SIST ETS 300 405 E1:2003

• Abstract:

  Describes the architecture of the GSM Operation and Maintenance (O&M) object registration.

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 35.110 - Networking
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI ETS 300 405 ed.1 (1995-02) - Network Aspects (NA); Metropolitan Area Network (MAN); Interconnection of MAN Switching Systems (MSS) based on an Asynchronous Transfer Mode (ATM) interface

SIST ETS 300 405 E1:2003 is the Slovenian identical adoption of ETS 300 405 Edition 1, published by SIST. It specifies how Metropolitan Area Network (MAN) Switching Systems (MSS) interconnect over an Asynchronous Transfer Mode (ATM) interface, including the Connectionless Network Interface (CLNI), for telecom operators and engineers who design, implement, or manage MAN interconnection. The document defines the reference configuration, functional blocks, protocol model, and management functions used to carry connectionless service between MSSs.

What does SIST ETS 300 405 E1:2003 specify?

SIST ETS 300 405 E1:2003 specifies the interconnection of European standard MANs through an ATM-based network. It focuses on MSS-to-MSS interconnection and on the CLNI between the MSS and the ATM-based network.

The document is limited to MSS interconnection when MAN users use the Connectionless Broadband Data Service (CBDS). It also covers the case where the MSS and the ATM-based network are in the same network operator domain or in different Public Telecommunication Operator (PTO) domains. Other MAN services and direct MAN interconnection using the Dual Queue Dual Bus (DQDB) protocol are outside this document’s subject.

The standard is organised into:

• Scope
• Normative references
• Definitions and abbreviations
• Vocabulary
• Reference configuration
• CLNI requirements
• Functional architecture
• Protocol reference model for ATM-based MSS interconnection
• Annex A and Annex B

Annex	What it covers
Annex A	Interaction between the AMF and ATAF blocks inside an MSS
Annex B	Bibliography

What are the key requirements of SIST ETS 300 405 E1:2003?

SIST ETS 300 405 E1:2003 defines how connectionless data moves between MSSs and an ATM-based network, and it fixes the functional split inside the MSS and the transit network. In practice, this tells implementers what the interface must do, how addressing and routing work, and which management functions support the link.

CLNI behaviour and service handling

Clause 6 says the CLNI must support the service at the User-MAN Interface (UMI) and preserve the sequence integrity of connectionless data units between MSSs. That matters because users expect the same order of delivery end to end, even when traffic crosses an ATM-based transport network.

The interface uses hierarchical CCITT Recommendation E.164 numbering for routing and supports both individually addressed and group addressed data units. For operators, that means address planning and group handling are part of the interconnection design.

Encapsulation and non-encapsulation

Clause 6 allows two forwarding methods across the CLNI: encapsulation of the Initial Media access control PDU (IMPDU) into the Connectionless Network Interface Protocol (CLNIP) PDU, or non-encapsulation. The Protocol Identifier (PI) in the CLNIP-PDU header tells the receiving side which method was used.

For network operators, the rule is simple in practice: network nodes must be able to decapsulate encapsulated data and also forward non-encapsulated data. The standard also says network operators may choose encapsulation or non-encapsulation within a single domain, while inter-operator applications use encapsulation.

Functional blocks in the transit network and MSS

Clause 7.1 defines the Transit Connection Related Function (TCRF) as the transit-network part that handles address handling and routing. It uses ATM switched capabilities and may include Connectionless Service Functions (CLSF), so implementers know where connectionless service logic sits in the overall network.

Clause 7.2 and 7.3 divide the MSS side into Management Functions (MMF) and Transit Access Termination (TAT), with TAT further split into ATM Transit Access Function (ATAF) and ATM Mapping Functions (AMF). This split matters because it separates management, adaptation, and routing tasks into distinct blocks.

Address handling, routing, and virtual paths

Clause 7.3 shows that the AMF and its Address look-up Module, Routeing Module, and Forwarding/Receiving Module cooperate to resolve addresses and select the appropriate Virtual Path Connection (VPC). In practice, this is the part that determines how each data unit is mapped to the right path through the ATM network.

Management functions

Clause 7.4 adds ATM-based MSS Interconnection Management Functions (AMIMF). These functions cover protocol layer management for ATAF, operational handling for AMF, traffic statistics, internal routing and congestion management, charging-related functions between operator domains, and virtual path management. That gives operators the management hooks needed to run the interconnection day to day.

Protocol reference model

Clause 8 defines the Protocol Reference Model (PRM) for CLNI as physical, ATM, ATM Adaptation Layer type 3/4 (AAL 3/4), and CLNIP layers. This matters because it tells implementers exactly which B-ISDN layers are in play at the interface.

What terms does SIST ETS 300 405 E1:2003 define?

• CLNI - The ATM-based interface used to interconnect MSS and ATM-based networks, whether they belong to the same or to different operator domains.
• MSS - A MAN Switching System, the switching element used in the MAN interconnection model.
• TCRF - The transit-network function that handles address handling and routing, and may include CLSF.
• TAT - The Transit Access Termination inside an MSS that terminates the transit link at the P reference point.
• AMF - The ATM Mapping Functions block, which performs mapping and address-related processing between MSS traffic and the CLNI.
• ATAF - The ATM Transit Access Function block, which receives and transmits information over the ATM-based medium.
• AMIMF - The ATM-based MSS Interconnection Management Functions that manage ATAF, AMF operations, statistics, and path management.
• CLS - A Connectionless Server that can provide CLSF within the ATM-based network.

Who uses SIST ETS 300 405 E1:2003?

SIST ETS 300 405 E1:2003 is used by telecom network operators, public telecommunication operators, and equipment vendors working on MAN interconnection. It is also relevant to network architects, protocol engineers, and operations teams that need to design, configure, test, or manage MSS connections over ATM.

In practice, it supports tasks such as interface design, routeing and address planning, implementation of CLNI behaviour, and management of virtual paths and traffic statistics.

Which standards are used with SIST ETS 300 405 E1:2003?

The document relies on several referenced standards and companion parts:

• CCITT Recommendation E.164 - supplies the hierarchical numbering plan used for routeing.
• CCITT Recommendation I.113 - provides B-ISDN vocabulary.
• CCITT Recommendation I.321 - gives the B-ISDN protocol reference model used for the interface and management plane.
• ETS 300 211 - defines MAN principles and architecture, including MSS, TAT, TCRF, and the broader service model.
• ETS 300 217 - defines CBDS, which is the service context for this interconnection.
• ETS 300 275 - covers direct MAN interconnection using DQDB.
• ETR 122 - defines CLNIP and the encapsulation mechanism used on the interface.
• ITU-T Recommendations I.150, I.361, I.362, I.363, I.327, I.432 - provide ATM, AAL, and physical-layer background for the interface.

What does the SIST ETS 300 405 E1:2003 document contain?

The document contains a reference configuration figure for MSS interconnection, functional descriptions of the TCRF, MSS, TAT, ATAF, AMF, RM, and FRM blocks, and a protocol reference model for CLNI. It also includes an informative annex that explains how AMF and ATAF exchange control information and data in both transmission and reception.

Annex A is practical for implementers because it describes the parameters exchanged between the blocks and how they are used to build or recover a CLNIP-PDU. Annex B gives the bibliography for related background reading.

SLOVENSKI STANDARD
01-december-2003
2PUHåQLYLGLNL1$±9HOHPHVWQRRPUHåMH0$1±0HGVHERMQRSRYH]RYDQMH
NRPXWDFLMVNLKVLVWHPRYYRPUHåMX0$1006SUHNYPHVQLND]DDVLQKURQL
SUHQRVQLQDþLQ$70
Network Aspects (NA); Metropolitan Area Network (MAN); Interconnection of MAN
Switching Systems (MSS) based on an Asynchronous Transfer Mode (ATM) interface
Ta slovenski standard je istoveten z: ETS 300 405 Edition 1
ICS:
35.110 Omreževanje Networking
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

UROPEAN ETS 300 405
E
ELECOMMUNICATION February 1995
T
TANDARD
S
Source: ETSI TC-NA Reference: DE/NA-052104
ICS: 33.080
MAN, interconnection, ATM
Key words:
Network Aspects (NA);
Metropolitan Area Network (MAN)
Interconnection of MAN Switching Systems (MSS)
based on an Asynchronous Transfer Mode (ATM) interface
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: 06921 Sophia Antipolis Cedex - FRANCE
Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
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 1995 rights reserved.
New presentation - see History box

Page 2
ETS 300 405: February 1995
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 Standards Approval Dept." at the address shown on the title page.

Page 3
ETS 300 405: February 1995
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Vocabulary.9
5 Reference configuration .9
6 CLNI requirements .10
7 Functional architecture.11
7.1 Transit connection related functions.11
7.2 MSS .12
7.3 TAT .12
7.4 ATM-based MSS interconnection management functions .15
8 Protocol reference model for ATM-based MSS interconnection.15
Annex A (informative): Interaction between the AMF and the ATAF blocks .16
Annex B (informative): Bibliography.17
History.18

Page 4
ETS 300 405: February 1995
Blank page
Page 5
ETS 300 405: February 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
The purpose of Metropolitan Area Network (MAN) interconnection is to enable users connected to
different MANs using the same connectionless bearer service to communicate with each other.
MANs are based upon a shared medium access and cover a restricted geographical area. In order to
cover larger areas, MAN Switching System (MSS) interconnection is needed.
MSSs can be interconnected via an Asynchronous Transfer Mode (ATM) based network composed of
semi-permanent/permanent Virtual Path Connections (VPCs) and which comprises only ATM
crossconnects and possibly Connectionless Servers (CLSs).
This ETS gives the functional definition of the interface between MSS and ATM-based network. The
defined interface includes functionalities to support the interconnection of MSS and ATM-based network in
the case in which the two networks belong to the same network operator domain and in the case in which
they belong to different ones.

Page 6
ETS 300 405: February 1995
Blank page
Page 7
ETS 300 405: February 1995
1 Scope
This European Telecommunication Standard (ETS) describes the interconnection between European
standard Metropolitan Area Networks (MANs) by means of an Asynchronous Transfer Mode (ATM) based
network. Connectionless service is provided directly or indirectly, according to ITU-T
Recommendation I.327 [9]. ATM connections are to be established through ATM crossconnects between
the user and Connectionless Servers (CLSs).
Direct interconnection of MANs, based on the Dual Queue Dual Bus (DQDB) protocol is specified in
ETS 300 275 [6].
This ETS is restricted to the interconnection of MAN Switching Systems (MSSs) when the MAN users use
the Connectionless Broadband Data Service (CBDS) as defined in ETS 300 217 [5]. CBDS may be
provided by both types of networks (MAN and ATM-based). The requirements to allow communication
between users connected to a MAN and users connected to an ATM-based network, both providing
CBDS, is outside the scope of this ETS.
The interconnection of MSSs via ATM connections when MAN users use other services as defined in
ETS 300 211 [4] is outside the scope of this ETS.
The defined interface applies to the case in which the MSS and the ATM-based network belong to the
same network operator domain and to the case in which they belong to different ones, assuming as basis
ETS 300 211 [4] and CCITT Recommendation I.321 [3]. The basic data transfer functionalities at the
interface are the same for the two cases. Additional specific management functionalities may be required
for each case.
This ETS provides the general principles and functional requirements and specifies the corresponding
interface for interconnection of MSSs.
The specification of the interface between MSS and the ATM-based network is based on the Network
Node Interface (NNI) and takes into account ITU-T Recommendations I.150 [7], I.361 [10], I.362 [11],
I.363 [12], and I.327 [9], ETS 300 275 [6] and ETR 122.
This ETS defines the reference configuration, functional blocks and their corresponding Protocol
Reference Models (PRMs) related to MSS interconnection.
2 Normative references
This ETS incorporates by dated and 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] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[2] CCITT Recommendation I.113 (1993): "Vocabulary of terms for broadband
aspects of ISDN".
[3] CCITT Recommendation I.321 (1991): "B-ISDN protocol reference model and
its application".
[4] ETS 300 211 (1992): "Network Aspects (NA); Metropolitan Area Network (MAN)
Principles and architecture".
[5] ETS 300 217 (1992): "Network Aspects (NA); Connectionless Broadband Data
Service (CBDS)".
[6] ETS 300 275 (1994): "Network Aspects (NA); Metropolitan Area Network (MAN)
Interconnection of MANs".
Page 8
ETS 300 405: February 1995
[7] ITU-T Recommendation I.150 (1993): "B-ISDN asynchronous transfer mode
functional characteristics".
[8] ITU-T Recommendation I.311 (1993): "B-ISDN general network aspects".
[9] ITU-T Recommendation I.327 (1993): "B-ISDN functional architecture".
[10] ITU-T Recommendation I.361 (1993): "B-ISDN ATM layer specification".
[11] ITU-T Recommendation I.362 (1993): "B-ISDN ATM adaptation layer (AAL)
functional description".
[12] ITU-T Recommendation I.363 (1993): "B-ISDN ATM adaptation layer
specification".
[13] ITU-T Recommendation I.432 (1993): "B-ISDN user network interface - Physical
layer specification".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
ATM crossconnect: This can be either VP cross-connect or VC cross-connect (see
ITU-T Recommendation I.311 [8]).
ATM Mapping Functions (AMF) block: The AMF block contains the mapping functionality.
ATM Transit Access Functions (ATAF) block: The ATAF block contains functions to receive and
transmit information over a medium. It is based on ATM.
ATM-based MSS Interconnection Management Functions (AMIMF) functional component: This
includes the management functions relevant to the handling of the Connectionless Network Interface
(CLNI).
Connectionless Network Interface Protocol (CLNIP): See ETR 122.
Connectionless Server (CLS): See ETR 122.
MAN Switching System (MSS): See ETS 300 211 [4].
Connectionless Network Interface (CLNI): An ATM-based interface for the interconnection of MSS and
ATM-based networks belonging to the same or to different network operator domains.
MSS Management Functions (MMF) block: See ETS 300 275 [6].
reference point Ym: See ETS 300 211 [4] (note).
NOTE: The reference point Ym is not defined in CCITT or ITU-T Recommendations.
Transit Access Termination (TAT): See ETS 300 211 [4].
Transit Connection Related Function (TCRF): See ETS 300 211 [4] and ITU-T
Recommendation I.327 [9].
Page 9
ETS 300 405: February 1995
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AAL 3/4 ATM Adaptation Layer type 3/4
AF Access Facility
AM Address look-up Module
AMF ATM Mapping Functions
AMIMF ATM-based MSS Interconnection Management Functions
ATAF ATM Transit Access Function
CEQ Customer Equipment
CLNI Connectionless Network Interface
CLNIP Connectionless Network Interface Protocol
CLS Connectionless Server
CLSF Connectionless Service Functions
FRM Forwarding/Receiving Module
IMPDU Initial Media access control PDU
MAN Metropolitan Area Networks
MMF MSS Management Functions
MSS MAN Switching System
NNI Network Node Interface
OAM Operations And Maintenance
PDU Protocol Data Unit
PI Protocol Identifier
PRM Protocol Reference Model
PTO Public Telecommunication Operator
RM Routeing Module
QoS Quality of Service
TAT Transit Access Termination
TCRF Transit Connection Related Function
TL Transmission Link
UMI User-MAN Interface
VPC Virtual Path Connection
4 Vocabulary
For B-ISDN related terms and definitions, see CCITT Recommendation I.113 [2].
5 Reference configuration
The reference configuration for the interconnection of MSSs via an ATM-based network is depicted in
Figure 1.
T
T Y
Y P P
M M M M
TCRF
CEQ TL TL MSS AF CEQ
AF (ATM
MSS
based)
CLNI CLNI
CEQ: Customer Equipment
AF: Access Facility
TL: Transmission Link
Figure 1: Reference configuration for MSS interconnection
The CLNI is located at the P reference point.
The CLNI is defined for the two cases of interconnection identified in clause 6.

Page 10
ETS 300 405: February 1995
6 CLNI requirements
The characteristics of the interface CLNI between MSS and the ATM-based network support the service
provided at the User-MAN Interface (UMI), described in ETS 300 217 [5].
The interconnection of MSSs via an ATM-based network allows the transparent transfer of connectionless
data units between P reference points of different MSSs connected to the ATM-based network. The
connectionless data unit sequence integrity is preserved between MSSs to maintain the sequence order
between end users.
The routeing of connectionless data units is based on the hierarchical CCITT Recommendation E.164 [1]
number. Both individual and group addressed data units transport handling is provided at the interface.
The defined interface (CLNI) is applicable in two cases: the MSS and the ATM-based network belong to
the same network operator, or they belong to different Public Telecommunication Operators (PTOs). In
the first case additional functions for internal routeing and congestion management may be supported; in
the second one operational functions related to the interconnection of networks managed by different
PTOs may be provided.
Two techniques are allowed to forward/receive the data units across the CLNI interface: encapsulation of
the IMPDUs defined at the Ym reference points within the CLNIP PDUs or non-encapsulation of the
IMPD
...