ISO/IEC 13247:1997
(Main)Information technology — Telecommunications and information exchange between systems — Broadband Private Integrated Services Network — Inter-exchange signalling protocol — Basic call/connection control
Information technology — Telecommunications and information exchange between systems — Broadband Private Integrated Services Network — Inter-exchange signalling protocol — Basic call/connection control
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé à large bande à intégration de services — Protocole de signalisation d'échange — Appel de base/contrôle de connexion
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ISOAEC
INTERNATIONAL
13247
STANDARD
First edition
1997-12-15
Information technology -
Telecommunications and information
exchange between Systems - Broadband
Private Integrated Services Network -
Inter-exchange signalling protocol-
Basic call/connection control
- T6kcommunications et khange
Technologies de I’informa tion
d ‘in forma tion en tre sys fernes - ßkseau priv6 6 /arge bande ti integration
- Protocole de signalisation d ’kchange - Appel de
de Services
basekon tr6le de connexion
Reference number
ISO/1 EC 13247: 1997(E)
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ISWIEC 13247: 1997(E)
Contents
Page
. . .
Vlll
Foreword
ix
Introduction
1
1. Scope
2. Conformance
3. Normative references
3. W References from ISO, IEC or ITU-T
3.2 References from other sources
4. Definitions
4.1 Definitions in PNNI 1 .O
4.2 Other external definitions
4.3 Other definitions
5. List of acronyms
6
6. General Principles
7
6.1 Protocol model
8
6.2 Services provided to CCH
9
6.3 Services required of the SAAL
9
6.4 Protocol Control states
9
6.4. P Callkonnection states
9
6.4.2 Additional callkonnection states relating to the Provision of N-PISN Services
9
6.4.3 States for restart initiation
9
6.4.4 States for restart response
9
6.5 CCH states at a Transit PINX
10
6-5.1 TC@ Idle (0)
-
Incoming Cal1 Proceeding (4) 10
6.5.2 TCC
- - -
6.5.3 TCC Transit Cal1 Proceeding (5) 10
- - -
10
6.5.4 TCC Cal1 Alerting (6)
- -
10
6.5.5 TCC Cal1 Active (7)
- -
6.5.6 TCC Await Incoming Release (8) 10
- - -
Release (9)
6.5.7 TCC Await Outgoing 10
- - -
0 ISOAEC 1997
All rights reserved. Unless otherwise specified, no part sf this publication may be reproduced or utilized in any form or by any means,
electronie or mechanical, including ghotocogying and mncrofilm, without permission in writing from the publisher.
ISO/IEC Copyright Office l Case gostale 56 l CI-LI2ä X Geneve 20 Q Switzerland
Printed in Switzerland
ii
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0 ISO/IEC ISO/IEC 13247: 1997(E)
6.5.8 TCC Await Two-Way Release (10) 10
- - -
6.6 Additional CCH states relating to the Provision of N-PISN Services at a Transit PINX 10
6.6.1 TCC Await Digits (1) 10
-
-
6.6.2 TCC Await Additional Digits (2) 10
- - -
6.6.3 TCC Overlap (3) 10
-
7. Message functional definitions and content 10
7.1 Messages for B-QSIG call/ connection control 11
7.1.1 ALERTING 11
11
7.1.2 CALL PROCEEDING
7.1.3 CONNECT 11
11
7.1.4 RELEASE
7.1.5 RELEASE COMPLETE 11
11
7.1.6 SETUP
7.1.7 NOTIFY 12
12
7.1.8 PROGRESS
7.2 Additional or modified messages related to the support of 64 kbit/s based PISN circuit-mode
13
Services
7.2.1 ALERTING 13
'7.2.2 CONNECT 13
7.2.3 PROGRESS 14
7.2.4 RELEASE 14
14
7.2.5 SETUP
7.2.6 INFORMATION 14
7.2.7 SETUP ACKNOWLEDGE 15
7.3 Messages for Point-to-multipoint call/connection control 15
7.3.1 ADD PARTY 15
7.3.2 ADD PARTY ACKNOWLEDGE 16
7.3.3 PARTY ALERTING 16
7.3.4 ADD PARTY REJECT 16
7.3.5 DROP PARTY 16
7.3.6 DROP PARTY ACKNOWLEDGE 16
7.4 Messages used with the global cal1 reference 16
8. General message format and information elements coding
16
8.1 Overview 16
8.2 Protocol discriminator
16
8.3 Cal1 reference 17
8.4 Message type, and message length 17
8.4.1 Message type 17
8.4.2 Message length 17
8.5 Variable length information elements for B-ISDN environment 17
8.5.1 Coding rules 17
. . .
111
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ISOAEC 13247: 1997(E)
17
8.5.2 Extensions of Codesets
17
8.5.3 Broadband-locking shift procedure
118
8.5.4 Broadband-non-locking shift procedure
18
8.5.5 ABR additional Parameters
18
8.5.6 ABR setup Parameters
18
8.5.7 Alternative ATM traffit descriptor
18
8.5.8 ATM adaptation layer Parameters
18
8.5.9 ATM traffit descriptor
18
8.5.10 Broadband bearer capability
18
8.5.11 Broadband high layer information (B-HLI)
18
8.5.12 Broadband low layer information (B-LLI)
18
8.5.13 Broadband repeat indicator
18
8.5.14 Broadband sending complete
18
8.5.15 Cal1 state
19
8.5.16 Called Party number
20
8.5.17 Called Party subaddress
20
8.5.18 Calling Party number
8.5.19 Calling Party subaddress 20
20
8.5.20 Cause
20
8.5.2 1 Connected number
21
8.5.22 Connected subaddress
21
8.5.23 Connection identifier
21
8.5.24 Connection scope selection
21
8.5.25 End-to-end transit delay
21
8.5.26 Extended Quality of Service (QOS) Parameter
21
8.5.27 Minimum acceptable ATM traffit descriptor
21
8.5.28 Notification indicator
21
8.5.29 Quality of Service (QOS) Parameter
21
8.5.30 Restart indicator
8.5.3 1 Transit network selection 21
22
8.5.32 OAM traffit descriptor
8.5.33 Progress indicator 22
22
8.5.34 Calling Party soft PVPC or PVCC
8.5.35 Called Party soft PVPC or PVCC 22
22
8.6 Information Elements for the support of 64 kbit/s based ISDN circuit mode services
22
8.6.1 Narrow-band bearer capability
8.6.2 Narrow-band high layer compatibility 22
22
8.6.3 Narrow-band low layer compatibility
8.6.4 Progress indicator 22
22
8.7 Information Elements for Point-to-Multipoint CalUconnection control
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ISO/IEC 13247: 1997(E)
0 ISO/IEC
22
9. Protocol control procedures for B-QSIG Point-to-Point calls/connections
23
9.1 Establishment of a signalling AAL
23
CallKonnection establishment
9.2
23
9.2. I Handling of a PROGRESS message
23
9.2.2 CalVconnection failure
24
9.3 Call/Connection Clearing
24
9.4 Call/connection collisions
24
9.5 Restart procedure
24
9.6 Handling of error conditions
24
message
9.6.1 Sending a STATUS
9.6.2 Determination of protocol state compatibility on receipt of a STATUS message containing a cal1 reference
24
other than the global cal1 reference
25
9.7 Error procedures with explicit action indication
25
9.8 Handling of messages with insufficient information
25
9.9 Notification procedures
25
9.10 Notification of interworking
25
9.11 List of Timers
26
10. Call/connection Controi Procedures for Point-to-Multipoint Calls
11. Procedures for the support of 64 kbit/s based circuit mode basic Services in B-PISN and
26
interworking between N-PISNs and B-PISNs
26
1 f . P Introduction
27
11.2 Use of information elements for N-PISN Services
27
11.2.1 General aspects
27
11.2.2 Bearer Service related information
29
11.2.3 Low layer related information
31
11.2.4 Higher layer related information
31
11.25 Handling of inconsistent combination of Service Parameters
31
11.3 Interworking PINX procedures for the succeeding side
31
11.3.1 Mapping of Service related information
32
11.3.2 Mapping of Cause information
32
11.4 Interworking PINX procedures for the precedincr side
32
11.4.1 General aspects
32
11.4.2 Mapping of Service related information
32
11.4.3 Mapping of Cause information
33
11.5 Overlap sending
33
11.51 Preceding side procedures
33
11.5.2 Succeeding side procedures
34
11.6 Notification of interworking
34
11.7 Tones and announcements
34
I 1.7.11 Tones and announcements during cal1 establishment
34
and announcements are provided
11.7.2 Clearing when tones
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0 ISO/IEC
ISO/IEC 13247: 1997(E)
34
12. Callkonnection handling requirements
34
12.1 Transit PINX call/connection handling requirements
35
12.1.1 Receipt of SETUP message
35
12.1.2 Channel through connection procedures
35
12.1.3 State TCC Tncoming Cal1 Proceeding
-
- -
35
Proceeding
12.1.4 State TCC Transit Cal1
- -
-
36
12.1.5 State TCC Cal1 Alerting
- -
36
12.1.6 State TCC Cal1 Active
- -
36
12.1.7 Clearing at a Transit PINX
37
12.1.8 Additional procedures for N-PISN interworking
39
12.1.9 Handling of basic cal1 information elements at a Transit PINX
41
12.1.10 Notifications
41
12.2 Originating PINX call/connection handling requirements
41
12.2.1 Transmission of the SETUP message
42
12.2.2 Connection to the user plane virtual channel
42
12.2.3 Receipt of an ALERTING message
42
12.2.4 Receipt of a CONNECT message
42
12.2.5 Receipt of PROGRESS message
42
12.2.6 Notifications
42
12.2.7 CalVconnection Clearing initiated by the Originating PINX
42
12.2.8 Receipt of an indication of call/connection Clearing
43
12.3 Terminating PINX call/connection handling requirements
43
12.3.1 Receipt of the SETUP message
43
12.3.2 Transmission of an ALERTING message
43
12.3.3 Transmission of a CONNECT message
43
12.3.4 Notifications
43
12.3.5 CalI/connection Clearing initiated by the Terminating PINX
44
12.3.6 Receipt of an indication of call/connection Clearing
44
12.4 Incoming Gateway PINX call/connection handling requirements
44
12.4.1 Transmission of the SETUP message
44
12.4.2 Connection of the user plane virtual channel
12.4.3 Receipt of ALERTING imessage 45
45
12.4.4 Receipt of CONNECT message
12.4.5 Receipt of PROGRESS message 45
45
12.4.6 Notifications
12.4.7 CaWconnection Clearing initiated by the Gateway PINX 45
45
12.4.8 Receipt of an indication of call/connection Clearing
45
12.5 Outgoing Gateway PINX call/connection handling requirements
45
12.5.1 Receipt of the SETUP message
12.5.2 Connection of the user plane virtual channel 46
46
12.5.3 Transmission of ALERTING message
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0 ISO/IEC ISO/IEC 13247: 1997(E)
46
12.54 Transmission of CONNECT message
12.5.5 Transmission of PROGRESS message 46
46
12.56 Notifcations
12.5.7 Call/connection Clearing initiated by the Gateway PINX 46
47
12.5.8 Receipt of an indication of call/connection Clearing
12.6 Interworking PINX call/connection handling requirements for N-PISN -> B-PISN
47
interworking
12.6.1 Transmission of the SETUP message 47
47
12.6.2 Connection of the user plane virtual channel
12.6.3 Receipt of progress indicators 47
47
12.6.4 Receipt sf CONNECT message
12.6.5 CalVconnection Clearing initiated by the interworking PINX 47
12.7 Interworking PINX call/connection handling requirements for B-PISN -> N-PISN
48
interworking
12.7.1 Receipt of the SETUP message 48
12.7.2 Transmission of progress indications 48
48
12.7.3 Transmission of CONNECT message
12.7.4 CalVconnection Clearing initiated by the Interworking PINX 48
50
Annex A - Prstocol Implementation Conformance Statement (PICS) proforma
72
Annex B - Soft permanent virtual connection procedures
Annex C - Mapping functions to support 64 kbit/s based circuit-mode PISN Services in
B-PISNs and interworking between N-PISNs and B-PISNs (QSIG/B-QSIG) 73
Annex D - Specification and Description Language (SDL) representation of protocol control
78
procedures
117
Annex E - Guidelines for the use of instruction indicators
- Description of the capabilities supported by the protocol defined in this
Annex F
International Standard 119
Annex G - Specification and Description Language (SDL) representation of CCH at a
122
Transit PINX and at an Interworking PINX
135
Annex H - Manufacturer specific information
136
Annex 1 - Possible strategies for avoidance of IPVCI collisions
Annex J - Differentes between this International Standard and PNNI 1.0 137
Annex K - Specification and Description Language (SDL) representation of point-to-
multipoint procedures 838
Annex L - Guidelines for interworking with ATM Forum PNNI I.0 Y40
vii
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ISO/IEC 13247: 1997(E) 0 ISO/IEC
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form
the specialized System for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal
with particular fields of technical activity. ISO and IEC technical committees collaborate in Felds of mutual interest.
Other international organizations, govemmental and non-govemmental, in liaison with ISO and IEC, also take part in
the work.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC I . Draft
International Standards adopted by the Joint technical committee are circulated to national bodies for voting. Publication
as an International Standard requires approval by at least 75 % of the national bodies casting a vote.
International Standard ISO/IEC 13247 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information
technology, Subcommittee SC 6, Telecommunications and information exchange between Systems.
Annexes A and B form an integral part of this International Standard. Annexes C to L are for information only.
0.0
VllP
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0 ISOAEC ISO/IEC 13247: 1997(E)
Introduction
This International Standard is one of a series of International Standards def-ining Services and signalling protocols
applicable to Broadband Private Integrated Services Networks (B-PISNs). The series uses B-ISDN concepts as
developed by ITU-T and conforms to the fiamework of International Standards for Open Systems Interconnection as
defined by ISOAEC.
This particular International Standard specifies the signalling protocol for use at the Q reference Point for basic
call/connection control (B-QSIG-BC).
iX
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INTERNATIONAL STANDARD 0 ISO/IEC ISO/IEC 13247: 1997(E)
Information technology - Telecommunications and information exchange
between Systems - Broadband Private Integrated Services Network -
Inter-exchange signalling protocol- Basic call/connection control
1 Scope
This International Standard defines the signalling protocol for the purpose of basic call/connection control at the Q
reference Point between Private Integrated Services Network Exchanges (PINXs) connected together within a
Broadband Private Integrated Services Network (B-PISN) employing Asynchronous Transfer Mode (ATM). This
International Standard is gart of the B-QSIG signalling System.
The Q reference Point is defined in ISO/IEC 11579-1.
This International Standard is an application of the signalling protocol that forms part of the ATM Forum ’s PNNI 1 .O
specification, which in turn is based on ITU-T Recommendation 4.293 1, including the provisions for symmetrical
Operation described in annex H of recommendation Q.293 1. Technical differentes compared with the signalling
protocol specified in PNNI 1 .O are summarized in annex J. Guidelines for interworking between a network employing
the signalling protocol specified in this International Standard and a network employing the ATM Forum ’s PNNI 1.0
specification are given in annex L.
This International Standard is applicable to PINXs which interconnect to form a B-PISN using static hop-by-hop
routeing. It therefore complements the ATM Forum ’s PNNI 1.0 specification, which is applicable to networks that
employ dynamic Source routeing.
The basic capabilities supported by the protocol specified in this International Standard are listed below and described
in more detail in annex F:
- demand (switched) virtual channel and virtual path connections;
- Point-to-Point switched virtual channel and virtual path connections;
- Point-to-multipoint virtual channel connections;
-
connections with symmetric or asymmetric bandwidth requirements;
-
Single-connection (Point-to-Point) calls;
- basic signalling functions via protocol messages, information elements, and procedures;
- CBR, VBR (realtime and non-realtime), UBR and ABR Service categories;
-
negotiation of certain signalling Parameters;
-
inter-PINX virtual channel identifier (IPVCI) negotiation;
-
out-of-band signalling for all signalling messages;
- error recovery;
- B-PISN addressing formats;
-
end-to-end compatibility Parameter identification;
-
signalling interworking with N-PISN and Provision of N-PISN Services;
- forward compatibility;
- call/connection handling at different types of PINX, including Transit PINX, Originating PINX, Terminating PINX,
Incoming Gateway PINX, Outgoing Gateway PINX and Interworking PINX;
- Signalling of individual QOS Parameters
- ATM anycast addresses
- Negotiation of ATM traffit descriptors
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0 ISO/IEC
ISO/IEC 13247: 1997(E)
- Soft PVPC and PVCC support
Generic Identifier Transport
2
Conformance
In Order to conform to this International Standard, a PINX shall satisfy the requirements identified in the Protocol
Implementation Conformance Statement (PICS) proforma in annex A.
3 Normative references
References from ISO, IEC or ITU-T
31 .
through reference in this text, constitute provisions of this
The following Standards contain provisions which,
International Standard. At the time of publication, the editions indicated were valid. All Standards are subject to
revision, and Parties to agreements based on this International Standard are encouraged to investigate the possibility of
applying the most recent editions of the Standards indicated below. Members of IEC and ISO maintain registers of
currently valid International Standards.
- Open Systems Interconnection - Network Service Definition.
ISO/IEC 8348: 1996, Information technology
Open Systems Interconnection - Conformance testing methodology
ISO/IEC 9646- 1: 1994, Information technology -
andframework - Part 1: General concepts.
ISO/IEC 9646-7: 1995, Information technology - Open Systems Interconnection - Conformance testing methodology
andframework - Part 7: Implementation Conformance Statements.
Telecommunications and information exchange between Systems -
ISO/IEC 1157 1: 1994, Information technology -
Numbering and sub-addressing in private integrated Services networks.
ISO/IEC 11572: 1997, Information technology - Telecommunications and information exchange between Systems -
Private Integrated Services Network - Circuit mode bearer Services - Inter-exchange signalling procedures and
protocol.
ISO/IEC 11574: 1994, Information technology - Telecommunications and information exchange between Systems -
Circuit-mode 64 kbit/s bearer Services - Service description, functional
Private Integrated Services Network -
capabilities and informationflows.
ISO/IEC 11584: 1996, Information technology - Telecommunications and information exchange between Systems -
- Service description, functional
Private Integrated Services Network - Circuit-mode multi-rate bearer Services
capabilities and informationflows.
ISO/IEC 11579- 1: 1994, Information technology - Telecommunications and information exchange between Systems --
Private integrated Services network - Part 1: Reference configuration for PISN exchanges (PINX).
ISO/IEC 13246: 1997, Information technology - Telecommunications and information exchange between Systems -
Broadband Private Integrated Services Network - Inter-exchange signalling protocol - Signalling ATM adaptation
layer.
CCITT Rec. E. 164: 199 1, Numbering plan for the ISDN era.
CCITT Rec. 1.112: 1988, Vocabulary of terms for ISDNs (Blue Book).
CCITT Rec. 1.330: 1988, ISDN numbering and addressingprinciples (Blue Book).
CCITT Rec. Q.9: 1988, Vocabulary of switching and signalling terms (Blue Book).
CCITT Rec. 2.100: 1988, SpeciJication and Description Language (Blue Book).
ITU-T Rec. 1.32 I : 199 1, B-ISDNprotocol reference model and its application.
ITU-T Rec. 1.363:1996, B-ISDN ATM adaptation layer (AAL) specification.
ITU-T Rec. 1.37 1: 1996, Traffit control and congestion control in B-ISDN.
ITU-T Rec. 1.6 IO: 1994, B-ISDN Operation and maintenance principles andfunctions.
ITU-T Rec. Q.293 I : 1995, Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling
User-Network Interface (UNI) layer 3 specification for basic call/connection control.
System No. 2 (DSSZ) -
2
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ISO/IEC 13247: 1997(E)
0 ISO/IEC
ITU-T Rec. 4.297 I : 1996, Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling
User-Network Interface (UNI) layer 3 specification for Point-to-multipoint caU/connection
System No. 2 (DSSZ) -
control.
References from other sources
32 .
All references in this subclause were correct at the time of approval of this International Standard. The provisions of the
referenced specifications, as identified in this subclause, are valid within the context of this 1s. The reference to a
specification within this IS does not give it any further Status within ISO/IEC; in particular, it does not give the
referenced specification the Status of an International Standard.
ATM Forum PNNI 1 .O: 1996, Private Network-Network Interface Specification Version 1.0 (af-pnni-0055.000).
ATM Forum UNI 4.0: 1996, User-Network Interface (UN4 Signalling Specification Version 4.0 (af-sig-0061.000)
4 Definitions
For the purposes of this International Standard, the following definitions apply.
41 . Definitions in PNNI 1.0
References contained in sections 2.2 and 6.1 of PNNI 1 .O are applicable with the exception of the definitions applicable
to the routing sections of PNNI 1 .O and with the exception of terms for which there are replacement definitions in 4.2
and 4.3 of this International Standard.
Where text of PNNI 1 .O is referenced from this International Standard, terms used within the referenced text shall be
interpreted a shown in Table 1.
Table 1 - Interpretation of PNNI terms
Term used in PNNI referenced text Interpretation for the purposes of this
International Standard
PTNX
network node
I
I
cal1 call/connection
I I I
logical link inter-PINX link (IPL)
I I
physical link inter-PINX link (IPL)
I I
virtual channel identifier (VCI) inter-PINX virtual channel identifier (IPVCI)
I I
virtual path identifier (VPI) inter-PINX virtual path identifier (IPVPI)
I
I I
PNNI interface inter-PINX link (IPL)
I I
PNNI link inter-PINX link (IPL)
I I
42 . Other external definitions
This International Standard uses the following terms defined in other documents:
- ATM transfer capability (ATC) (ITU-T Rec. 1.371)
(CCITT Rec. Q.9)
- connection
- FS (ITU-T Rec. 1.610)
- private integrated Services network (PISN) (ISO/IEC 11579-1)
- private integrated Services network exchange (PINX) (ISO/IEC 11579-1)
-
signahing (CCITT Rec. 1.112)
-
(CCITT Rec. 1.321)
user plane
43 . Other definitions
4.3.1 ATM endsystem address: the address of a Point of attachment to an ATM network.
4.3.2 broadband private integrated Services network (B-PISN): a PISN that offers ATM Services to its users and
3
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0 ISO/IEC
ISO/IEC 13247: 1997(E)
employs ATM transmission between PINXs and ATM switching.
4.3.3 caII: an association between two or more users for the use or attempted use of a telecommunication Service.
4.3.4 call/connection: a cal1 combined with a Single connection in the user plane for the transfer of user information.
of signalling the called number information in which all called number digits are
4.3.5 en bloc: a method
Party Pa*Y
sent in the first message.
4.3.6 gateway PINX: within the context of a call/connection, a PINX which performs interworking between B-QSIG
and another signahing System.
4.3.7 incoming call/connection: a call/connection using an IPL from the Point of view sf the succeeding side of that
IPL.
4.3.8 incoming gateway PINX: a Gateway PINX that routes a call/connection from a route employing another
signahing System on to an IPL employing B-QSIG signalling. (See Figure 1.)
4.3.9 information element: a component of a message.
4.3.10 information element with invalid contents: an information element that is recognized, but whose contents
cannot be interpreted as valid using the rules specified in clause 8 of this International Standard, or that contains field
values that are marked as ((reserved» in clause 8 of this International Standard.
4.3.11 inter-PINX link (IPL): a link between the Q reference Points of two PINXs, the link comprising a signahing
IPVC together with one or more user information IPVCs under the control sf that signalling IPVC.
4.3.12 inter-PINX virtual channel (IPVC): one of a number of bi-directional transfers of digital information,
multiplexed at the ATM layer, between two PINXs.
NOTE 1. An IPVC tan be a Single virtual channel or a concatenation of virtual channels.
4.3.13 inter-PINX virtual channel identifier (IPVCI): an integer that identifies an IPVC within the context of an
IPVP.
4.3.14 inter-PINX virtual path (IPVP): a grouping of one or more IPVCs within a Single IPL.
4.3.15 inter-PINX virtual path identifier (IPVPI): an integer that identifies an IPVP within the context of an IPL.
4.3.16 interworking PINX: within the context of a call/connection, a PINX that performs interworking between a
B-PISN and a N-PISN.
NOTE 2. An interworking PINX will also be either an Originating PINX, a Terminating PINX or a Gateway PINX.
4.3.17 narrow-band private integrated Services network (N-PISN): a PISN that offers only 64 kbit/s-based Services
to its users.
4.3.18 originating PINX: within the context of a call/connection, the PINX to which the calling user is attached. (See
Figure 1.)
4.3.19 outgoing call/connection: a call/connection using an IPL from the Point of view of the preceding side of that
IPL.
4.3.20 outgoing gateway PINX: a Gateway PINX that routes an incoming call/connection f?om an IPL employing
B-QSIG signalling on to a route employing another signalling System. (See Figure 1.)
4.3.21 overlap: a method of signalling the called Party number information in which no& all called Party number
information is sent in the same message.
4.3.22 preceding PINX: within the context of a call/connection using an IPL, the PINX to which the preceding side of
the IPL belongs, from the Point of view of the PINX to which the succeeding side of the IPL belongs.
4.3.23 preceding side: in the context of a call/connection using an IPL, the side that initiates call/connection
establishment over that IPL. (See Figure 1.)
4.3.24 public broadband ISDN (public B-ISDN): a public ISDN that offers ATM Services to its users and employs
ATM transmission and switching.
4.3.25 public integrated Services digital network (public ISDN): a network that provides to the general public a
range of different telecommunication Services using digital connections.
4.3.26 public narrow-band ISDN (public N-ISDN): a public ISDN that offers to the general public only 64 kbit/s-
based Services.
4
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ISO/IEC 13247: 1997(E)
0 ISO/IEC
4.3.27 side: the Protocol Control entity in a PINX at one end of an IPL.
4.3.28 signalling AAL (SAAL): the AAL used for the bi-directional transfer of layer 3 signalling information.
4.3.29 succeeding PINX: within the context of a callkonnection using an IPL, the PINX to which the succeeding side
of the IPL belongs, from the Point of view of the PINX to which the preceding side of the IPL belongs.
4.3.30 succeeding side: in the context of a callkonnection using an IPL, the opposite side from the side that initiates
callkonnection establishment over that IPL. (See Figure 1.)
4.3.31 terminating PINX: within the context of a callkonnection, the PINX to which the called user is attached. (See
Figure 1.)
4.3.32 transit PINX: within the context of a callkonnection, any PINX through which the calkonnection Passes,
excluding any Originating PINX, Terminating PINX, Incoming Gateway PINX or Outgoing Gateway PINX. (See
Figure 1.)
4.3.33 unexpected message: within the context of a particular Protocol Control state, a message that is recognized, but
for which no procedures are defined in 9.6 of this International Standard (or in any other Standard relating to B-QSIG to
which the PINX Claims conformance) for receipt in that Protocol Control state.
4.3.34 unrecognized information element: an information element received in a particular message which is not
specified as part of that message in clause 7 of this International Standard or in any other Standard relating to B-QSIG to
which the PINX Claims conformance (e.g., a Standard specifying generic procedures for supplementary Services).
NOTE 3. The handling of national/private information elements is outside the scope of this International Standard (see annex H).
4.3.35 unrecognized message: a message that is not specified in clause 7 of this International Standard or in any other
Standard relating to B-QSIG to which the PINX Claims conformance (e.g., a Standard specifling generic procedures for
supplementary Services).
NOTE 4, The handling of national/private messages is outside the scope of this International Standard (see annex H).
4.3.36 unspecified bit rate (UBR): an ATM Service category for which no traffit-related Service guarantees are
specified.
4.3.37 virtual channel: one of a number of multiplexed, bi-directional transfers of digital data provided by the ATM
layer across an Interface between two ATM switching Points.
4.3.38 virtual channel connection: a concatenation of virtual channels that extends between two Points where the
ATM adaptation layer is accessed.
Backward direction
Transit PINX
Originating PINX (succeeding PINX with respect to the Terminating PINX
or Incoming Gateway PINX Originating or Incoming Gateway PINX) or Outgoing Gateway PINX
(preceding PINX with (preceding PINX with respect to the (succeeding PINX with
respect to the Transit PINX) Terminating or Outgoing Gateway PINX) respect to the Transit PINX)
hter-PI NX Link Inter-PINX Link
/
Preceding Succeeding Preceding Suc
...
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