Business TeleCommunications (BTC); 140 Mbit/s digital unstructured and structured leased lines (D140U and D140S); 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 140 Mbit/s ter za nestrukturirane in strukturirane signale (D140U in D140S) - 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
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SLOVENSKI STANDARD
SIST TBR 025 E1:2004
01-oktober-2004
3RVORYQHWHOHNRPXQLNDFLMH %7& 'LJLWDOQL]DNXSOMHQLYRGL]DSUHQRVQRKLWURVW
0ELWVWHU]DQHVWUXNWXULUDQHLQVWUXNWXULUDQHVLJQDOH '8LQ'6 
3ULNOMXþLWYHQH]DKWHYH]DYPHVQLNWHUPLQDOVNHRSUHPH

Business TeleCommunications (BTC); 140 Mbit/s digital unstructured and structured

leased lines (D140U and D140S); Attachment requirements for terminal equipment
interface
Ta slovenski standard je istoveten z: TBR 025 Edition 1
ICS:
33.040.50 Vodi, zveze in tokokrogi Lines, connections and
circuits
SIST TBR 025 E1:2004 en

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

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SIST TBR 025 E1:2004
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SIST TBR 025 E1:2004
TECHNICAL TBR 25
BASIS for July 1997
REGULATION
Source: ETSI TC-BTC Reference: DTBR/BTC-02060
ICS: 33.040.40

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

Business TeleCommunications (BTC);
140 Mbit/s digital unstructured and structured leased lines
(D140U and D140S);
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 25: 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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TBR 25: 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 .......................................................................12

4.2.1.4 Output jitter ..........................................................................13

4.2.1.5 Output frame structure.........................................................14

4.2.2 Input port .......................................................................................................14

4.3 Safety.................................................................................................................................15

4.4 Overvoltage protection.......................................................................................................15

4.5 ElectroMagnetic Compatibility (EMC) ................................................................................15

Annex A (normative): Test methods......................................................................................................16

A.1 General..............................................................................................................................................16

A.1.1 Equipment connection .......................................................................................................16

A.1.2 Test environment ...............................................................................................................16

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

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

A.2.2 Waveform shape at the output port ...................................................................................17

A.2.3 Output timing......................................................................................................................18

A.2.4 Output jitter ........................................................................................................................19

A.2.5 Frame structure .................................................................................................................20

Annex B (normative): Definition of CMI code ........................................................................................21

B.1 General..............................................................................................................................................21

B.2 Definition ...........................................................................................................................................21

Annex C (normative): Definition of frame structure ...............................................................................22

C.1 Frame structure at 139 264 kbit/s .....................................................................................................22

Annex D (normative): TBR Requirements Table (TBR-RT) ..................................................................23

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

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

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TBR 25: July 1997
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TBR 25: 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 140 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 300 690.

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

interface.
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TBR 25: 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 139 264 kbit/s digital unstructured leased

lines (D140U); and

- connection to the NTPs of 139 264 kbit/s digital structured leased lines (D140S) with an information

transfer rate of 138 240 kbit/s without restriction on binary content.
These leased lines are defined in ETS 300 686 and ETS 300 688.

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 D140U or D140S 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 D140U leased lines which do not

comply with the specified requirements on output structure, do not satisfy the attachment requirements for

connection to the D140S structured 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 25: 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
BNC Bayonet Nut Connector
CMI Coded Mark Inversion
D140S 140 Mbit/s digital structured leased line
D140U 140 Mbit/s digital unstructured leased line
dc direct current
EMC ElectroMagnetic Compatibility
FA1 Frame Alignment byte 1
FA2 Frame Alignment byte 2
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 25: July 1997
4 Requirements
The terminal equipment is for use with D140U or D140S leased lines.

The D140U 139 264 kbit/s unstructured leased line provides a bi-directional point-to-point digital

connection with an information transfer rate of 139 264 kbit/s without restriction on binary content. Any

structuring of the data is the responsibility of the user.

The D140S 139 264 kbit/s structured leased line provides a bi-directional point-to-point digital connection

with an information transfer rate of 138 240 kbit/s without restriction on binary content. Any structuring of

the data within the transparent 138 240 kbit/s part of the frame is the responsibility of the user.

For both D140U and D140S 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 300 690 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; IEC 9-1 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 IEC 9-1.

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.
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TBR 25: July 1997
OUTPUT INPUT
TX RX
TERMINAL
NETWORK
EQUIPMENT
INTERFACE
INTERFACE
RX TX
INPUT OUTPUT
Figure 1
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 Coded Mark Inversion (CMI)

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 figures 2 and 3

and table 1; based on ITU-T Recommendation G.703.
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TBR 25: July 1997
T = 7,18 ns
0,60
(see note 1) (see note 1)
0,55
0,50
1 ns
1,795 ns 1,795 ns
0,45
Nominal
1 ns 1 ns
0,40 pulse
0,1 ns
0,1 ns
0,35 ns 0,1 ns
0,1 ns
0,35 ns
0,05
Nominal
zero level
-0,05
1 ns 1 ns
1 ns
-0,40
1,795 ns 1,795 ns
-0,45
-0,50
-0,55 (see note 1)
(see note 1)
-0,60
Negative
transitions Positive transition
at mid-unit interval

NOTE 1: The maximum "steady state" amplitude shall not exceed the 0,55 V limit. Overshoots and other

transients are permitted to fall into the dotted area, bounded by the amplitude levels 0,55 V and

0,60 V, provided they do not exceed the steady state level by more than 0,05 V.

NOTE 2: The rise time and decay time shall be measured between -0,4 V and 0,4 V and shall not

exceed 2 ns.
Figure 2: Mask of a pulse corresponding to a binary 0
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TBR 25: July 1997
T = 7,18 ns
0,60
(see note 1)
(see note 1)
0,55
0,50
1 ns
0,45
1 ns
0,40
0,1 ns 0,1 ns
0,5 ns 0,5 ns
0,05
Nominal
zero level
-0,05
3,59 ns 3,59 ns
1,35 ns 1,35 ns
1 ns 1 ns
-0,40
1,795 ns 1,795 ns
-0,45
-0,50
-0,55
(see note 1)
-0,60
Negative
Positive
transition
transition

NOTE 1: The maximum "steady state" amplitude shall not exceed the 0,55 V limit. Overshoots and other

transients are permitted to fall into the dotted area, bounded by the amplitude levels 0,55 V and

0,60 V, provided they do not exceed the steady state level by more than 0,05 V.

NOTE 2: The inverse pulse shall have the same characteristics, noting that the timing tolerance at the

level of the negative and positive transitions are ± 0,1 ns and ± 0,5 ns respectively.

NOTE 3: The rise time and decay time shall be measured between -0,4 V and 0,4 V and shall not

exceed 2 ns.
Figure 3: Mask of a pulse corresponding to a binary 1
Table 1: Waveform shape at output port
Pulse shape Nominally rectangular and conforming with the masks shown
in figures 2 and 3.
Test load impedance 75 Ω non-reactive
Peak to peak voltage 1,0 ± 0,1 V
Rise time between 10 %and ≤ 2 ns
90 %amplitudes of the measured steady
state amplitude
Transition timing tolerance (referred to Negative transitions: ± 0,1 ns

the mean value of the 50 %amplitude Positive transitions at unit interval boundaries: ± 0,5 ns

points of the negative transition) Positive transitions at mid-interval: ± 0,35 ns

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).
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TBR 25: July 1997
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 139 264 kbit/s ± 15 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 which the output timing is derived shall be provided with

the maximum tolerable input jitter, and with the maximum tolerable input frequency deviation, as specified

by the manufacturer.

Where the output timing of the terminal equipment is taken from the leased line, the input to the terminal

equipment shall be provided with components of sinusoidal jitter at points on the curve of figure 4 and

table 3.
Table 2: Maximum output jitter
Measurement filter bandwidth Output jitter
Lower cut-off Upper cut-off Unit Interval (UI) peak-
(high pass) (low pass) to-peak (maximum)
200 Hz 3 500 kHz 0,4
10 kHz 3 500 kHz 0,075
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TBR 25: July 1997
peak-to-peak jitter
f1 f2 f3 f4
jitter frequency
Figure 4: Input jitter tolerance
Table 3: Input jitter tolerance
Peak-to-peak amplitude (UI) Frequency
A1 A2 f1 f2 f3 f4
1,5 0,075 200 Hz 500 Hz 10 kHz 3 500 kHz
Test: The test shall be conducted according to subclause A.2.6.
4.2.1.5 Output frame structure

Justification: If the input bit stream to the structured leased line does not have the correct Frame

Alignment bytes 1 (FA1) and Frame Alignment bytes 2 (FA2), the leased line will not be able to achieve

frame alignment for the purposes of monitoring the line and may cause error reports. Therefore a

requirement on the frame alignment signals is included to prevent harm to the network (article 4d).

Requirement: For terminal equipments intended for connection to the D140S structured leased line,

the bit stream transmitted at the output of the terminal equipment shall be structured as defined in

annex C.
Test: The test shall be conducted according to subclause A.2.5.
4.2.2 Input port

There are no requirements on the input port under this TBR, except as specified in subclause 4.1.

Justification: The requirements imposed on the terminal equipment output port do not require the correct

receipt of data at the terminal equipment input port. The network output port should be protected against

both short circuit and open circuit. Therefore there are no requirements within the base standard

ETS 300 690 that can be considered as essential requirements.
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TBR 25: July 1997
4.3 Safety
There are no safety requirements under this TBR.

NOTE: Safety requirements are imposed under the Low Voltage Directive (73/23/EEC) and

articles 4a and 4b of the Second Phase Directive (91/263/EEC). ETS 300 690
subclause 4.3 defines the terminal equipment interface as an Safety Extra-Low

Voltage (SELV) circuit. Detailed requirements for SELV circuits are given in EN 60950.

4.4 Overvoltage protection
There are no overvoltage protection requirements under this TBR.

NOTE: Requirements for overvoltage protection requirements on a 75 Ω interface are under

study. Requirements may be added to this TBR when appropriate specifications
become available.
4.5 ElectroMagnetic Compatibility (EMC)
There are no EMC requirements under this TBR.
NOTE: General EMC requirements are imposed under the EMC Directive (89/336/EEC).
Requirements for conducted emissions will be added to this TBR when appropriate

specifications become available if these requirements are not imposed under the EMC

Directive.
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TBR 25: July 1997
Annex A (normative): Test methods
A.1 General

This annex describes the test principles to determine the compliance of a terminal equipment against the

requirements of this TBR.

It is outside the scope of this TBR to identify the specific details of the implementation of the tests.

A terminal equipment may be designed for through-connecting and may fulfil the electrical requirements

only if through-connected. In these cases the requirements of this TBR are valid and the tests are carried

out with the through-connection terminated as specified by the equipment supplier.

Details of test equipment accuracy and the specification tolerance of the test devices are not included in

all cases. Where such details are provided they shall be complied with, but the way they are expressed

shall not constrain the method of implementing the test.

NOTE: Attention is drawn to the issue of measurement uncertainty which may be addressed in

future documents. Not all the required test results make allowance for spurious events

during testing (e.g. errors due to EMC effects), which may make it necessary to repeat

a test.

The given test configurations do not imply a specific realization of the test equipment or test arrangement,

or the use of specific test devices. However any test configuration used shall provide those test conditions

specified under "interface state", "stimulus" and "monitor" for each individual test.

The test equipment shall be a device, or a group of devices, generating a stimulus signal conforming to

this annex and capable of monitoring the signal received from the interface.

The terminal equipment interface under test shall have the ability to transmit a bit pattern for test

23-1

purposes, e.g. a Pseudo Random Bit Sequence (PRBS(2 )) as defined in subclause 2.2 of ITU-T

Recommendation O.151 [2]. Where this cannot be provided, an alternative method of conducting the test

shall be provided.
A.1.1 Equipment connection

The tests shall be applied at the sockets or plugs supplied with the terminal equipment for connection to

the leased line interface. Connecting cable between the sockets and test equipment shall be kept to a

minimum, except where cable is specified as part of the test.

Where plugs are provided at the end of a cord, the tests specified in subclause A.2.2 may be performed at

the point of connection of the cord to the terminal equipment, since the requirements are based on ITU-T

Recommendation G.703 which makes no allowance for any plug and cord.
A.1.2 Test environment
All tests shall be performed at:
- an ambient temperature in the range +19 C to +25 C;
- a relative humidity in the range 5 % to 75 %.

For terminal equipment which is not designed to operate within the environmental range specified above,

all tests shall be performed in an environmental condition as specified by the supplier.

For terminal equipment which is directly powered (either wholly or partly) from the mains supply, all tests

shall be carried out with ± 5 % of the rated voltage of that supply. If the equipment is powered by other

means and those means are not suppl
...

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