ETSI ETS 300 176-2 ed.2 (1996-11)

Digital Enhanced Cordless Telecommunications (DECT); Approval test specification; Part 2: Speech

RE/RES-03028-2

Digitalne izboljšane brezvrvične telekomunikacije (DECT) - Specifikacija odobritvenega preskusa - 2. del: Govor

General Information

• Status: Published
• Publication Date: 03-Nov-1996
• Technical Committee: RES 3 - DECT
• Current Stage: 12 - Completion
• Due Date: 15-Nov-1996
• Completion Date: 04-Nov-1996
• Ref Project: SIST ETS 300 176-2:1999 - Digital Enhanced Cordless Telecommunications (DECT); Approval test specification; Part 2: Speech

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-1999
'LJLWDOQHL]EROMãDQHEUH]YUYLþQHWHOHNRPXQLNDFLMH'(&76SHFLILNDFLMD
RGREULWYHQHJDSUHVNXVDGHO*RYRU
Digital Enhanced Cordless Telecommunications (DECT); Approval test specification;
Part 2: Speech
Ta slovenski standard je istoveten z: ETS 300 176-2 Edition 2
ICS:
33.070.30 'LJLWDOQHL]EROMãDQH Digital Enhanced Cordless
EUH]YUYLþQHWHOHNRPXQLNDFLMH Telecommunications (DECT)
'(&7
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN ETS 300 176-2
TELECOMMUNICATION November 1996
STANDARD Second Edition
Source: ETSI TC-RES Reference: RE/RES-03028-2
ICS: 33.020, 33.060.50
Key words: DECT, radio, speech, testing, type approval
Radio Equipment and Systems (RES);
Digital Enhanced Cordless Telecommunications (DECT);
Approval test specification;
Part 2: Speech
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: [e-mail]
Tel.: [phone] - Fax: [phone]
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 1996. All rights reserved.

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ETS 300 176-2: November 1996
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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ETS 300 176-2: November 1996
Contents
Foreword .7
1 Scope .9
2 Normative references.10
3 Definitions and abbreviations .12
3.1 Definitions .12
3.2 Abbreviations .14
4 Interpretation of the measurement results .15
5 General test requirements.15
5.1 Test philosophy.15
5.1.1 Equipment supporting an ETSI approved profile.15
5.1.2 Equipment not supporting an ETSI approved profile.16
5.1.3 Applicant's declaration.16
5.2 Low noise room.17
5.3 Lower Tester (LT) .17
5.3.1 Description .17
5.3.2 Connections between the EUT and the LT .17
5.3.3 Functions and abilities.17
5.3.4 Measurement uncertainty.17
6 General testing conditions.18
6.1 Environment for tests.18
6.2 Power supply limitations .18
6.3 Power source.18
7 Speech and telephony tests .18
7.1 Test configurations .18
7.1.1 General.18
7.1.2 Testing a DECT system .18
7.1.3 Testing a separate PP or FP.19
7.1.4 Reference FP (ReFP) and Reference PP (RePP) .20
7.1.5 Applicability of tests.21
7.2 Digital signal level .21
7.3 General conditions of test .22
7.4 Ideal codec.22
7.5 Electro-acoustical equipment.23
7.6 Speech coding scheme .23
7.6.1 Requirement for speech coding algorithm .23
7.6.2 Applicant's declaration on speech coding algorithm .23
7.6.3 Requirement for the TAP in the FP .23
7.6.4 Applicant's declaration on the TAP in the FP .23
7.7 PP sending frequency response.24
7.7.1 Requirement.24
7.7.2 Method of measurement .24
7.8 PP receiving frequency response .24
7.8.1 Requirement.24
7.8.2 Method of measurement .25
7.9 PP loudness rating.25
7.9.1 Requirement.25
7.9.2 Method of measurement .25
7.9.2.1 SLR .25
H
7.9.2.2 RLR .25
H
7.10 User controlled volume control in the PP.25

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ETS 300 176-2: November 1996
7.10.1 Requirement . 25
7.10.2 Method of measurement. 26
7.10.2.1 SLR . 26
H
7.10.2.2 RLR . 26
H
7.11 PP talker sidetone masking rating. 26
7.11.1 Requirement . 26
7.11.2 Method of measurement. 26
7.12 Listener SideTone (LST) . 27
7.12.1 LSTR requirement . 27
7.12.2 Protocol requirement for EUTs with declared noise rejection capability. 27
7.12.3 Method of measurement for LSTR . 27
7.12.4 Method of measurement for the protocol requirement for EUTs with
declared noise rejection capability applying to be approved separately . 28
7.12.5 Applicant's declaration for the protocol requirement for EUTs applying to
be approved as a DECT system. 28
7.13 Terminal Coupling Loss (TCLw) of a PP. 28
7.13.1 TCLw requirement . 28
7.13.2 Protocol requirement . 28
7.13.3 Method of measurement for TCLw for a PP being approved separately. 28
7.13.4 Method of measurement for TCLw for a PP being approved as part of a
DECT system. 29
7.13.5 Method of measurement for the protocol requirement for EUTs applying
to be approved separately . 29
7.13.6 Applicant's declaration for the protocol requirement for EUTs applying to
be approved as a DECT system. 29
7.14 FP echo control functions with a 4-wire interface. 30
7.14.1 Static requirements. 30
7.14.2 Dynamic requirements. 30
7.14.2.1 Minimum TCLw. 30
7.14.2.2 Full TCLw. 30
7.14.3 Artificial echo loss of a FP with a 4-wire interface . 30
7.14.3.1 Requirement for artificial echo loss. 30
7.14.3.2 Requirement for the ability to disable the artificial echo
loss. 31
7.14.3.3 Method of measurement of artificial echo loss . 31
7.14.3.4 Method of measurement for ability to disable artificial
echo loss. 31
7.14.3.4.1 EUTs being approved as separate
items. 31
7.14.3.4.2 EUTs being approved as a DECT
system with a PP having full TCLw . 31
7.14.4 Echo control device of a FP with a 4-wire interface. 31
7.14.4.1 Requirement for the echo control device . 31
7.14.4.2 Requirement for the ability to disable the echo control
device. 31
7.14.4.3 Method of measurement for the echo control device. 32
7.14.4.4 Method of measurement for the ability to disable the echo
control function. 32
7.14.4.4.1 EUTs being approved as separate
items. 32
7.14.4.4.2 EUTs being approved as a DECT
system with a PP having full TCLw . 32
7.15 Stability loss - fixed geometry. 32
7.15.1 Requirement . 32
7.15.2 Method of measurement. 32
7.16 Stability loss variable geometry. 33
7.16.1 Requirement . 33
7.16.2 Method of measurement. 33
7.17 Sending distortion. 33
7.17.1 Requirement . 33
7.17.2 Method of measurement. 33
7.18 Receiving distortion. 34
7.18.1 Requirement . 34

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ETS 300 176-2: November 1996
7.18.2 Method of measurement .34
7.19 Side tone distortion .34
7.19.1 Requirement.34
7.19.2 Method of measurement .34
7.20 Out of band (sending) .34
7.20.1 Requirement.34
7.20.2 Method of measurement .34
7.21 Out of band (receiving) .35
7.21.1 Requirement.35
7.21.2 Method of measurement .35
7.22 Sending noise .35
7.22.1 Requirement.35
7.22.2 Method of measurement .35
7.23 Sending noise (narrow band).36
7.23.1 Requirement.36
7.23.2 Method of measurement .36
7.24 Receiving noise.36
7.24.1 Requirement.36
7.24.2 Method of measurement .36
7.25 Sampling frequency level (receiving).36
7.25.1 Requirement.36
7.25.2 Method of measurement .36
7.26 Acoustic shock.36
7.27 DECT network delay.37
7.27.1 Requirement.37
7.27.2 Method of measurement .37
7.28 PP delay.38
7.28.1 Requirement.38
7.28.2 Method of measurement .38
7.29 FP delay.40
7.29.1 Requirement.40
7.29.2 Method of measurement .40
7.30 Echo control at the network side.41
7.30.1 Requirement.41
7.30.2 Method of measurement .41
7.30.2.1 4-wire interface .42
7.30.2.2 Analogue 2-wire interface.42
7.30.2.2.1 Requirement 1 .42
7.30.2.2.2 Requirement 2 .43
7.31 Variation of gain with input level-sending.44
7.31.1 Requirement.44
7.31.2 Method of measurement .44
7.32 Variation of gain with input level- receiving.45
7.32.1 Requirement.45
7.32.2 Method of measurement .45
8 Loudspeaking and handsfree telephony .45
Annex A (informative): Essential requirement justification.46
Annex B (informative): Description of the CSS .47
B.1 General.47
B.2 Test signal.47
B.3 Measurement .48
B.4 Calculation.49
Annex C (normative): Description of the cross-correlation method.51
C.1 Test signal.51

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ETS 300 176-2: November 1996
C.2 Calculation . 51
Annex D (informative): Acoustic shock requirements. 52
D.1 Continuous signal . 52
D.2 Peak signal . 52
Annex E (informative): Bibliography . 53
History. 54

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ETS 300 176-2: November 1996
Foreword
This 2nd edition European Telecommunication Standard (ETS) has been produced by the Radio
Equipment and Systems (RES) Technical Committee of the European Telecommunications Standards
Institute (ETSI).
This ETS contains text pertaining to approval testing of the Digital Enhanced Cordless
Telecommunications (DECT) Common Interface. Such text should be considered as guidance to approval
(or licensing) authorities.
Details of the DECT Common Interface may be found in ETS 300 175, parts 1 to 9 [1] to [9]. Further
details of the DECT system may be found in ETR 015, ETR 043, and ETR 056 (see annex E).
This ETS consists of 2 parts as follows:
Part 1: "Radio";
Part 2: "Speech".
Transposition dates
Date of adoption of this ETS: 25 October 1996
Date of latest announcement of this ETS (doa): 28 February 1997
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 August 1997
Date of withdrawal of any conflicting National Standard (dow): 31 August 1997

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ETS 300 176-2: November 1996
Blank page
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ETS 300 176-2: November 1996
1 Scope
This European Telecommunications Standard (ETS) specifies the approval tests applicable to all Digital
Enhanced Cordless Telecommunications (DECT) equipment accessing the DECT frequency band
1 880 MHz to 1 900 MHz (including provisions for testing other or extended frequency bands) and the
approval tests applicable to DECT speech transmission using CCITT Recommendation G.726 [23]
ADPCM speech codec at 32 kbit/s.
The aims of this ETS are to ensure:
- efficient use of frequency spectrum;
- no harm done to any connected network and its services;
- no harm done to other radio networks and services;
- no harm done to other DECT equipment or its services;
- interworking of terminal equipment via the public telecommunications network,
through testing those provisions of ETS 300 175, parts 1 to 9 [1] to [9] which are relevant to these aims.
The tests of this ETS split into two parts:
- part 1 covers testing of radio frequency parameters, security elements and those DECT protocols
that facilitate the radio frequency tests and efficient use of frequency spectrum;
- this part describes testing of DECT 32 kbit/s ADPCM speech requirements between network
interface and DECT PT, or between a DECT CI air interface and alternatively a DECT PT or FT.
This part is not applicable to terminal equipment specially designed for the disabled (e.g. with
amplification of received speech as an aid for the hard of hearing).
DECT comprises two equipment elements, referred to as a Fixed Part (FP) and a Portable Part (PP). This
part is structured to allow type approval of either:
a) the FP and PP together; or
b) the FP and PP as separate items.
Where the DECT FP is connected to a PSTN, and there are any national peculiarities in the requirements
for voice telephony, these shall be accommodated within the FP.
NOTE: The contents of this ETS may be amended according to changes to the associated
regulatory requirements.
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ETS 300 176-2: November 1996
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 300 175-1: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 1:
Overview".
[2] ETS 300 175-2: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 2: Physical
Layer".
[3] ETS 300 175-3: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 3: Medium
Access Control (MAC) layer".
[4] ETS 300 175-4: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 4: Data
Link Control (DLC) layer".
[5] ETS 300 175-5: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 5: Network
(NWK) layer".
[6] ETS 300 175-6: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 6:
Identities and addressing".
[7] ETS 300 175-7: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 7: Security
features".
[8] ETS 300 175-8: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 8: Speech
coding and transmission".
[9] ETS 300 175-9: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Common Interface (CI); Part 9: Public
Access Profile (PAP)".
[10] ETS 300 001 (1992): "Attachments to Public Switched Telephone Network
(PSTN); General technical requirements for equipment connected to an
analogue subscriber interface in the PSTN (NET 4)".
[11] ETS 300 111: "Integrated Services Digital Network (ISDN); Telephony 3,1 kHz
teleservice; Service description".
[12] ETS 300 444: "Radio Equipment and Systems (RES); Digital European
Cordless Telecommunications (DECT); Generic Access Profile (GAP)".
[13] TBR 3: "Integrated Services Digital Network (ISDN); Attachment requirements
for terminal equipment to connect to an ISDN using ISDN basic access."
[14] TBR 8 (1994): "Integrated Services Digital Network (ISDN); Telephony 3,1 kHz
teleservice; Attachment requirements for handset terminals".

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ETS 300 176-2: November 1996
[15] 73/23/EEC: "Council Directive of 19 February 1973 on the harmonization of the
laws of the Member States relating to electrical equipment designed for use
within certain voltage limits." (Low Voltage Directive).
[16] 91/263/EEC: "Council Directive of 29 April 1991 on the approximation of the
laws of the Member States concerning telecommunications terminal equipment,
including the mutual recognition of their conformity" (Terminal Directive).
[17] CCITT Recommendation G.101 (1988): "The transmission plan".
[18] ITU-T Recommendation G.111: "Loudness ratings (LRs) in an international
connection".
[19] CCITT Recommendation G.122 (1988): "Influence of national systems on
stability talker echo in international connections".
[20] CCITT Recommendation G.223 (1988): "Assumptions for the calculation of
noise on hypothetical reference circuits for telephony".
[21] CCITT Recommendation G.711 (1988): "Pulse code modulation (PCM) of voice
frequencies".
[22] CCITT Recommendation G.712 (1992): "Transmission performance character-
istics of pulse code modulation".
[23] CCITT Recommendation G.726 (1991): "40, 32, 24, 16 kbit/s adaptive
differential pulse code modulation (ADPCM)".
[24] CCITT Recommendation O.132 (1988): "Quantizing distortion measuring
equipment using a sinusoidal test signal".
[25] CCITT Recommendation O.133 (1988): "Equipment for measuring the
performance of PCM encoders and decoders".
[26] ITU-T Recommendation P.50 (1993): "Artificial voices".
[27] ITU-T Recommendation P.51 (1993): "Artificial mouth".
[28] ITU-T Recommendation P.57 (1993): "Artificial ears".
[29] ITU-T Recommendation P.64 (1993): "Determination of sensitivity/frequency
characteristics of local telephone systems".
[30] ITU-T Recommendation P.79 (1993): "Calculation of loudness ratings for
telephone sets".
[31] IEC 651: "Sound level meters".
[32] ISO 3 (1973): "Preferred numbers - series of preferred numbers".
[33] ISO DIS 9614: "Acoustics - Determination of sound power levels of noise
sources using sound intensity".

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ETS 300 176-2: November 1996
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply:
Acoustic Reference Level (ARL): The acoustic level that corresponds to a power level of -10 dBm0 at
the TAP.
conducted measurements: Measurements which are made using a direct connection to the Equipment
Under Test (EUT).
dBPa: Sound pressure level relative to 1 Pa (no weighting).
duplex bearer: The use of two simplex bearers operating in opposite directions on two physical channels.
These pairs of channels always use the same radio Frequency (RF) carrier and always use evenly spaced
slots (i.e. separated by 0,5 Time Division Multiple Access (TDMA) frame).
Equipment Under Test (EUT): The equipment submitted to the test laboratory for type examination.
fixed geometry PP: A PP in which the electro-acoustic transducers and their associated acoustic
components are held in fixed relative positions and/or orientations during all on-line conditions of the PP.
Fixed Part (DECT Fixed Part) (FP): A physical grouping that contains all of the elements in the DECT
network between the local network and the DECT air interface.
NOTE 1: A DECT fixed part contains the logical elements of at least one fixed radio termination,
plus additional implementation specific elements.

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ETS 300 176-2: November 1996
Fixed Radio Termination (FT): A logical group of functions that contains all of the DECT processes and
procedures on the fixed side of the DECT air interface.
NOTE 2: A fixed radio termination only includes elements that are defined in ETS 300 175
parts 1 to 8 [1] to [8]. This includes radio transmission elements (layer 1) together with
a selection of layer 2 and layer 3 elements.
Full Slot (SLOT): One 24th of a TDMA frame which is used to support one physical channel.
handset echo: The echo, perceptible by the far-end user, resulting from the coupling between the receive
and send directions of the handset, mostly due to acoustic coupling between transducers. It is particularly
cumbersome in communications including a satellite and an echo canceller, as the DECT handset echo
may be out of range of the echo canceller.
inter-operability: The capability of fixed parts and portable parts, that enable a portable part to obtain
access to teleservices in more than one location area and/or from more than one operator (more than one
service provider).
Local Echo Loss (LLE): The sum of the reflections measured at the digital interface of the RePP. It is
calculated according to CCITT Recommendations G.122 [19], annex B4, Trapezoidal rule.
Lower Tester (LT): A logical grouping that contains the test equipment, a functionally equivalent DECT
PT, a functionally equivalent DECT FT and a test controller.
network echo: The echo, perceptible by the DECT user, resulting from reflections in the network. It is
mostly due to hybrid impairments at both ends of the communication. The protection consists of an
additional echo loss located in the receive path of the DECT system.
Public Access Profile (PAP): A defined part of the ETS 300 175-9 [9] that ensures inter-operability
between fixed parts and portable parts for public access services.
Portable Handset (PHS): A single physical grouping that contains all of the portable elements that are
needed to provide a teleservice to the user.
NOTE 3: Portable handset is a subset of all possible portable parts. This subset includes all
physical groupings that combine one portable radio termination plus at least one
portable application in a single physical box.
Portable Part (PP): A physical grouping that contains all elements between the user and the DECT air
interface. Portable Part (PP) is a generic term that may describe one or several physical pieces.
NOTE 4: A portable part is logically divided into one portable termination plus one or more
portable applications.
Portable Radio Termination (PT): A logical group of functions that contains all of the DECT processes
and procedures on the portable side of the DECT air interface.
NOTE 5: A PT only includes elements that are defined in ETS 300 175 parts 1 to 9 [1] to [9].
This includes radio transmission elements together with a selection of layer 2 and layer
3 elements.
public: An attribute indicating that the application of the so qualified term is used to provide access to a
public network for the general public.
NOTE 6: The term does not imply any legal or regulatory aspect, nor does it imply any aspects
of ownership.
Test Access Point (TAP): The Test Access Point is a digital interface with a relative level of 0 dBr
providing the access to the PCM speech channels in both transmission directions.

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ETS 300 176-2: November 1996
telephony 3,1 kHz teleservice: A definition for telephony 3,1 kHz teleservice is to be found in
ETS 300 111 [11].
NOTE 7: Work is currently being undertaken by ETSI to analyse the mouth-to-ear
characteristics of voice communication. The results of this work can have
consequences for the essential requirements of this ETS.
test laboratory: A body which performs testing and is designated to perform 3rd party testing.
variable geometry PP: A PP that allows the position and/or orientation of its electro-acoustic transducers
and their associated acoustic components to be changed during all on-line conditions of the PP.
3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ARL Acoustic Reference Level
BER Bit Error Ratio
CLRR Circuit Loudness Rating, Receive
CLRS Circuit Loudness Rating, Send
CSS Composite Source Signal
dBm dB relative to 1 mW
dBm0 The absolute power level in decibels referred to a point of zero relative level
dBr The relative power level in decibels
ERP Ear Reference Point
EUT Equipment Under Test
FFT Fast Fourier Transformation
FP Fixed Part
FT Fixed radio Termination
GAP Generic Access Profile
LE Local Echo
LNR Low Noise Room
L Telephone Sidetone Path Loss
meST
LL Local Echo loss
e
LR Loudness Rating
LRGP Loudness Rating Guard-ring Position
LST Listener Sidetone
LSTR Listener Sidetone Rating
LT Lower Tester
MRP Mouth Reference Point
PABX Private Automatic Branch Exchange
PP Portable Part
PT Portable radio Termination
ReFP Reference Fixed Part (for speech testing)
RePP Reference Portable Part (for speech testing)
RF Radio Frequency
Receiving Loudness Rating of the Handset
RLR
H
rms root mean square
SLR Sending Loudness Rating of the Handset
H
SL Linear input Signal, see CCITT Recommendation G.726 [23]
SR Reconstructed Signal, see CCITT Recommendation G.726 [23]
Ssi(diff) The difference of the send sensitivities between diffuse and direct sound
Ssi(direct) The sending sensitivities for the direct sound
STMR SideTone Masking Rating
TAP Test Access Point
TCL Terminal Coupling Loss
TCLw weighted Terminal Coupling Loss
TDMA Time Division Multiple Access
TELR Talker Echo Loudness Rating

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ETS 300 176-2: November 1996
4 Interpretation of the measurement results
The interpretation of the results recorded in a test report for the measurements described in this ETS shall
be as follows:
a) the measured value related to the corresponding limit shall be used to decide whether an
equipment meets the minimum requirements of the standard;
b) the actual measurement uncertainty of the test laboratory carrying out the measurement, for each
particular measurement, shall be included in the test report;
c) the values of the actual measurement uncertainty shall be, for each measurement, equal to or lower
than the values in subclause 5.3.4.
5 General test requirements
Where the DECT FP is connected to a PSTN, and there are any national peculiarities in the requirements
for voice telephony, these shall be accommodated within the FP, and the national authorities need to
recognize that deviations of parameters which are justified by the basic principles of the DECT standard
shall be approved (see ETS 300 001 [10]).
Those functions and procedures which are optional, as indicated directly or indirectly by "if provided", shall
be subject to a conformance test if they are implemented. Whether an optional function/procedure has
been implemented shall be indicated by the Apparatus Suppliers declaration.
5.1 Test philosophy
5.1.1 Equipment supporting an ETSI approved profile
Equipment falling into this category is defined in ETS 300 175-1 [1].
In this case, a test equipment capable of emulating a PT or FT that conforms to ETS 300 175 parts 1 to
9 [1] to [9] operating an ETSI approved profile (e.g. Public Access Profile, (PAP)) corresponding to that
supported by the EUT is required. Consequently, each test set-up consists of the test equipment being
connected to the EUT, either by a radio link or via an antenna connector, and a call being established.
Figures 1 and 2 show the possible test configurations.
Upp er tester Low er tester
PT
em u latin g
EU T
a FT
R adio link
OR
cable connection
Low er tester
Upp er tester
PT em ulating
EU T a FT
Figure 1: The EUT is a PT
Page 16
ETS 300 176-2: November 1996
Low er tester
Upp er tester
FT
em u latin g
EU T
a PT
R adio link
OR
cable connection
Upp er tester Low er tester
FT em ulating
EU T a PT
Figure 2: The EUT is an FT
Figures 1 and 2 also show that, if available, the EUT can sometimes be connected to the LT by an
antenna connector. This is normally preferred in order to minimize the measurement uncertainties.
The Lower Tester (LT) will consist of the general test equipment with the functionality as described in
subclause 5.3. Also it will include an RF interface which can emulate the DECT Common Interface.
5.1.2 Equipment not supporting an ETSI approved profile
Equipment falling into this category is defined in ETS 300 175-1 [1].
If an LT is available that can establish a speech connection with the EUT and the EUT supports, where
required, the <> information element as described in ETS 300 175-5 [5]
subclause 7.7.41, then approval of an FP and a PP as a separate item is allowed, and the test philosophy
described in subclause 5.1.1 shall be applicable.
If an LT is not available that can establish a speech connection with the EUT or the EUT does not support,
where required, the <> information element as described in ETS 300 175-5 [5]
subclause 7.7.41, then the FP and PP shall be approved as a pair. The applicant shall describe to the test
authority how a call is established, maintained and released.
However, when a PT or FT is to be tested as a separate item, the applicant shall provide the test authority
with a means for establishing, maintaining and releasing a speech connection in order to test the EUT.
5.1.3 Applicant's declaration
Where parameters, capabilities, etc. are subject to applicant's declaration and not a specific test, it will be
the applicant's responsibility to:
a) supply a Declaration of Implementation, in which the Applicant explicitly affirms the implementation
in the equipment of certain parameters and capabilities;
b) be prepared to submit upon request supporting design information, including circuit designs and
software source code, demonstrating the implementation of said capabilities;
c) be prepared to supply upon request such test results as are practicable, including the test methods,
which support the declaration.
NOTE: This applies also where adaptive volume control methods are provided for noise
rejection and/or echo control capabilities which e.g. have to be switched inactive for
some of the tests described below and/or where new test methods have to be
declared.
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ETS 300 176-2: November 1996
5.2 Low noise room
Low noise refers to audio sound and not RF radiation.
The test space shall be practically free-field (anechoic) down to a lowest frequency of 275 Hz, and be
such that the handset lies totally within the free field volume. This shall be met if deviations from the ideal
free field conditions are less than ±1 dB. The ambient noise level shall be less than -64 dBPa(A).
Measurements made in the low noise room shall satisfy the measurement uncertainty requirements
described in subclause 5.3.4.
5.3 Lower Tester (LT)
5.3.1 Description
The LT is a logical grouping that contains a ReFP, RePP, the measurement equipment and the controller
of the DECT testing system. The LT has the job of establishing the speech path, performing calculations
(e.g. signal processing) and interacting with the EUT for the various tests. The LT shall implement the
mandatory parts of the DECT specification (see part A of this ETS) and any ETSI approved profiles (e.g.
PAP).
When testing EUTs that do not support an ETSI approved profile, the LT is not required to have
implemented an ETSI approved profile. See subclause 5.1.2.
5.3.2 Connections between the EUT and the LT
This is specified in each test case.
5.3.3 Functions and abilities
The LT shall include all the functions necessary to perform the tests and measurements as described in
this ETS according to the measurement uncertainties described in subclause 5.3.4.
5.3.4 Measurement uncertainty
The following values of measurement uncertainty (or better) associated with each measurement
parameter apply to all of the test cases described in this ETS:
electrical signal power: ±0,2 dB for levels ≥ -50 dBm;
electrical signal power: ±0,4 dB for levels < -50 dBm;
sound pressure: ±0,7 dB;
time: ±5 %;
frequency: ±2 %.
NOTE: When measuring sampled systems, it is advisable to avoid measuring at multiples of
the sampling frequency. A tolerance of ±2 % of the frequencies, may be used to avoid
this problem, except at 4 kHz where only the -2 % tolerance may be used.
The measurement uncertainty is defined as the combined effects of all sources of errors at a confidence
level of at least 95 %.
Page 18
ETS 300 176-2: November 1996
6 General testing conditions
6.1 Environment for tests
The following conditions shall apply during all tests:
- ambient temperature: +15°C to +35°C;
- atmospheric pressure: 86 to 106 kPa;
- Relative H
...