ETSI ETS 300 298-1 ed.1 (1995-03)

Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM); Part 1: B-ISDN ATM functional specification

DE/NA-052613-1

Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) – Asinhroni prenosni način (ATM) – Osnovne značilnosti in funkcijske specifikacije sistema ATM – 1. del: Funkcijska specifikacija za B-ISDN ATM

General Information

• Status: Published
• Publication Date: 02-Mar-1995
• Technical Committee: NA 5 - Broadband Networks
• Current Stage: 12 - Completion
• Due Date: 14-Mar-1995
• Completion Date: 03-Mar-1995
• Ref Project: SIST ETS 300 298-1 E1:2003 - Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM); Part 1: B-ISDN ATM functional specification

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 298-1 E1:2003
01-december-2003
âLURNRSDVRYQRGLJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL%,6'1±$VLQKURQL
SUHQRVQLQDþLQ$70±2VQRYQH]QDþLOQRVWLLQIXQNFLMVNHVSHFLILNDFLMHVLVWHPD
$70±GHO)XQNFLMVNDVSHFLILNDFLMD]D%,6'1$70
Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode
(ATM); Part 1: B-ISDN ATM functional specification
Ta slovenski standard je istoveten z: ETS 300 298-1 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 298-1 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 298-1 E1:2003

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SIST ETS 300 298-1 E1:2003
EUROPEAN ETS 300 298-1
TELECOMMUNICATION March 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-052613-1
ICS: 33.080
Broadband, ISDN, ATM
Key words:
Broadband Integrated Services Digital Network (ISDN);
Asynchronous Transfer Mode (ATM);
Basic characteristics and functional specification of ATM;
Part 1: B-ISDN ATM functional specification
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
Tel.: [phone] - Fax: [phone]
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
New presentation - see History box

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ETS 300 298-1: March 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 Committee Support Dept." at the address shown on the title page.

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Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Abbreviations.7
4 Basic principles of ATM.8
5 ATM layer .8
5.1 ATM layer connections .8
5.1.1 Connection definition.8
5.1.2 Connection identifiers.9
5.1.2.1 Virtual Path Identifiers (VPIs) and Virtual Channel
Identifiers (VCIs).9
5.1.2.2 VPI - VCI relationships.9
5.1.2.3 Number of active connections at the UNI.9
5.1.2.4 Number of active connections at the NNI.9
5.1.3 Aspects of VCCs .10
5.1.3.1 General characteristics of VCCs .10
5.1.3.2 Establishment and release of a VCC.10
5.1.3.2.1 Establishment/release at the UNI .10
5.1.3.2.2 Establishment/release at the NNI .11
5.1.3.3 Pre-assigned VCIs.11
5.1.3.4 Signalling VCs .11
5.1.3.5 OAM VCs.11
5.1.4 Aspects of VPCs .11
5.1.4.1 General characteristics of VPCs.11
5.1.4.2 Establishment and release of a VPC.12
5.1.4.3 Pre-assigned VPIs.12
5.1.5 Pre-assigned cell header values .12
5.2 Service characteristics.12
5.3 Management plane interactions.12
5.4 Functions of the ATM layer.13
5.4.1 Cell multiplexing and switching .13
5.4.2 QoS provided by the ATM layer .13
5.4.2.1 QoS related to VCCs .13
5.4.2.2 QoS related to VPCs .13
5.4.2.3 QoS related to Cell Loss Priority (CLP) .13
5.4.2.3.1 General.13
5.4.2.3.2 CLP Indicator.14
5.4.3 PT functions .14
5.4.4 Generic Flow Control (GFC) at the UNI .14
History.16

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ETS 300 298-1: March 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
Asynchronous Transfer Mode (ATM) is the transfer mode solution for implementing a Broadband
Integrated Services Digital Network (B-ISDN). It influences the standardisation of digital hierarchies,
multiplexing structures, switching and interfaces for broadband signals.
This ETS consists of 2 parts as follows:
Part 1: "B-ISDN ATM functional specification".
Part 2: "B-ISDN ATM layer specification".
Transposition dates
Date of latest announcement of this ETS (doa): 30 June 1995
Date of latest publication of new National Standard 31 December 1995
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 31 December 1995

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1 Scope
This European Telecommunication Standard (ETS) is a 2 Part ETS which gives the basic characteristics
and functional specification of Asynchronous Transfer Mode (ATM).
This part specifically addresses the functions of the ATM layer (see CCITT Recommendation I.150 [1]).
This layer is common to all services, including signalling and Operation And Maintenance (OAM).
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this ETS only when incorporated in it by amendment or revision. For undated references the latest
edition of the publication referred to applies.
[1] CCITT Recommendation I.150: "B-ISDN asynchronous transfer mode functional
characteristics".
[2] CCITT Recommendation I.113: "Vocabulary of terms for broadband aspects of
ISDN".
[3] CCITT Recommendation I.311: "B-ISDN general network aspects".
[4] CCITT Recommendation I.610: "B-ISDN Operation and Maintenance principles
and functions".
[5] CCITT Recommendation I.371: "Traffic control & congestion control in B-ISDN".
[6] CCITT Recommendation I.413: "B-ISDN user-network interface".
[7] ETS 300 298-2: "Network Aspects (NA); Basic characteristics and functional
specification of Asynchronous Transfer Mode (ATM) Part 2: B-ISDN ATM layer
specification".
3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AAL ATM Adaptation Layer
B-NT2 Broadband Network Termination 2
B-TE Broadband Terminal Equipment
CBR Constant Bit Rate
CLP Cell Loss Priority
GFC Generic Flow Control
NNI Network Node Interface
OAM Operation And Maintenance
PT Payload Type
QoS Quality of Service
TE Terminal Equipment
UNI User-Network Interface
VBR Variable Bit Rate
VC Virtual Channel
VCC Virtual Channel Connection
VCI Virtual Channel Identifier
VP Virtual Path
VPC Virtual Path Connection
VPI Virtual Path Identifier

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4 Basic principles of ATM
ATM is used in this ETS for addressing a specific packet oriented transfer mode which uses
asynchronous time division multiplexing techniques. The multiplexed information flow is organized into
blocks of fixed size called cells. A cell consists of an information field and a header. The primary role of
the header is to identify cells belonging to the same Virtual Channel (VC) within the asynchronous time
division multiplex. Transfer capacity is assigned by negotiation and is based on the source requirements
and the available capacity. Cell sequence integrity on a Virtual Channel Connection (VCC) is preserved by
1)
the ATM layer .
ATM is a connection oriented technique. Connection identifiers are assigned to each link of a connection
when required and released when no longer needed. In general, signalling and user information are
carried on separate ATM connections.
ATM offers a flexible transfer capability common to all services, including connectionless services.
Additional functionalities above the ATM layer (e.g. in the ATM Adaptation Layer (AAL)) are provided to
accommodate various services. The boundary between the ATM layer and the AAL corresponds to the
boundary between functions supported by the contents of the cell header and functions supported by AAL
specific information. The AAL specific information is contained in the information field of the ATM cell.
The information field is transported transparently by the ATM layer. No processing, e.g. error control, is
performed on the information field at the ATM layer.
The header and information field each consist of a fixed integer number of octets. The header size,
(5 octets), and the information field size, (48 octets), remain constant at all reference points, including the
User-Network Interface (UNI) and the Network Node Interface (NNI), where the ATM technique is applied.
5 ATM layer
5.1 ATM layer connections
5.1.1 Connection definition
An ATM layer connection consists of the concatenation of ATM layer links in order to provide an
end-to-end transfer capability to access points.

1
) For a multipoint-to-point virtual connection, cell sequence integrity is preserved for cells from each VCC endpoint of the VCC.

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5.1.2 Connection identifiers
5.1.2.1 Virtual Path Identifiers (VPIs) and Virtual Channel Identifiers (VCIs)
At a given interface, in a given direction, the different Virtual Path (VP) links multiplexed at the ATM layer
into the same physical layer connection are distinguished by the VPI. The different VC links in a Virtual
Path Connection (VPC) are distinguished by the VCI as indicated in figure 1.
Physical layer con nection
_ _ _ _ _ _ _ _
VCI .
a
.
_ _ _ _ _ _ _ _
VPI
x
.
VCI
b
_ _ _ _ _ _ _ _
_ _ _ _ _ _ _ _
VPI
y
NOTE: VCI and VCI represent two of the possible values of VCI within the VP link with the
a b
value VPI . Similarly, VPI and VPI refer to two of the possible values of VPI within the
x x y
physical layer connection.
Figure 1: ATM layer connection identifier
5.1.2.2 VPI - VCI relationships
Two different VCs belonging to two different VPs at a given interface may have the same VCI value.
Therefore, a VC is only fully identified at an interface by both VPI and VCI values.
A specific value of VCI has no end-to-end significance if the VCC is switched. VPIs may be changed
wherever VP links are terminated (e.g. cross-connects, concentrators and switches). VCIs may only be
changed where VC links are terminated. As a consequence, VCI values are preserved within a VPC.
5.1.2.3 Number of active connections at the UNI
At the UNI, 24 bits are available in the VPI/VCI field for connection identification. The actual number of
routeing bits in the VPI and VCI fields used for routeing is negotiated between the user and the network,
e.g. on a subscription basis. This number is determined on the basis of the lower requirement of the user
or the network. The rules to determine the position of the routeing bits used within the VPI/VCI field are
given in subclause 4.2.3 of ETS 300 298-2 [7].
NOTE: The number of VCI field routeing bits used in a user-to-user VP is negotiated between
the users of the VP.
5.1.2.4 Number of active connections at the NNI
At the NNI, 28 bits are available in the VPI/VCI field for connection identification. The actual number of
routeing bits in the VPI and VCI fields used for routeing is established at installation. This number is
determined on the basis of the requirement of each entity. The rules to determine the position of the
routeing bits used within the VPI/VCI field are given in subclause 4.3.2 of ETS 300 298-2 [7].

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5.1.3 Aspects of VCCs
5.1.3.1 General characteristics of VCCs
The definition of a VCC is given in CCITT Recommendation I.113 [2]. This subclause provides additional
explanations to facilitate the understanding of the following topics:
a) Quality of Service (QoS): a user of a VCC is provided with a QoS specified by parameters such as
cell loss ratio and cell delay variation;
b) switched, semi-permanent and permanent VCCs: VCCs can be provided on a switched, semi-
permanent or permanent basis;
c) cell sequence integrity: cell sequence integrity is preserved within a VCC;
d) traffic parameter negotiation and usage monitoring: when a user requests from the network the
establishment of a VCC, traffic parameters shall be negotiated between a user and a network for
each VCC at VCC establishment and may be subsequently renegotiated. Input cells from the user
to the network may be monitored to ensure that the negotiated traffic parameters are not violated.
At a B-ISDN interface (e.g. UNI or NNI), there are two
...