SIST ETS 300 766 E1:2005

SLOVENSKI STANDARD
SIST ETS 300 766 E1:2005
01-februar-2005
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Business TeleCommunications (BTC); Multiple 64 kbit/s digital unrestricted leased lines
with octet integrity presented at a structured 2 048 kbit/s interface at either or both ends
(D64M); Connection characteristics and network interface presentation
Ta slovenski standard je istoveten z: ETS 300 766 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST ETS 300 766 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 766 E1:2005

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SIST ETS 300 766 E1:2005
EUROPEAN ETS 300 766
TELECOMMUNICATION March 1998
STANDARD
Source: BTC Reference: DE/BTC-02067
ICS: 33.020
Key words: Digital, interface, leased line, ONP, testing
Business TeleCommunications (BTC);
Multiple 64 kbit/s digital unrestricted leased lines with octet
integrity presented at a structured 2 048 kbit/s interface
at either or both ends (D64M);
Connection characteristics and network interface presentation
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
Internet: secretariat@etsi.fr - http://www.etsi.fr - http://www.etsi.org
Tel.: +33 4 92 94 42 00 - Fax: +33 4 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 1998. All rights reserved.

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ETS 300 766: March 1998
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 Definitions and abbreviations .8
3.1 Definitions .8
3.2 Abbreviations .9
4 Overview (informative) .9
5 Connection characteristics .10
5.1 Summary of attributes.10
5.2 Information transfer rate .11
5.3 Information transfer susceptance .11
5.4 Structure and octet integrity .11
5.5 Establishment of connection.12
5.6 Symmetry.12
5.7 Transmission delay.12
5.8 Controlled slip .13
5.9 Errored seconds .13
5.10 Severely errored seconds.13
5.11 Availability .13
6 Interface characteristics - 2 048 kbit/s interface.13
6.1 Connection arrangements .13
6.2 Frame structure .14
6.2.1 General.14
6.2.2 2 048 kbit/s digital structured ONP leased line (CRC-4) .14
6.2.3 Use of the E-bits.14
6.2.4 Frame synchronization and data transmission capability.14
6.2.5 Multiframe alignment.14
6.3 Output signal coding .14
6.4 Output waveform shape.15
6.5 Output timing.15
6.6 Output timing under failure conditions .15
6.7 Output impedance towards ground.15
6.8 Output jitter .15
6.9 Input signal coding.15
6.10 Input return loss .15
6.11 Input loss tolerance.15
6.12 Input immunity against reflections .15
6.13 Tolerable longitudinal voltages .16
6.14 Impedance towards ground .16
6.15 Input jitter tolerance .16
7 Interface characteristics - 64 kbit/s interface.16
7.1 Connection arrangements .16
7.2 Output signal coding and octet structure .16
7.3 Output waveform shape.16
7.4 Output timing.16
7.5 Output timing under failure conditions .16
7.6 Output jitter .17

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7.7 Impedance towards ground. 17
7.8 Longitudinal conversion loss . 17
7.9 Input signal coding and octet structure . 17
7.10 Input jitter tolerance. 17
7.11 Input return loss. 17
7.12 Input loss tolerance . 17
7.13 Immunity against reflections. 17
7.14 Impedance towards ground. 17
7.15 Longitudinal conversion loss . 18
8 Safety. 18
8.1 General requirements . 18
8.2 Touch current . 18
9 ElectroMagnetic Compatibility (EMC) . 18
Annex A (normative): Test methods. 19
A.1 General. 19
A.1.1 Additional information to support the test. 19
A.1.2 Equipment connection.19
A.2 Main test . 19
Annex B (informative): Bibliography . 21
History. 22

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Business
TeleCommunications (BTC) Technical Committee of the European Telecommunications Standards
Institute (ETSI).
This ETS resulted from a mandate from the Commission of the European Community (CEC) to provide
harmonized standards for the support of the Directive on Open Network Provision (ONP) of leased lines
(92/44/EEC).
There are six other standards directly related to this ETS:
ETS 300 288: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet
integrity (D64U); Network interface presentation";
ETS 300 289: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet
integrity (D64U); Connection characteristics";
ETS 300 290: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet
integrity (D64U); Terminal equipment interface";
ETS 300 418 (1995): "Business TeleCommunications (BTC); 2 048 kbit/s digital unstructured and
structured leased lines (D2048U and D2048S); Network interface presentation".
ETS 300 419 (1995): "Business TeleCommunications (BTC); 2 048 kbit/s digital structured leased lines
(D2048S); Connection characteristics".
ETS 300 420 (1995): "Business TeleCommunications (BTC); 2 048 kbit/s digital structured leased lines
(D2048S); Terminal equipment interface".
This ETS is based on information from CCITT Recommendations and ETSI publications and the relevant
documents are quoted where appropriate.
This ETS has been written as a "delta" document to the existing standards for 64 kbit/s and 2 048 kbit/s
leased lines. It uses requirements from these standards by cross reference with modifications as
necessary to the test. The configurations covered by this ETS could have been addressed by modifying
the existing standards for 64 kbit/s and 2 048 kbit/s leased lines to make them more modular so that the
64 kbit/s connection characteristics could be used in conjunction with the 2 048 kbit/s structured interface.
In some ways this would have been a tidier solution, but it would involve considerable additional activity
because the existing standards for 64 kbit/s and 2 048 kbit/s leased lines are currently the subject of
regulation and references to them in the annex of the ONP leased line Directive would have to be
changed.
Transposition dates
Date of adoption of this ETS: 6 March 1998
Date of latest announcement of this ETS (doa): 30 June 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1998
Date of withdrawal of any conflicting National Standard (dow): 31 December 1998
Introduction
The Council Directive on the application of ONP to leased lines (92/44/EEC) concerns the harmonization
of conditions for open and efficient access to, and use of, the leased lines provided over public
telecommunications networks and the availability throughout the European Union (EU) of a minimum set
of leased lines with harmonized technical characteristics.

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Other countries outside the EU may also choose to provide leased lines according to the standards
produced to support the Directive.
The consequence of the Directive is that telecommunications organizations within the EU 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 (TE)for
connection to these leased lines will be required to fulfil certain essential requirements.
The leased line specified in this ETS is not included in the minimum set whose provision is required under
Directive 92/44/EEC, however this standard is written as a "delta" document based on the specifications
for the 2 048 kbit/s digital structured ONP leased line (D2048S) and 64 kbit/s digital unrestricted ONP
leased line with octet integrity (D64U) leased lines.
ETS 300 166 and CCITT Recommendation G.703 are used as the basis for the interface presentation
requirements. ETS 300 167, CCITT Recommendations G.704 and G.706 are used as the basis for the
structure of the 2 048 kbit/s interface.
This ETS does not apply to terminal equipment. ETS 300 290 applies without modification to TE intended
for connection to the 64 kbit/s interface of the leased line. In theory ETS 300 420 should be modified to
define the time slot structure for terminals intended for connection to 2 048 kbit/s interfaces that present
64 kbit/s leased lines. However, the modification is too trivial to be worth implementing.

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1 Scope
This European Telecommunication Standard (ETS) specifies the technical requirements and test
principles for the connection characteristics and network interface presentations of a 64 kbit/s
-
point-to point digital unrestricted leased line with octet integrity that is provided between either:
- two 2 048 kbit/s structured network interfaces; or
- a 2 048 kbit/s structured network interface and a 64 kbit/s co-directional network interface.
More than one leased line of the type described in this ETS may be provided at any 2 048 kbit/s network
interface. Such leased lines may connect to the same or different destinations.
This ETS is written as a "delta" document based on the following ETSs:
- ETS 300 288: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with
octet integrity (D64U); Network interface presentation". [1]
- ETS 300 289: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with
octet integrity (D64U); Connection characteristics". [2]
- ETS 300 418: "Business TeleCommunications (BTC); 2 048 kbit/s digital unstructured and
structured leased lines (D2048U and D2048S); Network interface presentation". [3]
- ETS 300 419: "Business TeleCommunications (BTC); 2 048 kbit/s digital structured leased lines
(D2048S); Connection characteristics". [4]
This ETS is applicable to leased lines, including part time leased lines, whose establishment or release
does not require any protocol exchange or other intervention at the Network Termination Point (NTP).
This ETS covers the connection characteristics, and the mechanical and electrical characteristics of the
network interface, and specifies conformance tests. Some of the tests for the interface presentation
described in this ETS are not designed to be applied to the interface of an installed leased line; such tests
may be applied to equipment of the kind used to provide the interface. This ETS does not include details
concerning the implementation of the tests nor does it include information on any regulations concerning
testing.
NOTE: There is no requirement for each leased line to be tested in accordance with this ETS
before it is brought into, or returned into, service.
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] ETS 300 288 (1994) including Amendment 1 (1995): "Business
TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet
integrity (D64U); Network interface presentation".
[2] ETS 300 289 (1994): "Business TeleCommunications (BTC); 64 kbit/s digital
unrestricted leased line with octet integrity (D64U); Connection characteristics".
[3] ETS 300 418 (1995): "Business TeleCommunications (BTC); 2 048 kbit/s digital
unstructured and structured leased lines (D2048U and D2048S); Network
interface presentation".
[4] ETS 300 419 (1995): "Business TeleCommunications (BTC); 2 048 kbit/s digital
structured leased lines (D2048S); Connection characteristics".

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[5] EN 60950: "Safety of information technology equipment, including electrical
business equipment".
[6] ETS 300 046-4 (1992): "Integrated Services Digital Network (ISDN); Primary
rate access - safety and protection, Part 4: Interface Ib - safety".
[7] CCITT Recommendation I.410 (1988): "General aspects and principles relating
to Recommendations on ISDN user-network interfaces".
[8] CCITT Recommendation O.151 (1992): "Error performance measuring
equipment operating at the primary rate and above".
[9] CCITT Recommendation O.152 (1988): "Error performance measuring
equipment for bit rates of 64 kbit/s and N · 64 Kbits/s"
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 B. In some cases the same publication may have been referenced in
both a normative and an informative manner.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
errored second: A second with one or more bit errors.
frame: a sequence of 256 bits of which the first 8 bits define the frame structure
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.
octet slip: a slip of one complete octet.
15
PRBS(2 -1): A Pseudo Random Bit Sequence (PRBS) as defined in subclause 2.1 of CCITT
Recommendation O.151 [8].
11
PRBS(2 -1): A Pseudo Random Bit Sequence (PRBS) as defined in subclause 2.1 of CCITT
Recommendation O.152 [9].
Safety Extra-Low Voltage (SELV) circuit: A secondary circuit which is so designed and protected that
under normal and single fault conditions, the voltage between any two accessible parts and, for class 1
equipment, between any accessible part and the equipment protective earthing terminal does not exceed
a safe value (subclause 1.2.8.5 of EN 60950 [5]).
severely errored second: A second where at least 0,1 % of the bits are errored.
slip: One or more extra or missing consecutive unit intervals in the bit stream.
time slot: In the context of this ETS, a time slot is a period of nominally 3,90625 ms (8 bits). Each frame of
nominally 125 ms is subdivided into 32 time slots numbered 0-31.
terminal equipment: Equipment intended to be connected to the public telecommunications network, i.e.:

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- to be connected directly to the termination of a public telecommunication network; or
- to interwork with a public telecommunications network being connected directly or indirectly to the
termination of a public telecommunications network, in order to send, process, or receive
information.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CRC-4 Cyclic Redundancy Check (using four bits)
D2048S 2 048 kbit/s digital structured ONP leased line
D64M Multiple 64 kbit/s digital unrestricted leased lines with octet integrity at a
structured 2 048 kbit/s interface at either or both ends
D64U 64 kbit/s digital unrestricted ONP leased line with octet integrity
EMC ElectroMagnetic Compatibility
NTP Network Termination Point
ONP Open Network Provision
PRBS Pseudo Random Bit Sequence
SELV Safety Extra-Low Voltage
TE Terminal Equipment
4 Overview (informative)
This ETS applies to 64 kbit/s leased lines where at least one end is presented in a 2 048 kbit/s interface.
This includes leased lines in a wide variety of cases and configurations such as:
- a number of 64 kbit/s leased lines presented in a single 2 048 kbit/s interface at one location but
each connecting to a different location;
- a single 64 kbit/s leased line presented in a single 2 048 kbit/s interface at each end where other
time slots in the interfaces are used for other services;
- a number of 64 kbit/s leased lines between the same 2 048 kbit/s interfaces. In this case there is no
guarantee that the leased lines will follow the same route and have the same transmission delay,
i.e. octets of data that share the same frame at the input will not necessarily share the same frame
at the output. An example is shown in figure 1.
2 048 kbit/s interface
2 048 kbit/s interface
NTP
NTP
64 kbit/s interface
NTP
64 kbit/s interface
NTP
Figure 1

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Where there are 64 kbit/s leased lines to different destinations, each of the leased lines is point-to-point;
there is no broadcasting or point-to-multipoint capability.
This ETS has been written as a "delta" document to the existing standards for 64 kbit/s and 2 048 kbit/s
leased lines. It uses requirements from these standards by cross reference with modifications as
necessary to the test. The configurations covered by this ETS could have been addressed by modifying
the existing standards for 64 kbit/s and 2 048 kbit/s leased lines to make them more modular so that the
64 kbit/s connection characteristics could be used in conjunction with the 2 048 kbit/s structured interface.
In some ways this would have been a tidier solution, but it would involve considerable additional activity
because the existing standards for 64 kbit/s and 2 048 kbit/s leased lines are currently the subject of
regulation and references to them in the annex of the ONP leased line Directive would have to be
changed.
5 Connection characteristics
The performance of the leased line shall comply with the requirements of this clause, only if the conditions
of supply of the network equipment that provides the NTP are met, (e.g. if the equipment is connected to
an appropriate power supply on the customer's premises).
The ITU-T attribute technique is used to express the connection requirements. The following attributes
from CCITT Recommendation I.140 [7] are considered relevant for this ETS:
- information transfer rate;
- information transfer susceptance;
- structure;
- establishment of connection;
- symmetry;
- 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;
- octet slip;
- error.
5.1 Summary of attributes
The connection attributes are displayed in table 1. In effect, these attributes define the service being
offered.

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The values and the associated compliance tests can be found in the subsequent subclauses.
Table 1: Connection attributes
Connection type attributes Value
Description Nature Reference subclause:
Information transfer rate 64 kbit/s See 5.2
Information transfer susceptance Unrestricted digital See 5.3
Structure Separate octets See 5.4, 6.2, 7.2
Establishment of connection Without user intervention See 5.4
Symmetry Symmetrical in both See 5.5
directions
Communication configuration Point-to-point Scope and 4
Network performance sub-attributes Value
Description Nature Reference subclause:
Transmission delay Terrestrial and satellite See 5.7
options
Jitter Input and output ports See 6.8, 6.7, 7.5, 7.9
Octet slip 5 per 24 hour period See 5.8
Error parameters
Time interval with errored blocks Value
Description Nature Reference subclause:
Errored seconds 5 324 per 24 hour period See 5.9
Severely errored seconds 105 per 24 hour period See 5.10
5.2 Information transfer rate
Requirement: The connection shall be capable of transferring information at a nominal information rate of
64 kbit/s.
Test: The test shall be conducted according to annex A, subclause A.2.
5.3 Information transfer susceptance
Requirement: The leased line connection shall be capable of transferring unrestricted digital information.
Test: The test shall be conducted according to annex A, subclause A.2.
5.4 Structure and octet integrity
Where there is a 2 048 kbit/s interface at each end of the leased line, it is not a requirement that the
leased line shall be presented in the same time slot at each interface.
Requirement: For each direction of transmission, the leased line shall convey each octet of information
from its input bit stream, or in the case of a 2 048 kbit/s interface at the input, each octet of information in
the time slot assigned to the leased line, and present each octet as a single and complete octet in the
same order at the output. In the case where there is a 2 048 kbit/s interface at the leased line output, this
octet shall be wholly contained in a single timeslot.
Where there is a 2 048 kbit/s interface at one end of the leased line and a 64 kbit/s interface at the other
end, for each direction of transmission, the bit at the start (i.e. closest to the lower numbered time slot) of
the time slot assigned to the leased line at of the 2 048 kbit/s interface shall correspond to the bit at the
start of each octet in the 64 kbit/s interface.
The order of the bits within each octet and the order of octets shall be maintained

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NOTE: This requirement is
...