ETSI ETS 300 298-2 ed.1 (1995-03)

Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM); Part 2: B-ISDN ATM layer specification

DE/NA-052613-2

Digitalno omrežje z integriranimi storitvami (ISDN) – Asinhroni prenosni način (ATM) – Osnovne značilnosti in funkcijske specifikacije sistema ATM – 2. del: Specifikacija plasti v 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 300 298-2 E1:2003 - Broadband Integrated Services Digital Network (B-ISDN); Asynchronous Transfer Mode (ATM); Part 2: B-ISDN ATM layer specification

Standards Content (Sample)

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

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SIST ETS 300 298-2 E1:2003
EUROPEAN ETS 300 298-2
TELECOMMUNICATION March 1995
STANDARD
Source: ETSI TC-NA Reference: DE/NA-052613-2
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 2: B-ISDN ATM layer 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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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 Cell structure coding.8
4.1 Cell structure.8
4.2 Cell header format and coding at UNI .9
4.2.1 Pre-assigned values of the cell header reserved for use by the physical
layer.10
4.2.2 Generic Flow Control (GFC) field.10
4.2.3 Routeing field Virtual Path Identifier / Virtual Channel Identifier (VPI/VCI) .10
4.2.4 PT field .12
4.2.5 CLP field.12
4.2.6 HEC field .13
4.3 Cell header format and encoding at NNI .13
4.3.1 Pre-assigned values of the cell header .14
4.3.2 Routeing field (VPI/VCI) .14
4.3.3 PT field .15
4.3.4 CLP field.15
4.3.5 HEC field .15
4.4 Cell information field, pre-assigned values .15
5 Service primitives .16
6 ATM protocol procedures.16
6.1 GFC protocol.16
6.2 Layer management communication.16
6.3 Layer management.16
6.3.1 Meta-signalling .16
6.3.2 Fault management, functions.16
6.3.3 Performance management, functions .16
6.3.4 Configuration management, functions .16
6.3.5 Resource management, functions .16
Annex A (normative): Protocol Implementation Conformance Statement (PICS) proforma.17
A.1 Introduction.17
A.2 PICS .18
History.19

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ETS 300 298-2: 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 standardization 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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ETS 300 298-2: March 1995
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, from CCITT Recommendation I.361 [1]:
a) the cell structure and the ATM cell coding;
b) the ATM protocol procedures.
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.361: "B-ISDN ATM layer specification".
[2] CCITT Recommendation I.432: "B-ISDN user-network interface - Physical layer
specification".
[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] ETS 300 298-1: "Network Aspects (NA); Basic characteristics and functional
specification of Asynchronous Transfer Mode (ATM) Part 1: B-ISDN ATM
functional specification".
3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ATM Asynchronous Transfer Mode
CLP Cell Loss Priority
GFC Generic Flow Control
HEC Header Error Control
MSB Most Significant Bit
NNI Network Node Interface
OAM Operation And Maintenance
PT Payload Type
PTI Payload Type Identifier
UNI User-Network Interface
VCI Virtual Channel Identifier
VPI Virtual Path Identifier

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4 Cell structure coding
Two different coding schemes have been adopted; the User-Network Interface (UNI) format, and the
Network Node Interface (NNI) format. They are described in subclauses 4.2 and 4.3.
4.1 Cell structure
The cell consists of a 5 octet header and a 48 octet information field as shown in figure 1.
When a field within the header is contained within a single octet, the lowest bit number of the field
represents the lowest order value.
When a field spans more than one octet, the order of bit values within each octet progressively decreases
as the octet number increases. The lowest bit number associated with the field represents the lowest
order value.
This leads to the following conventions:
- bits within an octet are sent in decreasing order, starting with bit 8;
- octets are sent in increasing order, starting with octet 1;
- for all fields, the first bit sent is the Most Significant Bit (MSB).
Bits 8 7 6 5 4 3 2 1
1
HE A D E R
(5 octets)
5
6
53 octet cell
INF O R M AT ION FIE LD
(48 octets)
53
NOTE: The header will be sent first, followed by the information field.
Figure 1: Cell structure at the UNI/NNI

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4.2 Cell header format and coding at UNI
The structure of the header is shown in figure 2. The fields contained in the header and their encoding are
described in subclauses 4.2.1 to 4.2.6.
Bit
8 7 6 5 4 3 2 1
Octet
1
VPI
GFC
2
VCI
VPI
VCI 3
VCI
PT 4
CLP
5
HEC
VCI: Virtual Channel Identifier. PT: Payload Type.
VPI: Virtual Path Identifier. CLP: Cell Loss Priority.
GFC: Generic Flow Control. HEC: Header Error Control.
Figure 2: Header structure at UNI

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4.2.1 Pre-assigned values of the cell header reserved for use by the physical layer
Pre-assigned values of the cell header (to differentiate cells for the use of the ATM layer from cells for the
use of the physical layer) are given in table 1. All other values are for the use of the ATM layer.
Table 1: Pre-assigned cell header values at the UNI for the use by the physical layer
(excluding the Header Error Control (HEC) field)
Octet 1 Octet 2 Octet 3 Octet 4
Idle cell identification
00000000 00000000 00000000 00000001
(notes 1 and 2)
Physical layer OAM F1 cell
00000000 00000000 00000000 00000011
identification (note 2)
Physical layer OAM F3 cell
00000000 00000000 00000000 00001001
identification (note 2)
Reserved for use of the physical layer
PPPP0000 00000000 00000000 0000PPP1
(notes 1, 2 and 3)
P: Indicates the bit is available for use by the physical layer. Values assigned to these bits
have no meaning with respect to the fields occupying the corresponding bit positions at the
ATM layer.
NOTE 1: In the case of physical layer cells, the bit in the location of the Cell Loss Priority (CLP)
indication is not used for the CLP mechanism as specified in subclause 5.4.2.3.2 of
ETS 300 298-1 [6].
NOTE 2: Cells having header values which are identified as idle, physical layer Operation And
Maintenance (OAM), and reserved for use of the physical layer are not passed to the ATM
layer from the physical layer.
NOTE 3: Specific pre-assigned physical layer cell header values are given in CCITT
Recommendation I.432 [2].
4.2.2 Generic Flow Control (GFC) field
The GFC field contains 4 bits. When the GFC function is not used, the value of this field is 0000. When
the GFC mechanism is standardized, all values of this field are available for coding. This coding is for
further study. The coding shall take into account the relationship with the procedures described in
subclause 6.1.
4.2.3 Routeing field Virtual Path Identifier / Virtual Channel Identifier (VPI/VCI)
24 bits are available for routeing: 8 bits for VPI and 16 bits for VCI. Pre-assigned combinations of VPI and
VCI values are shown in table 2. Other pre-assigned values of VPI and VCI are for further study. The VCI
value of zero is not available for user virtual channel identification.

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Table 2: Combinations of pre-assigned VPI and VCI, PT, and CLP values at the UNI
VPI VCI PT CLP
0A0 C
Meta-signalling XXXX XXXX 00000000 00000001
(refer to CCITT Recommendation (note 1) (note 5)
I.311 [3])
0AA C
General broadcast signalling XXXX XXXX 00000000 00000010
(refer to CCITT Recommendation (note 1) (note 5)
I.311 [3])
0A0 A
Segment OAM F4 flow cell YYYY YYYY 00000000 00000011
(refer to CCITT Recommendation (note 2) (note 4)
I.610 [4])
0A0 A
End-to-end OAM F4 flow cell; YYYY YYYY 00000000 00000100
(refer to CCITT Recommendation (note 2) (note 4)
I.610 [4])
Point-to-point signalling XXXX XXXX 00000000 00000101 0AA C
(refer to CCITT Recommendation (note 1) (note 5)
I.311 [3])
Segment OAM F5 flow cell YYYY YYYY ZZZZZZZZ ZZZZZZZZ 100 A
(refer to CCITT Re
...