ETSI ETS 300 251 ed.1 (1993-08)

Network Aspects (NA); Accessibility for 64 kbit/s circuit switched international end-to-end ISDN traffic relations

DE/NA-042106

Omrežni vidiki (NA) – Dostopnost mednarodnih vodovno komutiranih prometnih povezav konec-konec za hitrosti 64 kbit/s v ISDN

General Information

• Status: Published
• Publication Date: 26-Aug-1993
• Technical Committee: NA 4 - Network Architecture, Operations, Maintenance, Principle & Performance
• Current Stage: 12 - Completion
• Due Date: 27-Aug-1993
• Completion Date: 27-Aug-1993
• Ref Project: SIST ETS 300 251 E1:2003 - Network Aspects (NA); Accessibility for 64 kbit/s circuit switched international end-to-end ISDN traffic relations

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 251 E1:2003
01-december-2003
Omrežni vidiki (NA) – Dostopnost mednarodnih vodovno komutiranih prometnih
povezav konec-konec za hitrosti 64 kbit/s v ISDN
Network Aspects (NA); Accessibility for 64 kbit/s circuit switched international end-to-end
ISDN traffic relations
Ta slovenski standard je istoveten z: ETS 300 251 Edition 1
ICS:
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 251 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 251 E1:2003
EUROPEAN ETS 300 251
TELECOMMUNICATION August 1993
STANDARD
Source: ETSI TC-NA Reference: DE/NA-042106
ICS: 33.080
ISDN, access
Key words:
Network Aspects (NA);
Accessibility for 64 kbit/s circuit switched
international end-to-end ISDN traffic relations
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 1993. All rights reserved.
New presentation - see History box

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ETS 300 251: August 1993
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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ETS 300 251: August 1993
Contents
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions. 7
4 Symbols and abbreviations.8
5 Explicit definition for a measure for accessibility performance .8
5.1 Introduction.8
5.2 Principles and definitions.8
6 Requirements.9
7 Success criteria for connection attempts. 10
8 Evaluation of the NP measure for accessibility . 11
History. 13

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ETS 300 251: August 1993
Foreword
This European Telecommunication Standard (ETS) has been prepared by the Network Aspects (NA)
Technical Committee of the European Telecommunications Standards Institute (ETSI).
This ETS specifies the accessibility of international end-to-end circuit-switched 64 kbit/s Integrated
Services Digital Network (ISDN) traffic relations between T reference points.

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ETS 300 251: August 1993
1 Scope
This European Telecommunication Standard (ETS) specifies the accessibility of international end-to-end
circuit-switched 64 kbit/s Integrated Services Digital Network (ISDN) traffic relations between T reference
points.
This ETS does not cover blocking at the user-network interface nor catastrophic situations, e.g. earth
quakes, floods, etc.
NOTE: A corresponding compliance ETS is planned for September 1994. Until the document is
available, this ETS may be used for design purposes.
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] Supplement No. 6 to CCITT E series Recommendations: "Terms and definitions
of Quality of Service, Network Performance, Dependability and Trafficability
studies".
[2] ETR 044: "Network Aspects (NA); Reference events for network performance
parameters in an ISDN".
[3] DE/NA-042104: "Network performance objectives for circuit-switched connection
processing delays in an ISDN".
[4] ETS 300 297: "Integrated Services Digital Network (ISDN); Access Digital
Section for ISDN basic rate".
[5] DI/NA-042117: "Network Aspects (NA); Accessibility for 64 kbit/s
circuit-switched international end-to-end ISDN traffic relations Conformance test
specification".
3 Definitions
For the purpose of this ETS, the following definitions apply:
Accessibility performance: the ability of a network to provide a connection within a specified delay when
a correct request is received from the user at the T interface.
NOTE: The request includes activation of layer 1.
Accessibility: a measure for accessibility performance. The explicit definition of the measure is given in
Clause 5 of this ETS.
Measure: a function or quantity used to describe a random variable or a random process (definition
number 3011 in Supplement No. 6 to CCITT E series Recommendations [1]).
Short Term Accessibility (STA): the explicit definition of the STA is given in Clause 5 of this ETS.

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4 Symbols and abbreviations
For the purpose of this ETS, the following symbols and abbreviations are used:
MPT1 Measurement Point 1
NP Network Performance
STA Short Term Accessibility
T Time interval over which the random variable STA is defined
a
T interface at reference point T
SABME Set Asynchronous Balanced Mode Extended
UA Unnumbered Acknowledgement
5 Explicit definition for a measure for accessibility performance
5.1 Introduction
A Network Performance (NP) measure for accessibility performance should be as simple and easy to
evaluate as possible. On the other hand, as the quality of service measure for accessibility performance
depends mainly on the corresponding NP measure of the used network, a NP measure for accessibility
performance has to characterise, as accurately as possible, the aspects which are important for the user.
These requirements are conflicting and there
...