ETSI ETS 300 288 ed.1 (1994-01)

SLOVENSKI STANDARD
SIST ETS 300 288:1999
01-november-1999

Poslovne telekomunikacije (BTC) - Digitalni zakupljeni vodi za prenosno hitrost 64

Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with octet

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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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.

Foreword...........................................................................................................................................5

Introduction ........................................................................................................................................5

1 Scope ......................................................................................................................................7

2 Normative references ................................................................................................................7

3 Definitions................................................................................................................................. 8

4 Symbols and abbreviations.........................................................................................................8

5 Requirements............................................................................................................................9

5.1 Physical characteristics ...............................................................................................9

5.1.1 Connector specification.............................................................................9

5.1.2 Hardwired connection ............................................................................. 10

5.2 Electrical characteristics ............................................................................................ 10

5.2.1 Output port............................................................................................ 10

5.2.1.1 Signal coding.................................................................. 10

5.2.1.2 Waveform shape ............................................................ 10

5.2.1.3 Output timing.................................................................. 12

5.2.1.4 Output timing under failure conditions ............................... 12

5.2.1.5 Output return loss........................................................... 12

5.2.1.7 Longitudinal conversion loss............................................. 12

5.2.1.8 Output signal balance...................................................... 12

5.2.2 Input port............................................................................................... 13

5.2.2.1 Signal coding.................................................................. 13

5.2.2.2 Input timing and jitter tolerance ........................................ 13

5.2.2.3 Input return loss.............................................................. 13

5.2.2.4 Input loss tolerance......................................................... 13

5.2.2.5 Immunity against reflections............................................. 13

5.2.2.7 Longitudinal conversion loss............................................. 14

5.3 Safety...................................................................................................................... 14

5.3.1 General requirements ............................................................................. 14

5.3.2 Touch current......................................................................................... 14

5.4 Overvoltage protection .............................................................................................. 15

5.4.1 Surge simulation, common mode ............................................................. 15

5.4.2 Surge simulation, transverse mode between transmit and receive pairs...... 15

5.4.3 Mains simulation, common mode ............................................................. 15

5.4.4 Mains simulation, transverse mode .......................................................... 15

5.4.5 Impulse transfer from mains, common mode ............................................ 16

5.4.6 Impulse transfer from mains, transverse mode ......................................... 16

5.4.7 Conversion of common mode to transverse mode..................................... 16

5.5 Electromagnetic compatibility..................................................................................... 16

Annex A (normative): Test methods ............................................................................................. 17

A.1 General .................................................................................................................................. 17

A.1.1 Additional information to support the test..................................................................... 17

A.1.2 Equipment connection................................................................................................ 17

A.2 Test methods.......................................................................................................................... 17

A.2.1 Signal coding at output port........................................................................................ 17

A.2.2 Waveform shape at output port ..................................................................................18

A.2.3 Output timing under failure conditions..........................................................................19

A.2.4 Input coding, loss tolerance and immunity against reflections ........................................19

A.2.5 Return loss at input port.............................................................................................20

A.2.6 Longitudinal conversion loss .......................................................................................21

A.2.7 Impedance towards ground........................................................................................ 22

Annex B (normative): Code conversion rules ................................................................................. 23

Annex C (informative): Bibliography................................................................................................24

History .............................................................................................................................................25

TeleCommunications (BTC) Technical Committee of the European Telecommunications Standards Institute

This ETS resulted 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

ETS 300 289: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with

ETS 300 290: "Business TeleCommunications (BTC); 64 kbit/s digital unrestricted leased line with

This ETS is based on information from CCITT Recommendations and ETSI publications and the relevant

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 over public telecommunications networks and the availability throughout the Community (EEC) of

Other countries outside the EEC may also choose to provide leased lines according to the standards

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.

ETS 300 166 and CCITT Recommendation G.703 are used as the basis for the interface presentation

This ETS specifies the technical requirements and test principles for the network interface presentations of

Open Network Provision (ONP) 64 kbit/s digital unrestricted leased lines with octet integrity. These

A connection is presented via interfaces at Network Termination Points (NTP). This ETS defines the

network interface presented by the leased line provider and should be used in conjunction with the

companion standard, ETS 300 289 [6], which specifies the connection characteristics between the NTPs of

This ETS is applicable to leased lines, including part time leased lines, whose establishment or release

This ETS covers the physical, mechanical and electrical characteristics of the network interface and

specifies the conformance tests for equipment of the kind that provides the interface presentation. Some of

the tests 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. There is no requirement for each leased line to be tested in accordance with this ETS

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

unrestricted leased line with octet integrity (D64U), Connection characteristics".

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

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

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

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

Terminal Equipment (TE): equipment intended to be connected to the public telecommunications network,

a) to be connected directly to the termination of a public telecommunication network; or

b) to interwork with a public telecommunications network being connected directly or indirectly to

PRBS(2 -1) Pseudo Random Bit Sequence (as defined in § 2.1 of CCITT Recommendation

RX Receive (a signal input at either the leased line interface or the test equipment,

TX Transmit (a signal output at either the leased line interface or the test equipment,

The 64 kbit/s unrestricted leased line provides a bidirectional, point-to-point digital leased line with a usable

bit rate of 64 kbit/s and octet integrity, where the output timing is provided from the network. The interface

NOTE: If equipment providing the interface requires a mains supply, the leased line provider

should bring this to the attention of the user so that the user can provide mains supply

The physical connection arrangements shall be by a socket; however at the request of the user, and with

agreement of the leased line provider, an alternative means of connection may be provided, which shall

The use on the terminal equipment side of the interface of shielded cables may be necessary to meet

radiation and immunity requirements defined in Electro-Magnetic Compatibility (EMC) standards.

Therefore, the NTP may provide a point, or points, to which the shield, or shields, of the cable on the

NOTE: The purpose of these points (if present) is to provide a path from the shield to a

Requirement: Where a connector is specified as the means of termination of the leased line, the network

interface shall provide an 8-contact socket of the type specified in ISO/IEC 10173 [7] with contact

NOTE: The transmit pair is the output from the network interface. The receive pair is the input to the

network interface, as shown in figure 1. Where the terms "output" and "input" are used without

Test: There shall be a visual inspection that the socket is of the correct type. The contact assignments are

Requirement: Where one or more leased lines are being terminated as hardwired connections, these

connections shall be via an insulation displacement terminal block provided by the leased line provider. The

leased line provider shall provide information on the configuration of the insulation displacement terminals

NOTE: All subsequent tests are carried out via the appropriate connection method.

Requirement: The signal transmitted at the output port shall comply with the encoding rules given in

NOTE: When there is no input signal or octet timing is not present at the leased line distant

input or when there is a failure in the leased line connection, the octet timing at the

Requirement: The pulse at the output port shall comply with the requirements given in table 2 and

Requirement: Under normal operating conditions, the timing of the output signal shall be network timing.

NOTE: Network timing is timing that is derived from the source or sources of timing that are

used for the whole network. Therefore, the timing provided by the leased line will be

Requirement: When there is a failure within the network and if a signal is presented at the interface

NOTE: A requirement for output return loss may be added to this ETS when appropriate

Requirement: The impedance towards ground of the output port shall be greater than 1 000 Ω for

frequencies in the range of 10 Hz to 1 MHz when measured with a sinusoidal test voltage of 2 V rms.

Where a shield reference point is provided, ground shall be pins 3 and 6 on the connecting socket or the

equivalent reference point on a hardwired connection. Where a shield reference point is not provided, the

Requirement: The longitudinal conversion loss of the output port shall be greater than or equal to the

figures given in table 3. Where a shield reference point is provided, ground shall be pins 3 and 6 on the

connecting socket or the equivalent reference point on a hardwired connection. Where a shield reference

point is not provided, the leased line provider shall declare the point to be used for testing.

NOTE: The effects of the output signal imbalance are covered under the EMC Directive

Requirement: The input port shall accept, without error, signals encoded in accordance with encoding

NOTE: The output signal is not defined when there is no input signal or octet timing present at

The requirement for input timing and jitter tolerance is given in the companion standard ETS 300 289 [6].

Requirement: The input return loss with respect to 120 Ω at the interface shall be greater than or equal to

Requirement: The input port shall correctly operate, without errors, with a 64 kbit/s input signal as defined

in subclauses 5.2.1.1 and 5.2.1.2 above but modified by an intervening pair with the following

a) attenuation that follows a ´f law with values throughout the range from 0 dB to 3 dB at 128 kHz; and

b) characteristic impedance of 120 Ω with a tolerance of ± 20 % in the frequency range from 200 kHz

Requirement: When a signal comprising a combination of a normal signal and an interfering signal is

applied to the input port, via an artificial cable with a loss in the range from 0 dB to 3 dB at 128 kHz, no

The normal signal shall be a signal encoded according to Annex B, shaped according to the masks of

figures 2 and 3, with a binary content in accordance with a Pseudo Random Bit Sequence as defined in

The interfering signal shall be the same as the normal signal except that the level shall be attenuated by

20 dB, the bit rate shall be within 64 kbit/s ± 100 ppm, and the timing shall not be synchronised to the

Requirement: The impedance towards ground of the input port shall be greater than 1 000 Ω for

frequencies in the range from 10 Hz to 1 MHz when measured with a sinusoidal test voltage of 2 V rms.

Where a shield reference point is provided, ground shall be pins 3 and 6 on the connecting socket or the

equivalent reference point on a hardwired connection. Where a shield reference point is not provided, the

Requirement: The longitudinal conversion loss of the input port shall be greater than or equal to the

figures given in table 5. Where a shield reference point is provided, ground shall be pins 3 and 6 on the

connecting socket or the equivalent reference point on a hardwired connection. Where a shield reference

point is not provided, the leased line provider shall declare the point to be used for testing.

The tests associated with the requirements in this subclause are not suitable for use on installed leased

lines. Such tests may be applied to equipment of the kind used to provide the interface.

Requirement: The leased line interface shall comply with the requirements for accessible parts of a SELV

NOTE: Designers should take into account the minimum impedance towards ground specified

This requirement recognises the fact that the equipment providing the NTP is likely to have a mains

electricity supply interface. If the equipment providing the NTP does not have a mains supply, this

For the purpose of the following requirement the connection point for the interface cable shield as defined

in ETS 300 046-4 [4] shall be pins 3 and 6 on the connecting socket or the equivalent reference point with

Requirement: The touch current measured across the leased line interface shall not exceed 0,25 mA.

Overvoltage protection shall be tested in accordance with the methods described in ETS 300 046-5 [5] as

detailed below. The tests associated with these requirements are not suitable for use on installed leased

lines. The compliance criteria for the overvoltage protection tests of subclauses 5.4.1 to 5.4.7, based on

The leased line interface shall operate properly within the limits of this specification and the

- reloading of data other than data of a type declared in the operating instructions to be

For the purpose of the following subclauses on protection, the term referred to as Ib in ETS 300 046-5 [5]