ETSI ETS 300 404 ed.2 (1997-04)

Broadband Integrated Services Digital Network (B-ISDN); B-ISDN Operation And Maintenance (OAM) principles and functions

RE/NA-052213

Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) – Načela in funkcije za obratovanje in vzdrževanje (OAM) sistema B-ISDN

General Information

• Status: Published
• Publication Date: 06-Apr-1997
• Technical Committee: NA 5 - Broadband Networks
• Current Stage: 12 - Completion
• Due Date: 14-Mar-1997
• Completion Date: 07-Apr-1997
• Ref Project: SIST ETS 300 404 E2:2003 - Broadband Integrated Services Digital Network (B-ISDN); B-ISDN Operation And Maintenance (OAM) principles and functions

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 404 E2:2003
01-december-2003
âLURNRSDVRYQRGLJLWDOQRRPUHåMH]LQWHJULUDQLPLVWRULWYDPL%,6'1±1DþHODLQ
IXQNFLMH]DREUDWRYDQMHLQY]GUåHYDQMH2$0VLVWHPD%,6'1
Broadband Integrated Services Digital Network (B-ISDN); B-ISDN Operation And
Maintenance (OAM) principles and functions
Ta slovenski standard je istoveten z: ETS 300 404 Edition 2
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 404 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 404 E2:2003

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SIST ETS 300 404 E2:2003
EUROPEAN ETS 300 404
TELECOMMUNICATION April 1997
STANDARD Second Edition
Source: ETSI TC-NA Reference: RE/NA-052213
ICS: 33.020
Key words: B-ISDN, OAM
Broadband Integrated Services Digital Network (B-ISDN);
B-ISDN Operation And Maintenance (OAM)
principles and functions
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
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 1997. All rights reserved.

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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 B-ISDN operation and maintenance principles and functions.8
5 Requirements for the application of ITU-T Recommendation I.610 as an European
Telecommunication Standard .8
Annex I (informative): Insertion process applicable to end-to-end or segment Forward Monitoring
(FM) cells.13
I.1 Processes applicable to Forward Monitoring (FM) cells .13
I.1.1 Forced insertion .13
I.1.2 Non-forced insertion .14
I.2 Process applicable to Backward Reporting (BR) cells .14
I.2.1 Forced insertion .14
I.2.2 Non-forced insertion .15
Annex II (informative): A guide to performing Loopbacks.16
History.19

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Foreword
This second edition European Telecommunication Standard (ETS) has been produced by the Network
Aspects (NA) Technical Committee of the European Telecommunications Standards Institute (ETSI).
This second edition of ETS 300 404, upgrades the standard from interim (I-ETS) status to full ETS status
and takes into account the latest edition of ITU-T Recommendation I.610 (1995).
This ETS describes the Operation And Maintenance (OAM) principles and functions for the Asynchronous
Transfer Mode (ATM) based Broadband Integrated Services Digital Network (B-ISDN).
Transposition dates
Date of adoption: 21 February 1997
Date of latest announcement of this ETS (doa): 31 July 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 January 1998
Date of withdrawal of any conflicting National Standard (dow): 31 January 1998

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1 Scope
This European Telecommunication Standard (ETS) identifies the minimum set of functions required to
operate and maintain the Physical Layer and the Asynchronous Transfer Mode (ATM) layer aspects of the
Broadband Integrated Services Digital Network (B-ISDN) User-Network Interface (UNI) as well as the
individual Virtual Path (VP) and the Virtual Channel (VC) connections that may be routed through the
B-ISDN.
The functions of the layers above the ATM layer are not considered.
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] ITU-T Recommendation I.610 (1995): "B-ISDN operation and maintenance
principles and functions".
[2] ITU-T Recommendation I.356: "B-ISDN ATM layer cell transfer performance".
[3] ITU-T Recommendation G.783: "Characteristics of synchronous digital hierarchy
(SDH) equipment functional blocks".
[4] ITU-T Recommendation I.361: "B-ISDN ATM layer specification".
3 Abbreviations
For the purpose of this ETS, the following abbreviations apply:
ATM Asynchronous Transfer Mode
B-ISDN Broadband Integrated Services Digital Network
BR Backward Reporting
CC Continuity Check
CP Connection Point
NOTE: The use of the expression "Connecting Point" in Recommendation I.610 is ambiguous
in the sense that, depending on the context, it may stand for either an actual
"Connecting Point" as defined in Recommendation I.311 or for a "Connection Point" as
defined in ITU-T Recommendation I.326. This ETS uses only the concept of
"Connection Point", abbreviated as "CP" since it is more appropriate to describe OAM
functions that apply at the VP/VC levels for a specific VP/VC connection.
CPID Connection Point Identifier
FM Forward Monitoring
LB Loopback
LI Loopback indication
LLID Loopback Location Identifier
NNI Network Node Interface
NPC Network Parameter Control
OAM Operation And Maintenance
PDH Plesiochronous Digital Hierarchy
PM Performance Management
PTI Payload Type Identifier
SDH Synchronous Digital Hierarchy
Seg. Segment (of VPC/VCC)
T T Reference Point in B-ISDN
B
UNI User Network Interface
UPC Usage Parameter Control
VC Virtual Channel

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VCC Virtual Channel Connection
VCI Virtual Channel Identifier
VP Virtual Path
VPC Virtual Path Connection
VPI Virtual Path Identifier
VC AIS Alarm Indication for VC
VC RDI Remote Defect Indication for VC
VP AIS Alarm Indication for VP
VP RDI Remote Defect Indication for VP
4 B-ISDN operation and maintenance principles and functions
The B-ISDN operation and maintenance principles and functions are specified in ITU-T Recommendation
I.610 [1]. ITU-T Recommendation I.610 [1] has the following structure, which is given here for information:
Clause 1: Introduction
Clause 2: OAM principles
Clause 3: OAM levels and flows
Clause 4: Mechanisms to provide OAM flows
Clause 5: OAM functions of the Physical Layer
Clause 6: OAM functions of the ATM Layer
Clause 7: ATM Layer OAM cell format
Annex A: Virtual Channel/Virtual Path Status Monitoring
Annex B: SDLs for activation/deactivation using OAM cells
Annex C: Procedures to be performed when receiving Loopback OAM cells
Appendix A: Examples of OAM Cell Error Detection Codes
5 Requirements for the application of ITU-T Recommendation I.610 as an
European Telecommunication Standard
This ETS endorses ITU-T Recommendation I.610 [1], with the following changes/additions/clarifications.
The following statements give the interpretation of open issues in this Recommendation, to apply in this
ETS.
subclause 1.2 Scope
The functions of the layers above the ATM layer are not considered. Results of the further study of these
layers in ITU-T may not be included in this ETS at a later stage.
subclause 4.2.1 F4 flow mechanism
Intermediate points along the VPC or along the VPC segment may monitor OAM cells passing through
them and insert new OAM cells, but they can not terminate the OAM flow except when segment
loopbacks are performed.
NOTE: In ITU-T Recommendation I.361 [4] a modification of the PTI field is allowed. If this is
done without control of the type of cell, this can lead to a loss of OAM F5 cells.
Table 3/I.610
The reference to ITU-T Recommendation G.783 [3] in note 4 shall not be considered.
Add the following note in the last row (about Cell Delineation function), last column (about Path RDI):
NOTE 6: In future release of I.432 the appropriate information could be transmitted in the
payload dependent byte.

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Table 5/I.610 and subclause 6.2.1.1.1.1
System protection and failure information for VP/VC failures at the ATM level will be proposed for a later
version of this ETS as soon as they are agreed for inclusion in ITU-T Recommendation I.610 [1].
subclause 6.2.1.1.2 VPC continuity check
Permanent end-to-end CC mechanisms (source and sink processes) shall be provided simultaneously for
all reserved, permanent and semi-permanent VPCs. It is recognized that this requirement may not be
fulfilled by some existing ATM equipments that have been already deployed at the time this ETS was
published. Nevertheless it is intended that ATM equipment OAM capabilities shall evolve to satisfy this
requirement.
This requirement applies to the VPCs which are terminated, at both ends, within the domain controlled by
one network operator (e.g. all VPCs which link VC Switches within the network operator domain or VPCs
which link ATM MUXs under the control of one network operator) and to the VPC Segments
corresponding to such VPCs.
The handling of CC of VPCs terminated in domains controlled by different network operators is subject to
bilateral agreement between those network operators.
Activation/deactivation of the CC mechanisms shall be performed by using the Telecommunications
Management Network (TMN) procedure at the setting-up/release of the VPC or the VPC Segment.
However, depending on the operational requirement of a network operator, the CC mechanism may be
activated/deactivated at any time by using the TMN procedure.
Whether the end-to-end or Segment CC mechanisms can be activated or not for reserved, permanent
and semi-permanent VPCs terminated, at both ends, within the domain controlled by Customers, depends
on the Customer Equipment capability and is under Customer responsibility.
Only option 1) is retained, that is a CC cell is sent downstream by a VPC source-point or a VPC Segment
source-point when no user cell has been sent for a period of nominally 1 second.
subclause 6.2.1.1.3.2 Principles of operation
Replace the second sentence under item 1 by the following text.
There is no need to remove a Seg_LB cell at the intermediate CP along the VPC, that originated the
Seg_LB cell since the Seg_LB will be removed at the Segment end point. This applies also to annex C of
ITU-T Recommendation I.610 [1].
Replace the third sentence under item 2 by the following text.
The possibility to analyse the content of the LLID field of Seg_LB cell shall be provided so as to identify the
CPs where the loopback action has to be performed. It shall be possible to use the default all "1s" value
for the LLID field. In this case Seg_LB cells shall be copied and forwarded in the opposite direction from
any CP within the Segment for which the LLID option is enabled by the TMN.
NOTE: See also annex II/ETS 300 404.
subclause 6.2.1.2 VP performance management functions
Forced insertion of performance monitoring cells is permitted at segment level for the VP and VC level.
NOTE: Concerning the forced and non-forced insertion of Forward monitoring cells see also
annex I/ETS 300 404.

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subclause 6.2.1.4 Non intrusive monitoring function
This subclause is an addition to the existing ITU-T Recommendation I.610 [1] text.
Non intrusive monitoring of any type of end-to-end Fault and Performance Management OAM flows may
be performed at any intermediate CP along a VPC, this includes intermediate CPs within a VPC Segment
(see note). If implemented, this monitoring capability shall be provided simultaneously for a certain
number of selected VPCs per interface (UNI, NNI). The specification of this number is beyond the scope
of this ETS.
NOTE: The purpose of the non intrusive monitoring function is to provide to network operators,
additional OAM information which cannot be derived from the content of Segment
OAM flows. As an example monitoring both the VP-RDI and the corresponding VP-BR
flow gives the possibility to assess, from any CP, both the status
(available/unavailable) and the end-to-end performance of a VPC. As another
example, monitoring the VP-FM in conjunction with the VP-Segment FM flows
established for all network operator's domains can help to localize performance
impairments in case those impairments are located within the customer network.
subclause 6.2.2.1.2 VCC continuity check
The possibility to activate the end-to-end CC mechanisms shall be provided simultaneously for a certain
number of reserved, permanent and semi-permanent VCCs (see note). This requirement applies to VCCs
which are terminated, at both ends, within the domain controlled by network operators.
Activation/deactivation of the CC mechanisms at the setting-up/release of reserved, permanent or semi-
permanent VCC remains as an option.
NOTE: The end-to-end CC mechanism is intended to be used for VCCs providing a service
which needs an AIS information for "upper layers" in case of defect occurring in the
lower layers.
In the general case, whenever PM is performed end-to-end on VCCs terminated, at both ends, within the
domain controlled by network operators, the end-to-end CC mechanisms (source and sink processes)
shall be activated (see note 1). However it should be possible to activate PM only which might be
interesting if the ATM nodes located at one or both ends are not able to provide the CC mechanisms. The
activation of the end-to-end CC mechanisms shall be performed either before the activation of the PM
process or at the same time by using one of the activation procedures described in subclause 6.2.3 of
ITU-T Recommendation I.610 [1] (see note 2).
In the general case, whenever PM is performed on VCC Segments terminated, at both ends, within the
domain controlled by network operato
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