Business TeleCommunications (BTC); 34 Mbit/s digital unstructured and structured leased lines (D34U and D34S); Attachment requirements for terminal equipment interface

Specification of the attachment requirement for connection of the terminal equipment to the public network and test methods for compliance.

Poslovne telekomunikacije (BTC) - Digitalni zakupljeni vodi za prenosno hitrost 34 Mbit/s ter za nestrukturirane in strukturirane signale (D34U in D34S) - Priključitvene zahteve za vmesnik terminalske opreme

General Information

Status
Published
Publication Date
30-Sep-2004
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Oct-2004
Due Date
01-Oct-2004
Completion Date
01-Oct-2004
Mandate

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SIST TBR 024 E1:2004
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SLOVENSKI STANDARD
SIST TBR 024 E1:2004
01-oktober-2004

3RVORYQHWHOHNRPXQLNDFLMH %7& 'LJLWDOQL]DNXSOMHQLYRGL]DSUHQRVQRKLWURVW

0ELWVWHU]DQHVWUXNWXULUDQHLQVWUXNWXULUDQHVLJQDOH '8LQ'6 
3ULNOMXþLWYHQH]DKWHYH]DYPHVQLNWHUPLQDOVNHRSUHPH
Business TeleCommunications (BTC); 34 Mbit/s digital unstructured and structured
leased lines (D34U and D34S); Attachment requirements for terminal equipment
interface
Ta slovenski standard je istoveten z: TBR 024 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST TBR 024 E1:2004 en

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

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SIST TBR 024 E1:2004
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SIST TBR 024 E1:2004
TECHNICAL TBR 24
BASIS for July 1997
REGULATION
Source: ETSI TC-BTC Reference: DTBR/BTC-02056
ICS: 33.040.40

Key words: Access, digital, interface, leased line, ONP, terminal, testing, type approval

Business TeleCommunications (BTC);
34 Mbit/s digital unstructured and structured leased lines
(D34U and D34S);
Attachment requirements for terminal equipment interface
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
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: secretariat@etsi.fr
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 1997. All rights reserved.
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TBR 24: July 1997

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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SIST TBR 024 E1:2004
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TBR 24: July 1997
Contents

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

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

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

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

3 Definitions and abbreviations ..............................................................................................................7

3.1 Definitions ............................................................................................................................7

3.2 Abbreviations .......................................................................................................................8

4 Requirements......................................................................................................................................9

4.1 Mechanical characteristics...................................................................................................9

4.2 Electrical characteristics ....................................................................................................10

4.2.1 Output port ....................................................................................................10

4.2.1.1 Signal coding .......................................................................10

4.2.1.2 Waveform shape .................................................................10

4.2.1.3 Output timing .......................................................................11

4.2.1.4 Output jitter ..........................................................................11

4.2.1.5 Output frame structure.........................................................12

4.2.2 Input port .......................................................................................................12

4.3 Safety.................................................................................................................................13

4.4 Overvoltage protection.......................................................................................................13

4.5 ElectroMagnetic Compatibility (EMC) ................................................................................13

Annex A (normative): Test methods......................................................................................................14

A.1 General..............................................................................................................................................14

A.1.1 Equipment connection .......................................................................................................14

A.1.2 Test environment ...............................................................................................................14

A.2 Test methods ....................................................................................................................................15

A.2.1 Signal coding at the output port .........................................................................................15

A.2.2 Waveform shape at the output port ...................................................................................15

A.2.3 Output timing......................................................................................................................16

A.2.4 Output jitter ........................................................................................................................17

A.2.5 Frame structure .................................................................................................................18

Annex B (normative): Definition of HDB3 code .....................................................................................19

B.1 General..............................................................................................................................................19

B.2 Definition ...........................................................................................................................................19

Annex C (normative): Definition of frame structure ...............................................................................20

C.1 Frame structure at 34 368 kbit/s .......................................................................................................20

Annex D (normative): TBR Requirements Table (TBR-RT)..................................................................21

Annex E (informative): Bibliography........................................................................................................22

History..........................................................................................................................................................23

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TBR 24: July 1997
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SIST TBR 024 E1:2004
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TBR 24: July 1997
Foreword

This Technical Basis for Regulation (TBR) has been produced by the Business TeleCommunications

(BTC) Technical Committee, in conjunction with the Terminal Equipment (TE) and Transmission and

Multiplexing (TM) Technical Committees, of the European Telecommunications Standards Institute

(ETSI).

This TBR resulted from a mandate from the Commission of the European Community (CEC) to provide

harmonized standards for the support of the Second Phase Directive (91/263/EEC).

This TBR is based on information from ITU-T 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 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 of

a minimum set of leased lines with harmonized technical characteristics.

At the date of publication of this TBR, the 34 Mbit/s unstructured and structured leased lines are not part

of the minimum set of leased lines under the Leased Line Directive and it is not planned that they will be

added to the minimum set.

Two classes of standard will be used for the interfaces of terminal equipment designed for connection to

the ONP leased lines. European Telecommunications Standards (ETSs), which are voluntary, give the full

technical specifications for these interfaces, whereas TBRs give the essential requirements under the

Second Phase Directive (91/263/EEC) for attachment to the leased lines. This TBR is a subset of the

corresponding ETS 300 689.

ETS 300 166 and ITU-T Recommendation G.703 are used as the basis for the terminal equipment

interface.
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TBR 24: July 1997
1 Scope

This TBR specifies the attachment requirements and the corresponding conformance tests for a terminal

equipment interface for:

- connection to the Network Termination Points (NTPs) of 34 368 kbit/s digital unstructured leased

lines (D34U); and

- connection to the NTPs of 34 368 kbit/s digital structured leased lines (D34S) with an information

transfer rate of 33 920 kbit/s without restriction on binary content.
These leased lines are defined in ETS 300 686 and ETS 300 687.

The term "attachment requirements" in the context of this TBR refers to the essential requirements for

access that apply under articles 4d and 4f of the Second Phase Directive (91/263/EEC). Conformance to

these requirements does not guarantee end-to-end interoperability. Essential requirements under articles

4c and 4e are not applicable to this TBR.

This TBR is applicable to all interfaces intended for connection to the D34U or D34S leased line. It covers

the essential requirements for the mechanical and electrical characteristics of the terminal equipment

interface. Interfaces intended only for connection to the D34U leased lines which do not comply with the

specified requirements on output structure, do not satisfy the attachment requirements for connection to

the D34S leased line.

Customer premises wiring and installation between the terminal equipment and the NTP are outside the

scope of this TBR.
2 Normative references

This TBR 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 TBR only when incorporated into it by amendment or revision. For undated references the

latest edition of the publication referred to applies.
[1] ITU-T Recommendation G.703 (1991): "Physical/electrical characteristics of
hierarchical digital interfaces".
[2] ITU-T Recommendation O.151 (1992): "Error performance measuring
equipment for digital systems at the primary rate and above".
[3] ITU-T Recommendation O.171 (1992): "Timing jitter measuring equipment for
digital systems".

NOTE: This TBR 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 E. 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 TBR, the following definitions apply:

frame: A repetitive set of consecutive bits in which the position of each bit can be identified by reference

to a frame alignment signal.

frame alignment signal: The distinctive signal inserted in every frame always occupying the same

relative position within the frame and used to establish and maintain frame alignment.

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TBR 24: July 1997

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.
23-1

PRBS(2 ): A Pseudo Random Bit Sequence (PRBS) (as defined in subclause 2.2 of ITU-T

Recommendation O.151 [2]).

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).

terminal equipment: Equipment intended to be connected to the public telecommunications network, i.e.:

- 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 TBR, the following abbreviations apply:
ac alternating current
AMI Alternate Mark Inversion
BNC Bayonet Nut Connector
D34S 34 Mbit/s digital structured leased line
D34U 34 Mbit/s digital unstructured leased line
dc direct current
EMC ElectroMagnetic Compatibility
FA1 Frame Alignment byte 1
FA2 Frame Alignment byte 2
HDB3 High Density Bipolar code 3
LSB Least Significant Bit
MSB Most Significant Bit
NTP Network Termination Point
ONP Open Network Provision
ppm parts per million
PRBS Pseudo Random Bit Sequence
RDI Remote Defect Indication
REI Remote Error Indication
RX RX is a signal input (at either the terminal equipment or the test equipment,
see figure 1)
SELV Safety Extra-Low Voltage
TBR-RT TBR-Requirements Table

TX TX is a signal output (at either the terminal equipment or the test equipment,

see figure 1)
UI Unit Interval
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TBR 24: July 1997
4 Requirements
The terminal equipment is for use with D34U or D34S leased lines.

The D34U 34 368 kbit/s unstructured leased line provides a bi-directional point-to-point digital connection

with an information transfer rate of 34 368 kbit/s without restriction on binary content. Any structuring of

the data is the responsibility of the user.

The D34S 34 368 kbit/s structured leased line provides a bi-directional point-to-point digital connection

with an information transfer rate of 33 920 kbit/s without restriction on binary content. Any structuring of

the data within the transparent 33 920 kbit/s part of the frame is the responsibility of the user.

For both D34U and D34S the provision of timing is the responsibility of the user; however, in certain

installations the leased line provider may be able to offer a leased line that is synchronized to the network.

4.1 Mechanical characteristics

Justification: Without a means of connection, it is impossible for the terminal equipment to connect to the

network, therefore this is included in order for the terminal equipment to interwork with the network

(article 4f).

Requirement: The terminal equipment interface shall provide two coaxial 75 Ω connectors, one each for

transmit and receive.

There is no requirement under this TBR for a particular plug or socket to be provided on the terminal

equipment.
NOTE 1: ETS 300 689 specifies that the terminal equipment shall provide either:
- two coaxial sockets, one each for transmit and receive; these sockets being
either 75 Ω sockets complying with IEC 169-13 or 75 Ω Bayonet Nut Connector
(BNC) sockets; or
- two coaxial plugs at the end of a cord (or cords), one each for transmit and
receive; these plugs being either 75 Ω plugs complying with IEC 169-13 or 75 Ω
BNC plugs.

NOTE 2: The transmit pair is the output from the terminal equipment interface. The receive pair

is the input to the terminal equipment interface, as shown in figure 1. Where the terms

"output" and "input" are used without qualification in this TBR, they refer to the terminal

equipment interface.

NOTE 3: Normal practice is for the outer conductors of the input and output connectors to be

connected via a dc path to the signal ground and thence to ground. This connection is

to reduce EMC emissions. If there is a difference in ground potential between the

terminal equipment and the NTP, this arrangement may result in high currents in the

outer conductors and cause damage.
To prevent this problem, dc isolation may be introduced between the terminal
equipment and the NTP, for example by introducing dc isolation between the outer

conductor and the signal ground in the terminal equipment. Careful attention should be

given to the requirements of standards on installation earthing practice.
OUTPUT INPUT
TX RX
TERMINAL
NETWORK
EQUIPMENT
INTERFACE
INTERFACE
RX TX
INPUT OUTPUT
Figure 1
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TBR 24: July 1997
Test: There shall be a visual inspection that two 75 Ω connectors are provided.
4.2 Electrical characteristics
4.2.1 Output port
4.2.1.1 Signal coding

Justification: The correct signal coding is necessary for the output signals from the terminal equipment to

be recognized correctly at the input to the NTP. Failure to provide the correct coding may cause error

reports within the network. A requirement on signal coding is therefore included in order to prevent harm

to the network (article 4d).

Requirement: The signal transmitted at the output port shall comply with the High Density Bipolar code 3

(HDB3) encoding rules (see annex B).
Test: The test shall be conducted according to subclause A.2.1.
4.2.1.2 Waveform shape

Justification: The correct waveform shape both limits the voltages to line and ensures correct recognition

of the pulses. Incorrect recognition of pulses may cause error reports within the network. A requirement on

waveform shape is therefore included in order to prevent harm to the network (article 4d).

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

table 1; based on ITU-T Recommendation G.703.
17 ns
(14,55 + 2,45)
0,2
0,1
1,0
8,65 ns
0,1
(14,55 - 5,90)
0,2
Nominal
pulse
14,55 ns
0,5
12,1 ns
(14,55 - 2,45)
24,5
0,1 0,1
(14,55 + 9,95)
0,1 0,1
0,2
29,1 ns
(14,55 + 14,55)
Figure 2: Pulse mask for 34 Mbit/s pulse
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TBR 24: July 1997
Table 1: Waveform shape at output port

Pulse shape (nominally rectangular) All marks of a valid signal shall conform with the

mask (see figure 2). The value V corresponds to the
nominal peak voltage of a mark.
Test load impedance
75 Ω non-reactive
Nominal peak voltage V of a mark 1,0 V
Peak voltage of a space 0 ± 0,1 V
Nominal pulse width 14,55 ns
Ratio of the amplitudes of positive and negative 0,95 to 1,05
pulses at the centre of the pulse interval
Ratio of the widths of positive and negative pulses 0,95 to 1,05
at the nominal half amplitude
Test: The test shall be conducted according to subclause A.2.2.
4.2.1.3 Output timing

Justification: Pulses at the wrong bit rate may not be properly recognized and may cause error reports

within the network. A requirement on output timing is therefore included in order to prevent harm to the

network (article 4d).
The terminal equipment may derive its timing from:
a) an internal source (e.g. an internal clock);
b) an external reference signal input;
c) the received signal at the input port.

Requirement: For each of the timing arrangements intended for use, the bit rate at the output port shall

be within the limits of 34 368 kbit/s ± 20 parts per million (ppm), when any relevant external reference

signal, including the received signal at the input port, is within its stated tolerance.

Test: The test shall be conducted according to subclause A.2.3.
4.2.1.4 Output jitter

Justification: A high level of jitter causes error reports within some networks, therefore this requirement

is included to prevent harm to the network (article 4d).

Requirement: The peak-to-peak output jitter shall not exceed the limits of table 2 when measured with a

band pass filter with the defined cut-off frequencies. At frequencies below the lower 3 dB point, the

attenuation of the high pass filter shall rise with a value greater than, or equal to, 20 dB per decade. At

frequencies above the upper 3 dB point, the attenuation of the low pass filtration shall rise with a value

greater than, or equal to, 60 dB per decade.
For the purpose of testing, any signal input from
...

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