ISO/IEC 14474:1998

Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Functional requirements for static circuit-mode inter-PINX connections

This International Standard is a part of the functional requirements for the Private Integrated Services Network (PISN) and defines the functions and procedures that are required by Private Integrated Services Network exchanges (PINXs) and the intervening network (IVN) in order to establish Inter-PINX Connections (IPC). The IPC is used for the transfer of signalling and user information between PINXs. The Private Signalling System No.1 (PSS1) as defined in ISO/IEC 11572 and 11574 defines the signalling procedures and protocol for call control between PINXs at the Q reference point. These procedures are independent of the types of IVNs, called scenarios used to interconnect the PINXs. ISO/IEC TR14475 describes the use of various types of IVNs which provide the interconnections of PINXs. In order to connect a PINX to another PINX, mapping functions are required to adapt the specific interfaces at the C reference point to the application at the Q reference point. As such, mapping functions provide for physical adaptation to the interface at the C reference point. Mapping functions also provide for the mapping of user channels and signalling information at the Q reference point to the appropriate channels or time-slots at the C reference point. The C and Q reference points are defined in ISO/IEC 11579-1. The types of interfaces at the C reference point covered by this International Standard are: [1] 1544 kbit/s unstructured digital leased line [2] 1544 kbit/s structured digital leased line [3] 2048 kbit/s unstructured digital leased line [4] 2048 kbit/s structured digital leased line [5] 64 kbit/s unrestricted digital leased line [6] 1544 kbit/s ISDN Primary Rate user-network layer 1 interface [7] 2048 kbit/s ISDN Primary Rate user-network layer 1 interface [8] ISDN Basic Rate user-network layer 1 interface At the Q reference point the mappings provide a 64 kbit/s service for user channels and a packet mode service for the signalling channel. The applied mapping is a static mapping, i.e. there is a fixed relationship between user and signalling channels at the Q reference point and the timeslots of the interface at the C reference point. Any changes are subject to administrative actions. This International Standard specifies PINX mapping functions between the Q reference point and the C reference point for IVNs which provide either dedicated or semi-permanent, non-user activation, circuit-mode IPCs. The dedicated IPC is the connection permanently established, usually for the duration of a contractual period. The semi-permanent IPC is the connection whose resources are reserved for specified times during a contractual period. The semi-permanent IPC is established by management control with or without user activations. In this International Standard, the semi-permanent IPC established by management control with user activation is outside the scope. The IVN can be a dedicated physical link, dedicated transmission system or a cross connect system, or semi-permanent connection system. IVNs which include inverse mulitlexer techniques (e.g. channel aggregation in accordance with ISO/IEC 13871) are covered by this International Standard so far as they support one of the interfaces listed above. This International Standard also specifies mapping information. At both sides of the PINX, mapping information is required to administer the scenarios. This International Standard is applicable to PINXs which can be interconnected to form a Private Integrated Services Network (PISN) and which support signalling protocols at the Q reference point.

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé à intégration de services — Exigences fonctionnelles pour les connexions inter-PINX en mode circuit statique

General Information

• Status: Published
• Publication Date: 16-Dec-1998
• ICS: 33.040.35 - Telephone networks
• Technical Committee: ISO/IEC JTC 1/SC 6 - Telecommunications and information exchange between systems
• Drafting Committee: ISO/IEC JTC 1/SC 6/WG 1 - Physical and data link layers
• Current Stage: 9060 - Close of review
• Start Date: 04-Mar-2026

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 14474
First edition
1998-12-15
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network — Functional
requirements for static circuit-mode
inter-PINX connections
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé à intégration de services —
Exigences fonctionnelles pour les connexions inter-PINX en mode circuit
statique
Reference number
B C
ISO/IEC 14474:1998(E)

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ISO/IEC 14474:1998(E)
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 fields of mutual interest. Other international organizations,
governmental and non-governmental, 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 1. 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 14474 was prepared by Joint Technical Committee
ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and
information exchange between systems.
Annex A forms an integral part of this International Standard.
© ISO/IEC 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any
form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in
writing from the publisher.
ISO/IEC Copyright Office • Case postale 56 • CH-1211 Genève 20 • Switzerland
Printed in Switzerland
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INTERNATIONAL STANDARD  © ISO/IEC ISO/IEC 14474:1998(E)
Information technology — Telecommunications and information exchange
between systems — Private Integrated Services Network — Functional
requirements for static circuit-mode inter-PINX connections
1. Scope
This International Standard is a part of the functional requirements for the Private Integrated Services Network (PISN)
and defines the functions and procedures that are required by Private Integrated Services Network exchanges (PINXs)
and the intervening network (IVN) in order to establish Inter-PINX Connections (IPC). The IPC is used for the transfer
of signalling and user information between PINXs.
The Private Signalling System No.1 (PSS1) as defined in ISO/IEC 11572 and 11574 defines the signalling procedures
and protocol for call control between PINXs at the Q reference point. These procedures are independent of the types of
IVNs, called scenarios used to interconnect the PINXs. ISO/IEC TR14475 describes the use of various types of IVNs
which provide the interconnections of PINXs.
In order to connect a PINX to another PINX, mapping functions are required to adapt the specific interfaces at the C
reference point to the application at the Q reference point. As such, mapping functions provide for physical adaptation
to the interface at the C reference point. Mapping functions also provide for the mapping of user channels and
signalling information at the Q reference point to the appropriate channels or time-slots at the C reference point. The C
and Q reference points are defined in ISO/IEC 11579-1.
The types of interfaces at the C reference point covered by this International Standard are:
[1] 1544 kbit/s unstructured digital leased line
[2] 1544 kbit/s structured digital leased line
[3] 2048 kbit/s unstructured digital leased line
[4] 2048 kbit/s structured digital leased line
[5] 64 kbit/s unrestricted digital leased line
[6] 1544 kbit/s ISDN Primary Rate user-network layer 1 interface
[7] 2048 kbit/s ISDN Primary Rate user-network layer 1 interface
[8] ISDN Basic Rate user-network layer 1 interface
At the Q reference point the mappings provide a 64 kbit/s service for user channels and a packet mode service for the
signalling channel. The applied mapping is a static mapping, i.e. there is a fixed relationship between user and
signalling channels at the Q reference point and the timeslots of the interface at the C reference point. Any changes are
subject to administrative actions.
This International Standard specifies PINX mapping functions between the Q reference point and the C reference point
for IVNs which provide either dedicated or semi-permanent, non-user activation, circuit-mode IPCs. The dedicated IPC
is the connection permanently established, usually for the duration of a contractual period. The semi-permanent IPC is
the connection whose resources are reserved for specified times during a contractual period. The semi-permanent IPC is
established by management control with or without user activations. In this International Standard, the semi-permanent
IPC established by management control with user activation is outside the scope.
The IVN can be a dedicated physical link, dedicated transmission system or a cross connect system, or semi-permanent
connection system. IVNs which include inverse mulitlexer techniques (e.g. channel aggregation in accordance with
ISO/IEC 13871) are covered by this International Standard so far as they support one of the interfaces listed above.
This International Standard also specifies mapping information. At both sides of the PINX, mapping information is
required to administer the scenarios.
This International Standard is applicable to PINXs which can be interconnected to form a Private Integrated Services
Network (PISN) and which support signalling protocols at the Q reference point.
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ISO/IEC 14474:1998(E) © ISO/IEC
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
The following standards contain provisions which, through reference in this text, constitute provisions of this
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.
[1] ISO/IEC 11579-1:1994, Information technology — Telecommunications and information exchange between
systems — Private integrated services network — Part1: Reference configuration for PISN Exchanges (PINX).
[2] ISO/IEC TR 14475:1996, Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Network — Architecture and Scenarios for Private Integrated Services
Networking.
[3] 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.
[4] ISO/IEC 11574:1994, Information technology — Telecommunications and information exchange between systems
— Private Integrated Services Network — Circuit-mode 64 kbit/s bearer services — Service description,
functional capabilities and information flows.
[5] ITU-T Rec.G.703 (1991), Physical/electrical characteristics of hierarchical digital interface.
[6] ITU-T Rec.G.704 (1995), Synchronous frame structures used at primary and secondary hierarchical levels.
[7] ITU-T Rec.G.706 (1991), Frame alignment and cyclic redundancy check (CRC) procedures relating to basic
frame structures defined in Recommendation G.704.
[8] ITU-T Rec.I.431 (1993), Primary rate user-network interface — Layer 1 specification.
[9] ITU-T Rec.I.430 (1995), Basic rate user-network interface — Layer 1 specification.
[10] ITU-T Rec.I.412 (1988), ISDN user-network interfaces — Interface structures and access capabilities.
[11] ITU-T Rec.I.140 (1993), Attribute Technique for the characterization of Telecommunication Services supported
by an ISDN and Network Capabilities of an ISDN.
[12] ITU-T Rec.I.210 (1993), Principles of Telecommunication Services Supported by and ISDN and the Means to
describe them.
[13] ITU-T Rec.Q.921 (1993), ISDN User-Network Interface — Layer 2 specification.
1)
[14] ISO/IEC 2382-36:— , Information technology — Vocabulary — Part 36: Private Integrated Services Network.
[15] ISO/IEC 13871:1995, Information technology — Telecommunications and information exchange between systems
— Private telecommunications networks — Digital channel aggregation.

1) To be published.
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© ISO/IEC ISO/IEC 14474:1998(E)
4. Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 External definitions
- PISN (Private Integrated Services Network) [14]
- PINX (Private Integrated Services Network Exchange) [14]
- IVN (Intervening Network) [14]
- SW (Switching Functional grouping) [1]
- MP (Mapping Functional grouping) [1]
- Q Reference Point [1]
- C Reference Point [1]
- IPC (Inter-PINX Connection) [14]
- IPL (Inter-PINX Link) [14]
4.2 Specific Definitions
4.2.1 Channel
A means of bi-directional transmission of user or signalling information between two points.
4.2.1.1 Dq channel
A channel used to convey signalling information including call control information between the Q reference points of
two peer PINXs.
4.2.1.2 Uq channel
A channel used to convey user information between the Q reference points of two PINXs.
4.2.2 Signalling Functions
4.2.2.1 QSIG (Signalling information flow at the Q reference point)
The generic term describing the signalling information flows (i.e. not a specific signalling protocol), within a Dq
channel.
4.2.2.2 CSIG (Signalling information flow at the C reference point)
The generic term describing access signalling information flows (i.e. not a specific signalling protocol), between a PINX
and an IVN, at the C reference point.
4.3 Symbols and Abbreviations
- B Timeslot providing of 64 kbit/s bearer capability
- C C Reference Point
- Dq Dq channel
- IPC Inter-PINX Connection
- IVN Intervening Network
- MP Mapping Functional grouping
- PINX Private Integrated Services Network Exchange
- Q Q Reference Point
- QAB Indicates a Q reference point that is associated with the interconnection between PINX A and B
- QAC Indicates a Q reference point that is associated with the interconnection between PINX A and C.
- SW Switching Functional grouping
- Uq Uq channel
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ISO/IEC 14474:1998(E) © ISO/IEC
5. Introduction
For the concept of mapping function reference is made to ISO/IEC TR 14475[2].
5.1 Type of IVN
The IVNs supporting permanent circuit-mode IPCs are as follows:
¤Dedicated Transmission System
¤Semi Permanently established channels of circuit-mode network
5.1.1 Dedicated Transmission System
The IPC is provided by a transmission mechanism. The IPC is established by management, see Figure 5.1.
PINX PINX
Physical Medium
nUq+Dq nUq+Dq
MP MP
Q CC Q
Figure 5.1 — Dedicated Physical medium
The transmission Medium can provide unstructured or channelized bitstream.
5.1.2 Semi-Permanent Connection
The dedicated or the semi-permanent IPCs are provided by a semi-permanent circuit-mode mechanism in the intervening
network, in which the IPCs are permanently established by management control with or without user activation. The
channels on an IPC (signalling and user information channels between associated two PINXs) at the Q reference point
are mapped onto preassigned timeslots providing of 64 kbit/s bearer capability of the IVN access at the C reference
point.
This scenario provides multiple IPCs leading to different PINXs.
C
PINX A PINX B
Q mU +D
AB Q QAB
IVN MP
C
mU +D
Q QAB
(m+1)B Q
AB
nU +D MP X
Q QAC
C
PINX C
(m+n+2)B nU +D
Q QAC
MP
Q
AC
Q
AC
(n+1)B
Figure 5.2 — Semi-permanent Connection
5.2 IVN Interface types
The Table 1 shows the categorization of the scenario type of permanent circuit-mode inter-PINX connections. It
categorizes the IVN types in terms of the characteristics of the digital leased line for the provision of IPC. IVN interface
types are only standardized in certain regions. The international availability of the full bit stream is outside the scope of
this International Standard.
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© ISO/IEC ISO/IEC 14474:1998(E)
Table 5.1 — IVN Interface Types
IVN Interface Types Structurization Note
1 Unstructured 1544 kbit/s digital leased line -
2 Structured 1544 kbit/s digital leased line 1536 kbit/s timeslots Note 1
3 Structured 1544 kbit/s digital leased line 24 x 64 kbit/s timeslots Note 3
4 Unstructured 2048 kbit/s digital leased line 1984 kbit/s timeslots
5 Structured 2048 kbit/s digital leased line 1984 kbit/s timeslots Note 2
6 Structured 2048 kbit/s digital leased line 31 x 64 kbit/s timeslots Note 3
7 64 kbit/s digital leased line 64 kbit/s timeslot
8 ISDN1544kbit/s Primary Rate Interface According to ITU-T Rec.I.431
9 ISDN 2048kbit/s Primary Rate Interface According to ITU-T Rec.I.431
10 ISDN Basic Rate Interface According to ITU-T Rec.I.430
Note 1:
This type of leased line that is used to interconnect PINXs is a digital transmission link providing primary rate (1544
kbit/s) capability. In this mapping type, the derived channel at the Q reference point shall be mapped onto the time
slot the information transfer rate of which is at 64 kbit/s without alteration between the PINXs.
Note 2:
In Europe and Australia it is possible to get 2048 kbit/s leased lines in two different ways. Alternative 1 is
unstructured version, which provides unstructured bit stream at 2048 kbit/s (there is no channelisation). Alternative 2
is a channelized version in which time slot 0 is not necessarily transparent. Normally however the leased line offers
the remaining 31 channels so that they can be used as 1984 kbit/s or as 31 x 64 kbit/s.
For the case of an unstructured leased line, it should be considered as one IPC at 2048 kbit/s. One possible mapping
is to map it to 31 x 64 kbit/s channels. For the structured case especially when used with a cross connect the interface
should be considered as providing 31 IPCs cash at 64 kbit/s.
Note 3:
It is a make of subscription, while all 64 kbit/s timeslots are though connected end-to-end. Timeslot sequence
integrity is guranteed.
5.3 IPC Bearer Capabilities
IPC Bearer Capabilities depend on IVN Interface describing in the table below.
In each IVN types, the bearer capabilities shall be the assume in both PINXs for any given channel at the Q reference
point. While, as a default solution, the bearer capabilities of any given channel at the Q reference point may be the same
as provided by the IVN, the channels offered to the Q reference point can have deferent bearer capabilities provided by
the IVN. The bearer modification function allows for conditioning the bearer capabilities provided by the IVN,
depending on the bearer capabilities desired at the Q reference point. This bearer modification function is outside the
scope of this International Standard.
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ISO/IEC 14474:1998(E) © ISO/IEC
Table 5.2 — IPC Bearer Capabilities (Structured 1544 kbit/s)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate -
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity Note 2
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable Note 1
Information Transfer Coding
Note 1:
While coding for speech and 3.1 kHz audio are given as a route attribute, it is the responsibility of PISN users to
ensure that a compatible encoding scheme such as A/m low coding. PISN users should also recognize no network
provision can be made for control of echo and loss.
Note 2:
There are cases the IVNs may use processing technique appropriate for speech such as analogue transmission, echo
cancellation and low bit rate voice encoding, hence the bit integrity is not assured.
Table 5.3 — IPC Bearer Capabilities (Structured 1544 kbit/s, 1536 kbit/s timeslots)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 1536 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity Note 2
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable Note 1
Information Transfer Coding
Note 1:
While coding for speech and 3.1 kHz audio are given as a route attribute, it is the responsibility of PISN users to
ensure that a compatible encoding scheme such as A/m low coding. PISN users should also recognize no network
provision can be made for control of echo and loss.
Note 2:
There are cases the IVNs may use processing technique appropriate for speech such as analogue transmission, echo
cancellation and low bit rate voice encoding, hence the bit integrity is not assured.
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© ISO/IEC ISO/IEC 14474:1998(E)
Table 5.4 — IPC Bearer Capabilities (Structured 1544 kbit/s, 24 x 64 kbit/s channels)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 1536 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
Table 5.5 — IPC Bearer Capabilities (Unstructured 2048 kbit/s, 1984 kbit/s timeslots)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 1984 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
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ISO/IEC 14474:1998(E) © ISO/IEC
Table 5.6 — IPC Bearer Capabilities (Structured 2048 kbit/s, 1984 kbit/s timeslots)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 1984 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
Table 5.7 — IPC Bearer Capabilities (Structured 2048 kbit/s, 31 x 64 kbit/s timeslots)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate N x 64 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
Point-to-Multipoint
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
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© ISO/IEC ISO/IEC 14474:1998(E)
Table 5.8 — IPC Bearer Capabilities (64 kbit/s, 64 kbit/s timeslot)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 64 kbit/s
3 IPC Bearer Capability Unrestricted digital information
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
Table 5.9 — IPC Bearer Capabilities (ISDN 1544 kbit/s Primary Rate User-Network Layer 1 Interface)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 64 kbit/s up to 24 IPCs
3 IPC Bearer Capability Unrestricted digital information e.g. unrestricted
digital speech
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
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ISO/IEC 14474:1998(E) © ISO/IEC
Table 5.10 — IPC Bearer Capabilities (ISDN 2048 kbit/s Primary Rate User-Network Layer 1 Interface)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate 64 kbit/s up to 31 IPCs
3 IPC Bearer Capability Unrestricted digital information e.g. unrestricted
digital speech
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
Table 5.11 — IPC Bearer Capabilities (ISDN Basic Rate User-Network Layer 1 Interface)
Attribute Attribute Values Note
1 IPC Information Transfer Mode Circuit
2 IPC Information Transfer Rate Note 1
3 IPC Bearer Capability Note 1
4 Establishment of Connection Semi-Permanent
Permanent
5 Symmetry Bi-directional symmetric
6 Connection Configuration Point-to-Point
7 Structure 8 kHz integrity
Time slot sequence integrity
8 Channel Type Not Applicable
9 Connection Control Protocol Not Applicable
Information Transfer Coding
Note 1:
When the IVN supports the D-channel end-to-end then 3 IPCs are provided at the C reference point.
One IPC has the following attribute values;
- Information Transfer Tate : 16 kbit/s
- Transfer Capability : unrestricted digital information
Two IPCs have the following attribute values;
- Information Transfer Rate : 64 kbit/s
- Transfer Capability : according to subscription
When the IVN does not support the D-channel end-to-end then 2 IPCs are provided at the C reference point with the
following attribute values;
- Information Transfer Rate : 64 kbit/s
- Transfer Capability : according to subscription
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© ISO/IEC ISO/IEC 14474:1998(E)
6. Mapping Functions
6.1 Physical Adaptation
This section specifies the physical termination of the IVN interfaces.
6.1.1 Unstructured 1554 kbit/s Digital Leased Line
The IVN provides structured bit stream at 1544 kbit/s with no channelisation at the physical interface. The transmission
at the physical layer is provided by the transmission system operation at the rate of 1544 kbit/s.
The mapping functions shall be able to provide the followings in accordance with ITU-T Recommendations:
ITU-T Rec.G.704 shall be applied to the definition of the frame structure at the interface of 1544 kbit/s, including the
frame format at the interface. The physical adaptation of the mapping function shall be able to provide a 8 kHz frame
structure in accordance with ITU-T Rec.G.704, clauses 2.1.1 and 2.1.3.
ITU-T Rec.G.706, clauses 2.1.1 and 2.1.2 shall be applied to the definition of the frame alignment procedures at the
interface of 1544 kbit/s.
ITU-T Rec.G.703, clause 2 shall be applied to the definition of the physical and electrical characteristics at the interface
of 1544 kbit/s.
The provision of a synchronization clock to the dedicated transmission system is outside the scope of this International
Standard.
Timeslots 1 to 24 shall be used for IPCs using this type of IVN, each IPC with the following bearer capability shown in
Table 2.
6.1.2 Structured 1544 kbit/s (1536 kbit/s timeslots) Digital Leased Line
The IVN provides a structured bit stream at 1544 kbit/s with channelisation at the physical interface. The transmission
at the physical layer is provided by the transmission system operation at the rate of 1544 kbit/s.
The mapping functions shall be able to provide the followings in accordance with ITU-T Recommendations:
ITU-T Rec.G.704 shall be applied to the definition of the frame structure at the interface of 1544 kbit/s, including the
frame format at the interface. The physical adaptation of the mapping function shall be able to provide a 8 kHz frame
structure of 24 timeslots (numbered from 1 to 24) in accordance with ITU-T Rec.G.704, clauses 2.1.1 and 2.1.2.
ITU-T Rec.G.706, clauses 2.1.1 and 2.1.2 shall be applied to the definition of the frame alignment procedures at the
interface of 2048 kbit/s.
ITU-T Rec.G.703, clause 2 shall be applied to the definition of the physical and electrical characteristics at the interface
of 1544 kbit/s.
The provision of a synchronization clock to the dedicated transmission system is outside the scope of this International
Standard.
Timeslots 1 to 24 shall be used for IPCs using this type of IVN, each IPC with the following bearer capability shown in
Table 5.2, where timeslots 0 shall be used to carry the information described in ITU-T Rec.G.704.
6.1.3 Structured 1554 kbit/s (24 x 64 kbit/s timeslots) Digital Leased Line
The IVN provides the bit stream at 1544 kbit/s with channelisation of 24 channels of 64 kbit/s each at the physical
interface. The transmission at the physical layer is provided by the transmission system operation at the rate of 1544
kbit/s.
The mapping functions shall be able to provide the followings in accordance with ITU-T Recommendations:
ITU-T Rec.G.704 shall be applied to the definition of the frame structure at the interface of 1544 kbit/s, including:
- the frame format at the interface
- number of bits per 64 kbit/s channel time slot
- number of 64 kbit/s channel time slot
- use of 64 kbit/s channel time slot
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ISO/IEC 14474:1998(E) © ISO/IEC
The physical adaptation of the mapping function shall be able to provide a 8 kHz frame structure in accordance with
ITU-T Rec.G.704, clauses 2.1.1 and 2.1.3. The physical adaptation shall, according to ITU-T Rec.G.704 clauses
3.1.1.1 and 3.1.1.2, distinguish 24 timeslots of 192 bits. Timeslots shall be numbered from 1 to 24. Each timeslot shall
consist of 8 bits.
Timeslots 1 to 24 shall be used for 24 channels, each channel with the following bearer capabilities:
- information transfer capability, unrestricted digital information
- information transfer rate: 64 kbit/s
If a Dq channel is mapped onto the interface at the C reference point, the allocation of a time slot is not specified.
ITU-T Rec.G.706, clause 2.1.1 and 2.1.2 shall be applied to the definition of the frame alignment procedures at the
interface of 1544 kbit/s.
ITU-T Rec.G.703, clause 2 shall be applied to the definition of the physical and electrical characteristics at the interface
of 1544 kbit/s.
The provision of a synchronization clock to the dedicated transmission system is outside the scope of this International
Standard.
6.1.4 Unstructured 2048 kbit/s Digital Leased Line
The IVN provides unstructured bit stream at 2048 kbit/s with no channelisation at the physical interface. The
transmission at the physical layer is provided by the transmission system operation at the rate of 2048 kbit/s.
The mapping functions shall be able to provide the followings in accordance with ITU-T Recommendations:
ITU-T Rec.G.704 shall be applied to the definition of the frame structure at the interface of 2048 kbit/s, including the
frame format at the interface. The physical adaptation of the mapping function shall be able to provide a 8 kHz frame
structure of 32 timeslots (numbered from 0 to 31) in accordance with ITU-T Rec.G.704, clauses 2.3.1 and 2.3.2.
ITU-T Rec.G.706, clauses 4.1.1 and 4.1.2 shall be applied to the definition of the frame alignment procedures at the
interface of 2048 kbit/s.
ITU-T Rec.G.703, clause 6 shall be applied to the definition of the physical and electrical characteristics at the interface
of 2048 kbit/s.
The provision of a synchronization clock to the dedicated transmission system is outside the scope of this International
Standard.
Timeslots 1 to 31 shall be used for IPCs using this type of IVN, each IPC with the following bearer capability shown in
Table 5.5, where timeslots 0 shall be used to carry the information described in ITU-T Rec.G.704.
Note: In some countries, timeslot 0 might be used for an IPC using this type of IVN.
6.1.5 Structured 2048 kbit/s (1984 kbit/s timeslots) Digital Leased Line
The IVN provides a structured bit stream at 2048 kbit/s with channelisation at the physical interface. The transmission
at the physical layer is provided by the transmission system operation at the rate of 2048 kbit/s.
The mapping functions shall be able to provide the followings in acco
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