ETSI I-ETS 300 465 ed.1 (1996-02)

Broadband Integrated Services Digital Network (B-ISDN); Availability and retainability performance for B-ISDN semi-permanent connections

DI/NA-042129

Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) – Razpoložljivost in obseg obdržljivosti za polstalne zveze v B-ISDN

General Information

• Status: Published
• Publication Date: 07-Mar-1996
• Technical Committee: NA 4 - Network Architecture, Operations, Maintenance, Principle & Performance
• Current Stage: 12 - Completion
• Due Date: 15-Mar-1996
• Completion Date: 08-Mar-1996
• Ref Project: SIST I-ETS 300 465 E1:2003 - Broadband Integrated Services Digital Network (B-ISDN); Availability and retainability performance for B-ISDN semi-permanent connections

Standards Content (Sample)

SLOVENSKI STANDARD
SIST I-ETS 300 465 E1:2003
01-december-2003
Širokopasovno digitalno omrežje z integriranimi storitvami (B-ISDN) –
Razpoložljivost in obseg obdržljivosti za polstalne zveze v B-ISDN
Broadband Integrated Services Digital Network (B-ISDN); Availability and retainability
performance for B-ISDN semi-permanent connections
Ta slovenski standard je istoveten z: I-ETS 300 465 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST I-ETS 300 465 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST I-ETS 300 465 E1:2003
INTERIM
EUROPEAN I-ETS 300 465
TELECOMMUNICATION February 1996
STANDARD
Source: ETSI TC-NA Reference: DI/NA-042129
ICS: 33.020, 33.080
B-ISDN, availability, performance
Key words:
Broadband Integrated Services Digital Network (B-ISDN);
Availability and retainability performance
for B-ISDN semi-permanent connections
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 1996. All rights reserved.

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I-ETS 300 465: February 1996
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
Introduction.5
1 Scope .7
2 Normative references.7
3 Symbols and abbreviations .7
4 Definition of parameters .7
4.1 Definition of entry/exit criterion for the unavailable state .8
4.1.1 Definition of SES .8
ATM
4.1.2 Definition of the unavailable state .8
4.2 Specified parameters.8
4.2.1 Asymptotic unavailability .8
4.2.2 Outage intensity.9
5 Performance objectives.9
Annex A (informative): Example of observation method for SES .10
ATM
Annex B (informative): Related B-ISDN semi-permanent connection dependability parameters.11
Annex C (informative): Guidance for compliance testing for availability and retainability performance.12
Annex D (informative): Bibliography.13
History.14

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I-ETS 300 465: February 1996
Foreword
This Interim European Telecommunication Standard (I-ETS) has been produced by the Network Aspects
(NA) Technical Committee of the European Telecommunications Standards Institute (ETSI).
An ETSI standard may be given I-ETS status either because it is regarded as a provisional solution ahead
of a more advanced standard, or because it is immature and requires a "trial period". The life of an I-ETS
is limited to three years after which it can be converted into an ETS, have it's life extended for a further
two years, be replaced by a new version, or be withdrawn.
Proposed announcement date
Date of adoption of this I-ETS: 16 February 1996
Date of latest announcement of this I-ETS (doa): 31 May 1996
Introduction
From an availability and retainability point of view, a portion of a Broadband Integrated Services Digital
Network (B-ISDN) semi-permanent connection should have the following properties:
- unavailability
The unavailability of a B-ISDN semi-permanent connection portion is the fraction of time during
which it cannot accommodate a transaction (i.e. it is in a down state). This down state is to be
characterized by a set of decision parameters, specific to the information transfer phase, and their
associated outage criteria.
The fraction of time during which it is in a down state should be as low as possible;
- retainability
The retainability performance of B-ISDN semi-permanent connection portions is defined in this
I-ETS as the probability that a transaction using a B-ISDN semi-permanent connection portion once
obtained (i.e. is available), will neither be interrupted nor prematurely released (i.e. does not
become unavailable) for a given duration. In this I-ETS the retainability performance is specified in
terms of outage intensity.
Once a transaction is started on a B-ISDN semi-permanent connection, it should have a low
probability of being either interrupted (because of insufficient data transfer performance) or
prematurely released (due to the failure of some network component) before the requested end of
the transaction.

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1 Scope
This Interim European Telecommunication Standard (I-ETS) specifies availability and retainability
parameters for Broadband Integrated Services Digital Network (B-ISDN) semi-permanent connections
(VPCs and VCCs)
An international B-ISDN semi-permanent connection is partitioned into two national portions and an
international portion. The international portion is further partitioned into connection portions delimited by
International Measurement Points (MPIs) as defined in prI-ETS 300 464 [1].
A futur version of this I-ETS will specify objectives for the availability and retainability performance of each
of these portions, and measurement methods will be defined.
2 Normative references
This I-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 I-ETS only when incorporated in it by amendment or revision. For undated references the
latest edition of the publication referred to applies.
[1] I-ETS 300 464: "Asynchronous Transfer Mode (ATM); Broadband Integrated
Services Digital Network (B-ISDN); ATM layer cell transfer performance for
B-ISDN connection types".
[2] ITU-T Recommendation I.610 (1994): "B-ISDN operation and maintenance
principles and functions".
[3] ITU-T Recommendation E.800 (1994):."Terms and definitions related to quality
of service and network performance including dependability".
3 Symbols and abbreviations
For the purposes of this I-ETS, the following abbreviations apply:
AIS Alarm Indication Signal
ATM Asynchronous Transfer Mode
FS Frontier Station
ISC International Switching Center
MPI International Measurement Point
MTBO Mean Time Between Outages
MTTR Mean Time To Restore
OAM Operation Administration and Maintenance
SECB Severely Errored Cell Block
SES Severely Errored Second
ATM
4 Definition of parameters
The decision parameters which characterize the down state of a B-ISDN semi-permanent connection
portion are based on a subset of the performance parameters defined in prI-ETS 300 464 [1].
NOTE: It is likely that CLR and SECBR will be the parameters that form this subset.
The observation process of these decision parameters will include the specification of time during which
they are estimated. It is necessary to base the outage criteria for the unavailable state on successive
observations of decision parameters.
In order to classify available and unavailable states, entry/exit criteria are defined.

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