SIST ETS 300 247:1999

SLOVENSKI STANDARD
SIST ETS 300 247:1999
01-november-1999
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Business Telecommunications (BT); Open Network Provision (ONP) technical
requirements; 2 048 kbit/s digital unstructured leased line (D2048U) Connection
characteristics
Ta slovenski standard je istoveten z: ETSI ETS 300 247 ed.1 (1993-10)
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST ETS 300 247:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 247:1999

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SIST ETS 300 247:1999
EUROPEAN ETS 300 247
TELECOMMUNICATION October 1993
STANDARD
Source: ETSI TC-BT Reference: DE/BT-02019
ICS: 33.080
ONP, leased lines, D2048U
Key words:
Business Telecommunications (BT);
Open Network Provision (ONP) technical requirements;
2 048 kbit/s digital unstructured leased line (D2048U)
Connection characteristics
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 - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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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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 Standards Approval 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 Definitions. 7
4 Symbols and abbreviations.8
5 Requirements.9
5.1 Attributes.9
5.1.1 Information transfer rate . 10
5.1.2 Information transfer susceptance. 10
5.1.3 Structure . 10
5.1.4 Establishment of communication . 10
5.1.5 Symmetry. 11
5.1.6 Communication configuration. 11
5.1.7 Network performance. 11
5.1.7.1 Transmission delay . 11
5.1.7.2 Jitter. 12
5.1.7.2.1 Jitter tolerance at the network input
port. 12
5.1.7.2.2 Maximum jitter at the network output
port. 13
5.1.7.3 Slip. 13
5.1.7.4 Error. 13
5.1.7.4.1 Errored seconds . 13
5.1.7.4.2 Severely errored seconds. 13
5.1.7.4.3 Background block errors. 14
Annex A (normative): Test methods . 15
A.1 General . 15
A.1.1 Equipment connection. 15
A.1.2 Sequence of performing the tests. 15
A.2 Test methods. 15
A.2.1 Information transfer rate, susceptance, structure and symmetry . 15
A.2.2 Delay . 16
A.2.3 Jitter . 16
A.2.4 Error and slip. 18
Annex B (informative): Reduction of the measuring period for error . 19
B.1 Introduction. 19
B.2 Explanation . 19
Annex C (informative): Bibliography. 22
History. 23

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Business
Telecommunications (BT) Technical Committee of the European Telecommunications Standards Institute
(ETSI).
This ETS results from a mandate from the Commission of the European Community (CEC) to provide
harmonised standards for the support of the Directive on Open Network Provision (ONP) of leased lines
(92/44/EEC).
There are two other standards directly related to this ETS:
ETS 300 246: "Open Network Provision (ONP) technical requirements; 2 048 kbit/s digital
unstructured leased line (D2048U), Network interface presentation";
ETS 300 248: "Open Network Provision (ONP) technical requirements; 2 048 kbit/s digital
unstructured leased line (D2048U), Terminal equipment interface".
This ETS is based on information from CCITT Recommendations and ETSI publications and the relevant
documents are quoted where appropriate.
Introduction
The Council Directive on the application of Open Network Provision (ONP) to leased lines (92/44/EEC),
concerns the harmonisation of conditions for open and efficient access to, and use of, the leased lines
provided on public telecommunications networks and the availability throughout the Community (EEC) of a
minimum set of leased lines with harmonised technical characteristics.
The consequence of the Directive is that Telecommunications Organisations within the EEC shall make
available a set of leased lines between points in these countries with specified connection characteristics
and specified interfaces. Under the Second Phase Directive (91/263/EEC), terminal equipment for
connection to these leased lines will be required to fulfil certain essential requirements.
CCITT Recommendation I.340 for ISDN connection types is used as a basis for the connection
characteristics.

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1 Scope
This ETS specifies the technical requirements and test principles for connection characteristics of ONP
2 048 kbit/s digital unstructured leased lines.
A connection is presented via interfaces at Network Termination Points (NTP) and includes any equipment
that may provide the NTP. Signals between terminal equipments are subject to impairments during their
transfer over the connection. The limits to these impairments are stated in this ETS. Together with the
companion standard, ETS 300 246 [3] defining the interface presentation, this ETS describes the service
offered.
The leased line provides access to the full digital bit rate of 2 048 kbit/s with no restrictions on the binary
content.
The tests specified in this ETS cannot be carried out, nor can the performance be monitored by the leased
line provider, while the leased line is in service, i.e. carrying users' traffic. Thus the tests are designed for
bringing into and returning into service, although there is no obligation to perform these tests each time a
leased line is brought into or returned into service.
This ETS is applicable to leased lines, including part time leased lines, for which the establishment or
release do not require any protocol exchange or other intervention at the NTP.
This ETS specifies the compliance tests for the connection requirements. This ETS does not include details
concerning the implementation of the tests, nor does it include information on any relevant regulations.
This ETS describes those characteristics of the connection that cannot be determined only by the
equipment providing the NTPs. The related standard ETS 300 246 [3] defines the interface presentation
and places no further constraints on the connection.
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 O.151 (1988): "Error performance measuring
equipment for digital systems at the primary bit rate and above".
[2] CCITT Recommendation O.153 (1988): "Basic parameters for the measurement
of error performance at bit rates below the primary rate".
[3] ETS 300 246 (1993): "Open Network Provision (ONP) technical requirements;
2 048kbit/s digital unstructured leased line (D2048U), Network interface
presentation".
NOTE: This ETS also contains a number of informative references which have been included to
indicate the sources from which various material has been derived, hence they do not
have an associated normative reference number. Details of these publications are given
in Annex C. In some cases the same publication may have been referenced in both a
normative and an informative manner.
3 Definitions
For the purposes of this ETS, the following definitions apply:

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Leased lines: the telecommunications facilities provided by a public telecommunications network that
provide defined transmission characteristics between network termination points and that do not include
switching functions that the user can control, (e.g. on-demand switching).
Network Termination Point (NTP): all physical connections and their technical access specifications
which form part of the public telecommunications network and are necessary for access to, and efficient
communication through, that public network.
Unavailability period: a period of time beginning at the first of 10 consecutive severely errored seconds
and ending immediately before the first following period of 10 consecutive seconds none of which are
severely errored.
1)
Errored block : a block with one or more bit errors.
NOTE: The duration of a block is 1 millisecond.
1
Errored second : a one-second period with one or more errored blocks.
1)
Severely disturbed period : occurs when, over a minimum period of time equivalent to four contiguous
-2
blocks, either all the contiguous blocks are affected by a high binary error density of at least 10 , or a loss
of signal information is observed.
1)
Severely errored second : a one-second period which contains at least 30 % errored blocks or at least
one severely disturbed period.
Slip: a sequence of one or more extra or missing consecutive unit intervals in the bit stream.
1)
Errored seconds ratio : the ratio of errored seconds over all seconds within a specified measuring
period, where neither are counted during unavailability periods.
1)
Severely errored seconds ratio : the ratio of severely errored seconds over all seconds within a
specified measuring period, where neither are counted during unavailability periods.
1)
Background block error ratio : the ratio of errored blocks over all blocks within a specified measuring
period, where neither are counted during unavailability periods nor during severely errored seconds.
Satellite transmission: transmission via an earth orbiting satellite.
4 Symbols and abbreviations
For the purposes of this ETS, the following abbreviations apply:
D2048U 2 048 kbit/s digital unstructured ONP leased line
ONP Open Network Provision
NTP Network Termination Point
ppm parts per million
9
PRBS(2 -1) Pseudo Random Bit Sequence (as defined in § 2.1 of CCITT Recommendation
O.153 [2])
15
PRBS(2 -1) Pseudo Random Bit Sequence (as defined in § 2.1 of CCITT Recommendation
O.151 [1])
RX Receive (a signal input at either the leased line interface or the test equipment)

1
These definitions are based on CCITT Recommandation G.826.

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TX Transmit (a signal output at either the leased line interface or the test equipment)
UI Unit Interval
5 Requirements
The performance of the leased line shall comply with these requirements only if the conditions of supply of
the network equipment providing the NTP are met, (e.g. if the equipment is connected to an appropriate
power supply on the customer's premises).
The CCITT attribute technique is used to express the connection requirements. The following attributes
from CCITT Recommendation I.140 are specified in this ETS:
- Information transfer rate;
- Information transfer susceptance;
- Structure;
- Establishment of communication;
- Symmetry;
- Communication configuration;
- Network performance.
NOTE: "Bit rate" is equivalent to "information transfer rate" in this ETS.
The following network performance sub-attributes are considered relevant for this ETS:
- Transmission delay;
- Jitter;
- Slip;
- Error.
5.1 Attributes
The connection attributes are displayed in table 1. In effect, these attributes define the service being
offered.
The values and the associated compliance tests can be found in the subsequent subclauses.

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Table 1: Connection attributes
Connection type attributes Value
Description Nature Reference subclause
Information transfer rate 2 048 ± 50 ppm kbit/s See 5.1.1
Information transfer susceptance Unrestricted digital See 5.1.2
Structure Unstructured See 5.1.3
Establishment of communication Without user intervention See 5.1.4
Symmetry Symmetrical in both directions See 5.1.5
Communication configuration Point-to-point See 5.1.6
Network performance sub-attributes
Connection type attributes Value
Description Nature Reference subclause
Transmission delay Terrestrial and satellite options See 5.1.7.1
Jitter Input and output ports See 5.1.7.2
Slip 5 per 24 hour period See 5.1.7.3
Error parameters
Time interval with errored blocks Value
Description Nature Reference subclause
Errored seconds 2 889 per 24 hour period See 5.1.7.4.1
Severely errored seconds 117 per 24 hour period See 5.1.7.4.2
Background block errors 22 395 per 24 hour period See 5.1.7.4.3
5.1.1 Information transfer rate
Requirement: The connection shall be capable of transferring an information rate of
2 048 kbit/s ± 50 ppm.
Test: The test shall be conducted according to Annex A, subclause A.2.1.
5.1.2 Information transfer susceptance
Requirement: The connection shall be capable of transferring unrestricted digital information.
Test: The test shall be conducted according to Annex A, subclause A.2.1.
5.1.3 Structure
Requirement: The connection shall be unstructured. The full bit rate of 2 048 kbit/s shall be available to
the user for unrestricted digital information transfer.
Test: The test shall be conducted according to Annex A, subclause A.2.1.
5.1.4 Establishment of communication
Requirement: Establishment or release of the connection shall not require any protocol exchange or other
intervention at the NTP by the user.
Test: By declaration.

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5.1.5 Symmetry
Requirement: The connection shall be symmetrical, i.e. each direction of transmission shall have the same
nominal characteristics, although the actual values shall be independent.
Test: The test shall be conducted according to Annex A, subclause A.2.1.
5.1.6 Communication configuration
Requirement: The connection configuration shall be point-to-point.
Test: By declaration.
5.1.7 Network performance
The network performance sub-attributes are displayed in table 1. The values and the associated
compliance tests can be found in the subsequent subclauses.
5.1.7.1 Transmission delay
Requirement: The requirement depends upon whether satellite transmission is involved in the connection
or not:
a) for connections where satellite transmission is not involved the one way end-to-end delay shall
be less than (10 + 0,01 G) ms, where G is the geographical distance in kilometres, as shown
in figure 1; or
b) for connections where satellite transmission is involved the one way end-to-end delay shall be
less than 350 ms.
NOTE 1: Requirements a) and b) are based on CCITT Recommendation G.114, subclauses 2.2
and 2.3.

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Delay (ms)
100
10
0
0 3 000 6 000 9 000
Geographical distance (km)
Figure 1: Upper limit of delay
There are no requirements for low frequency (below 20 Hz) variation of one way end-to-end delay under
this ETS.
NOTE 2: A requirement for low frequency (below 20 Hz) variation of one way end-to-end delay
may be added to this ETS when appropriate specifications become available.
Test: The test shall be conducted according to Annex A, subclause A.2.2.
5.1.7.2 Jitter
5.1.7.2.1 Jitter tolerance at the network input port
Requirement: The leased line shall function as specified with input jitter being the sum of two band limited
components as defined in table 2.
NOTE: The jitter tolerance for the connection is defined in this way instead of specifying single
jitter frequencies, for the following reasons:
a) this method is more representative of the jitter encountered in practice; and
b) long regenerator chains may be especially sensitive to single jitter frequencies.

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Table 2: Components of input jitter
Filters for generation of jitter Bandpass filter for measurement Input jitter measured
spectrum (first order) of input jitter by bandpass filter
Lower cut-off Upper cut-off (lower cutoff first order) UI peak-to-peak
(high pass) (low pass) (maximum)
Only low pass 4 Hz 4 Hz to 100 kHz 1,1 UI
40 Hz 100 kHz 40 Hz to 100 kHz 0,11 UI
Test: The test shall be conducted according to Annex A, subclause A.2.3.
5.1.7.2.2 Maximum jitter at the network output port
Requirement: The maximum jitter at the output port from the network shall not exceed the network limits
for the maximum output jitter as specified in table 3, when measured with first order linear filters with the
defined cut-off frequencies.
NOTE: This requirement is taken from CCITT Recommendation G.823.
Table 3: Maximum network output jitter
Measurement filter bandwidth Output jitter
Lower cut-off Upper cut-off UI peak-to-peak
(high pass) (low pass) (maximum)
20 Hz 100 kHz 1,5 UI
18 kHz 100 kHz 0,2 UI
Test: The test shall be conducted according to Annex A, subclause A.2.3.
5.1.7.3 Slip
Requirement: For at least one of two consecutive periods of 24 hours the number of slips shall be less
than 5.
NOTE: This requirement is based on CCITT Recommendation G.822, § 2 and table 1/G.822.
Test: The test shall be conducted according to Annex A, subclause A.2.4.
5.1.7.4 Error
NOTE: When microwave links are used in the connection it may not be possible to meet the
requirement in rare periods with very adverse propagation conditions.
5.1.7.4.1 Errored seconds
Requirement: For at least one of two consecutive 24 hours measuring periods, the number of errored
seconds shall be less than 2 889.
2
-
NOTE: This test limit corresponds to a mean errored seconds ratio
...