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

DE/NA-052104

Omrežni vidiki (NA) – Velemestno omrežje (MAN) – Medsebojno povezovanje komutacijskih sistemov v omrežju MAN (MMS) prek vmesnika za asinhroni prenosni način (ATM)

General Information

• Status: Published
• Publication Date: 21-Feb-1995
• Technical Committee: NA 5 - Broadband Networks
• Current Stage: 12 - Completion
• Due Date: 01-Mar-1995
• Completion Date: 22-Feb-1995
• Ref Project: SIST ETS 300 405 E1:2003 - Network Aspects (NA); Metropolitan Area Network (MAN); Interconnection of MAN Switching Systems (MSS) based on an Asynchronous Transfer Mode (ATM) interface

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 405 E1:2003
01-december-2003
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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
SIST ETS 300 405 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 405 E1:2003

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SIST ETS 300 405 E1:2003
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

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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.

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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

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
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.

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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".

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[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].

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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.

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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
...