfaces, Services and Charging
• Current Stage: 12 - Completion
• Due Date: 03-May-1991
• Completion Date: 31-Jan-1992
• Ref Project: SIST ETS 300 049 E1:2003 - Integrated Services Digital Network (ISDN); ISDN Packet Mode Bearer Services (PMBS); ISDN Virtual Call (VC) and Permanent Virtual Call (PVC) bearer services provided by the D-channel of the user access - basic and primary rate

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 049 E1:2003
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 Services
(PMBS); ISDN Virtual Call (VC) and Permanent Virtual Call (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 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 049 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 049 E1:2003

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SIST ETS 300 049 E1:2003
EUROPEAN ETS 300 049
TELECOMMUNICATION January 1992
STANDARD
Source: ETSI TC-NA Reference: T/NA1(89)30
ICS: 33.080
Key words: ISDN, bearer service
Integrated Services Digital Network (ISDN);
ISDN Packet Mode Bearer Service (PMBS)
ISDN Virtual Call (VC) and Permanent Virtual Call (PVC)
bearer services provided by the D-channel of the user access -
basic and primary rate
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 1992. All rights reserved.
New presentation - see History box

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ETS 300 049: January 1992
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
1 Scope .7
2 Normative references .7
3 Definitions.8
4 Description .9
5 Procedures.9
5.1 Provision and withdrawal .9
5.2 Normal procedures.9
5.2.1 Activation, deactivation and registration.9
5.2.2 Invocation and operation .9
5.2.2.1 Virtual call procedures.9
5.2.2.1.1 Layer 1 activation.9
5.2.2.1.2 Layer 2 activation (logical link).10
5.2.2.1.3 Terminal selection and identification.10
5.2.2.1.3.1 Terminal interface identification -
network to terminal.10
5.2.2.1.3.2 Terminal Interface identification -
terminal to network.11
5.2.2.1.4 Call establishment .11
5.2.2.1.5 Data transfer .11
5.2.2.1.6 Terminating the call .11
5.2.2.1.7 Layer 2 deactivation .11
5.2.2.1.8 Layer 1 deactivation .11
5.2.2.2 Permanent virtual circuit procedures. 11
5.2.2.2.1 Layer 1 activation.11
5.2.2.2.2 Layer 2 activation.11
5.2.2.2.3 Terminal selection/identification .11
5.2.2.2.4 Call establishment .11
5.2.2.2.5 Data transfer .12
5.2.2.2.6 Terminating the call .12
5.2.2.2.7 Layer 2 deactivation .12
5.2.2.2.8 Layer 1 deactivation .12
5.2.3 Interrogation and editing .12
5.3 Exceptional procedures .12
5.3.1 Activation, deactivation and registration.12
5.3.2 Invocation and operation .12
5.3.2.1 Virtual call.12
5.3.2.2 Permanent virtual circuit .12
5.3.3 Interrogation and editing .12
6 Network capabilities for charging .12
7 Interworking.13
7.1 Interworking between public networks .13
7.2 Interworking between private and public ISDNs .13
8 Interaction with supplementary services .13
9 Attributes and values of attributes (including the provision of individual bearer services) .13

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9.1 Attributes/values.13
9.2 Provision of individual bearer services.15
Annex A (normative): Standard service profile.16
Annex B (normative): User facilities.17
Annex C (informative): Transition schemes for addressing and numbering .18
Annex D (informative): Bibliography.19
History .20

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ETS 300 049: January 1992
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI). It describes the
stage one requirements of the ISDN Packet Mode Bearer Service (PMBS) provided on the D-channel of
the user access. Services using the B-channel are covered in ETS 300 048.
The requirements described in this ETS are applicable only to those services within Europe, and are based
on CCITT Recommendation I.232 [12]. This service description corresponds to case B (D-channel) of draft
ETS 300 007 [1] (the European equivalent to CCITT Recommendation I.462/X.31 case B).
The requirements for stage three of this service are contained in ETS 300 007 [1].
Annexes A and B are normative, Annexes C and D are informative.

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Blank page

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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.
This ETS does not define details of the interworking requirements of private ISDNs with the public ISDN.
In addition, this ETS specifies the base functionality where the service is provided to the user via a private
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 categories provides the
unrestricted transfer (without alteration) of user information in a packetised 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 CCITT Recommendation I.232 [12].
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 authorisation 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 300 125 (1991): "Integrated Services Digital Network (ISDN); User-
network interface data link layer specifications; Application of CCITT
Recommendations Q.920/I.440 and Q.921/I.441".
[3] ETS 300 102-1 (1990): "Integrated Services Digital Network (ISDN); User-
network interface layer 3; Specifications for basic call control".

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[4] CCITT Recommendation X.25 (1988): "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".
[5] CEPT Recommendation T/CD 08-03: "General interworking and service aspects
of packet switched public data networks".
[6] ETS 300 012: "Integrated Services Digital Network (ISDN); Basic user-network
interface; Layer 1 specification and test principles".
[7] ETS 300 011: "Integrated Services Digital Network (ISDN); Primary rate user-
network interface; Layer 1 specification and test principles".
[8] CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".
[9] CCITT Recommendation I.210 (1988): "Principles of telecommunication services
supported by an ISDN and the means to describe them".
[10] CCITT Recommendation E.164 (1988): "Numbering plan for the ISDN era".
[11] CCITT Recommendation X.1 (1988): "International user classes of service in
public data networks and Integrated Service Digital Networks (ISDNs)".
[12] CCITT Recommendation I.232: "Packet-mode bearer services categories".
[13] CCITT Recommendation I.130 (1988): "Method for the characterisation of
telecommunication services supported by an ISDN and network capabilities of an
ISDN".
3 Definitions
For the purposes of this ETS, the following definitions apply:
Integrated Services Digital Network (ISDN): see CCITT Recommendation I.112 [8], § 2.3, definition
308.
service; telecommunications service: see CCITT Recommendation I.112 [8], § 2.2, definition 201.
supplementary service: see CCITT Recommendation I.210 [9], § 2.4.
virtual call: see CCITT Recommendation X.25 [4], § 3.
permanent virtual circuit: see CCITT Recommendation X.25 [4], §3.
service profile: see CCITT Recommendation X.25 [4].
packet handler: see ETS 300 007 [1].
semipermanent: see ETS 300 007 [1].
party number: as ISDN number, a number conforming to the numbering plan and structure specified in
CCITT Recommendation E.164 [10].
party subaddress: see CCITT Recommendation E.164 [10], § 11.2.

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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 Terminating 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 CCITT Recommendation X.25 [4] 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] (CCITT Recommendation I.462/X.31).
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 D64-channel
(see CCITT Recommendation X.1 [11]).
5 Procedures
5.1 Provision and withdrawal
This service shall either be provided by prior arrangement with the service provider, or be available on a
general basis.
The user may subscribe to:
- a specific CCITT Recommendation X.25 [4] profile (essential for PVC operation); or
- a standard service profile, as described in Annex A.
NOTE: ETS 300 007 [1] requires terminals to be identified by means of CCITT
Recommendation E.164 [10] numbers. However, for an interim period, addressing
according to Annex C is possible. In this case the terminal address is determined at
subscription time.
5.2 Normal procedures
5.2.1 Activation, deactivation and registration
Not applicable.
5.2.2 Invocation and operation
VC and PVC virtual circuit procedures can be invoked and operated by a given terminal concurrently.
5.2.2.1 Virtual call procedures
5.2.2.1.1 Layer 1 activation
Layer 1 shall be permanently active or activated on demand by the Data Terminating Equipment (DTE) or
the Packet Handler (PH). For Primary Rate Access (PRA), layer 1 is permanently active.

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5.2.2.1.2 Layer 2 activation (logical link)
All packet information is conveyed in logical links identified by Service Access Point Identifier (SAPI) = 16.
Each terminal has its own logical link (SAPI = 16) identified by Terminal End Point Identifier (TEI) value.
Three different methods of layer 2 activation can be identified as network options.
- Method 1 - Semi-permanent layer 2:
Logical links between the TA / Terminal Equipment type 1 (TE1) and the network PH are activated
at subscription time. The network shall keep the data link layer in the activated state.
- Method 2 - On demand Layer 2 with fixed TEI values (see ETS 300 125 [2]):
The TEI of the TA/TE1 is assigned at subscription time (known by the network), ie. manual TEI
assignment is used. The activation of a logical link is initiated either by the TA/TE1 or the network
depending on the direction of the first VC. No ETS 300 102 [3] (CCITT Recommendation Q.931)
procedures are used.
- Method 3 - On demand Layer 2 with dynamic TEI allocation (see ETS 300 125 [2]):
The activation of a logical link is initiated either by the TA/TE1 or the network depending on the
direction of the first VC. In the case of incoming calls (network to user), ETS 300 102 Part 1 [3]
(CCITT Recommendation Q.931) call offering procedure (conditional notification class according to
ETS 300 007 [1]) may be used to interrogate the layer 2 address (TEI) to be used for the call.
NT2s may use multiple layer 2 connections (ie. multiple TEIs) concurrently. However, this
multiplexed layer 2 packet transfer capability implies that the incoming calls, if notification takes
place, are notified via the broadcast link (SAPI = 0) in order to allow the user (i.e. the NT2) to
respond on the appropriate SAPI = 0 data link, corresponding to the SAPI=16 data link to be used
for the CCITT Recommendation X.25 [4] incoming call packet presentation.
5.2.2.1.3 Terminal selection and identification
5.2.2.1.3.1 Terminal interface identification - network to terminal
Users can operate several packet terminals in their in-house installation. In general, an ISDN number is
used to identify a user access. In addition, the Multiple Subscriber Number (MSN) or Direct Dialling In
(DDI) facilities may be used, thus allowing the allocation of a specific ISDN number to a given
terminal/terminal adaptor.
The PH selects a specific logical link (terminal) based on the ISDN number. Successive incoming calls to
the same ISDN number shall be directly multiplexed on an already established logical link, irrespective of
information contained in the CCITT Recommendation X.25 [4] called address extension facility field.
NOTE: In the case of no notification class, the PH could make use of this information to identify
a specific logical link (Annex G of CCITT Recommendation X.25 [4]). This would be a
non-standard use of a facility intended to support the Open Systems Interconnection
(OSI) network service. In addition to these methods, additional digits from the CCITT
Recommendation X.121 numbering scheme can be allocated to a user as described in
CEPT Recommendation T/CD 08-03 [5] if the addressing scheme in Annex C is used.

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5.2.2.1.3.2 Terminal Interface identification - terminal to network
In the case of non-dynamic assignment of TEIs the terminal is identified by the layer 2 address (TEI value).
In the case of dynamic assignment of TEIs and using MSN, DDI or CCITT Recommendation X.121
subaddresses, the terminal identity is derived from the first call request after successful activation of layer
2. In this case the terminal shall provide its identity immediately after layer 2 activation, otherwise a call to
the terminal may not be successful.
5.2.2.1.
...