ETSI ETS 300 002 ed.2 (1996-05)

Public Switched Telephone Network (PSTN); Category II specification for 9 600 or 4 800 bits per second duplex modems standardized for use on the PSTN

RE/TE-05044

Javno komutirano telefonsko omrežje (PSTN) – Priključitvene zahteve kategorije II za dupleksne modeme za hitrosti 9600 b/s ali 4800 b/s, standardizirane za uporabo v PSTN

General Information

• Status: Published
• Publication Date: 30-May-1996
• Technical Committee: TE 5 - General Terminal Access Requirements
• Current Stage: 12 - Completion
• Due Date: 21-May-1996
• Completion Date: 31-May-1996
• Ref Project: SIST ETS 300 002 E2:2003 - Public Switched Telephone Network (PSTN); Category II specification for 9 600 or 4 800 bits per second duplex modems standardized for use on the PSTN

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 002 E2:2003
01-december-2003
-DYQRNRPXWLUDQRWHOHIRQVNRRPUHåMH3671±3ULNOMXþLWYHQH]DKWHYHNDWHJRULMH,,
]DGXSOHNVQHPRGHPH]DKLWURVWLEVDOLEVVWDQGDUGL]LUDQH]DXSRUDER
Y3671
Public Switched Telephone Network (PSTN); Category II specification for 9 600 or 4 800
bits per second duplex modems standardized for use on the PSTN
Ta slovenski standard je istoveten z: ETS 300 002 Edition 2
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 002 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 002 E2:2003

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SIST ETS 300 002 E2:2003
EUROPEAN ETS 300 002
TELECOMMUNICATION May 1996
STANDARD Second Edition
Source: ETSI TC-TE Reference: RE/TE-05044
ICS: 33.020
PSTN, modems, access, analogue
Key words:
Public Switched Telephone Network (PSTN);
Category II specification for 9 600 or 4 800 bits per
second duplex modems standardized for use on the PSTN
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - [e-mail]
X.400: Internet:
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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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword .7
1 Scope .9
2 Normative references.9
3 Definitions and abbreviations .10
3.1 Definitions .10
3.2 Abbreviations .10
4 General requirements .10
4.1 References to other ETSs .10
4.2 Information to be provided by the applicant.11
4.2.1 Information required for testing purposes .11
4.2.2 Instructions for use.11
5 Functional requirements specific to Category II modems .11
5.1 General requirements .11
5.2 Modes of operation/use .12
5.3 Line signals.12
5.3.1 Transmitted carrier frequency .12
5.3.2 Receiver carrier tolerance .13
5.3.3 Transmitted spectrum .13
5.4 Line signalling rates .13
5.5 Encoding of data.13
5.6 Scrambler and descrambler.13
5.7 Channel allocation .13
5.7.1 Channel selection.13
5.7.2 Automatic channel selection.14
5.8 Hand-shaking sequences .14
5.8.1 Definitions.14
5.8.2 Calling and answering procedures .15
5.8.2.1 Calling tone.15
5.8.2.2 Answer tone recognition .16
5.8.2.3 Answer tone generation.16
5.8.3 Start-up procedure .16
5.8.3.1 Call Mode Modem (CMM) .16
5.8.3.1.1 Initiation of the start-up procedure .16
5.8.3.1.2 Round trip delay determination.16
5.8.3.1.3 Rate negotiation.17
5.8.3.1.4 Completion of the rate negotiation.17
5.8.3.1.5 Completion of the hand-shake.17
5.8.3.2 Answer Mode Modem (AMM).18
5.8.3.2.1 Initiation of the start-up procedure .18
5.8.3.2.2 Round trip delay determination.18
5.8.3.2.3 Rate negotiation.18
5.8.3.2.4 Completion of rate negotiation.19
5.8.3.2.5 Completion of the hand-shake.19
5.8.4 Retrain sequence .19
5.8.4.1 Initiating signal .19
5.8.4.1.1 Call Mode Modem (CMM).20
5.8.4.1.2 Answer Mode Modem (AMM) .20
5.8.4.2 Response signal .20
5.8.4.2.1 Call Mode Modem (CMM).20
5.8.4.2.2 Answer Mode Modem (AMM) .20
5.9 Transmission of start-stop characters .20
5.10 Threshold of received line signal detector .21

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5.11 Test loop 2. 21
5.11.1 Definitions . 21
5.11.2 Instigation of a remote loop 2 . 21
5.11.3 Termination of a remote loop 2. 22
5.12 Receiver performance. 22
5.12.1 Normal case. 22
5.12.2 Case with satellite delay . 22
Annex A (normative): Testing methods . 24
A.1 General testing conditions . 24
A.1.1 General notes. 24
A.1.1.1 Test set-up. 24
A.1.1.2 Determination of signals . 24
A.1.2 Limitation of number of tests. 25
A.1.2.1 Introduction . 25
A.1.2.2 General rules . 25
A.1.2.3 Specific rules . 25
A.1.3 Proposed order for performing the tests . 26
A.2 Test for subclause 5.3.1 (Transmitted carrier frequency). 27
A.3 Test for subclause 5.3.2 (Receiver carrier tolerance) . 27
A.4 Test for subclause 5.4 (Line signalling rates). 27
A.5 Test for subclause 5.5 (Encoding of data). 27
A.6 Test for subclause 5.6 (scrambler and descrambler). 28
A.7 Test for subclause 5.7 (Channel allocation) . 28
A.8 Test for subclause 5.8 (Hand-shaking sequences). 28
A.8.1 Test for subclause 5.8.2 (Calling and answering procedures). 28
A.8.1.1 Test for subclause 5.8.2.1 (Calling tone). 28
A.8.1.2 Test for subclause 5.8.2.2 (Answer tone recognition) . 28
A.8.1.3 Test for subclause 5.8.2.3 (Answer tone generation). 28
A.8.2 Tests for subclause 5.8.3 (Start-up procedure) . 29
A.8.2.1 Tests for subclause 5.8.3.1 (CMM) . 29
A.8.2.1.1 Test for subclause 5.8.3.1.1 (Initiation of the start-up
procedure). 29
A.8.2.1.2 Test for clause 5.8.3.1.2 (Round trip delay determination). 29
A.8.2.1.3 Test for subclause 5.8.3.1.3 (Rate negotiation). 29
A.8.2.1.4 Test for subclause 5.8.3.1.4 (Completion of rate
negotiation) . 30
A.8.2.1.5 Test for subclause 5.8.3.1.5 (Completion of the
hand-shake) . 30
A.8.2.2 Tests for subclause 5.8.3.2 (AMM). 31
A.8.2.2.1 Test for subclause 5.8.3.2.1 (Initiation of the start-up
procedure). 31
A.8.2.2.2 Test for subclause 5.8.3.2.2 (Round trip delay
determination) . 31
A.8.2.2.3 Test for subclause 5.8.3.2.3 (Rate negotiation). 32
A.8.2.2.4 Test for subclause 5.8.3.2.4 (Completion of rate
negotiation) . 32
A.8.2.2.5 Test for subclause 5.8.3.2.5 (Completion of the
hand-shake) . 33
A.8.3 Tests for subclause 5.8.4 (Retrain sequence) . 34
A.8.3.1 Tests for subclause 5.8.4.1 (Initiating signal) . 34
A.8.3.1.1 Tests for subclause 5.8.4.1.1 (CMM). 34
A.8.3.1.2 Tests for subclause 5.8.4.1.2 (AMM). 34
A.8.3.2 Tests for subclause 5.8.4.2 (Response signal) . 34
A.8.3.2.1 Tests for subclause 5.8.4.2.1 (CMM). 34

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A.8.3.2.2 Tests for subclause 5.8.4.2.2 (AMM).34
A.9 Test for subclause 5.9 (Transmission of start-stop characters).34
A.10 Tests for sublause 5.11 (Test loop 2).35
A.10.1 Tests for subclause 5.11.2 (Instigation of a Remote loop 2) .35
A.10.1.1 Transmission of the test loop initiation signal - Test for subclause
5.11.2(a) (Controlling modem under test) .35
A.10.1.2 Response to the test loop initiation signal (Test for subclause 5.11.2(b))
(Controlled modem under test) .35
A.10.2 Tests for subclause 5.11.3 (Termination of a remote test loop 2) .35
A.10.2.1 Transmission of the de-activation signal (Test for subclause 5.11.3(a) -
Controlling modem).35
A.10.2.2 Response to the de-activation signal (Test for subclause 5.11.3(b) -
Controlled modem).36
Annex B (informative): Example proforma for the declaration of modes of operation/use .37
Annex C (informative): Formal description of the start-up sequence.40
Annex D (informative): Bibliography.60
History.61

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Foreword
This second edition European Telecommunication Standard (ETS) has been produced by the
Terminal Equipment (TE) Technical Committee of the European Telecommunications Standards Institute
(ETSI).
This ETS specifies the technical characteristics required for end-to-end interworking over the
Public Switched Telephone Network (PSTN) for 9 600 bit/s or 4 800 bit/s duplex modems standardized for
use over the PSTN.
These requirements are based upon, and do not conflict with, CCITT Recommendation V.32 [2].
Additionally, requirements are included relating to end-to-end interoperability over PSTN connections.
Such requirements are in excess of the CCITT/ITU-T Recommendations.
Except where otherwise indicated, a modem which complies with CCITT Recommendation V.32 [2]
should always meet the requirements of this ETS which relate to parameters specified in that
CCITT Recommendation.
Clause 4 of this ETS references the requirements common to both Category I and Category II modems,
which are contained in clause 4 of final draft prETS 300 114 [1]. The definitions for Category I and
Category II modems can be found in the foreword of final draft prETS 300 114 [1].
Clause 5 of this ETS contains Category II requirements specific to 9 600 bit/s or 4 800 bit/s duplex
modems. In the case of certain functions common to a number of different types of modem
(e.g. auto-answering sequence), reference is made to clause 5 of final draft prETS 300 114 [1], which
contains the relevant requirements.
Transposition dates
Date of adoption of this ETS: 26 April 1996
Date of latest announcement of this ETS (doa): 31 August 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 29 February 1997
Date of withdrawal of any conflicting National Standard (dow): 29 February 1997

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1 Scope
This ETS specifies the technical characteristics required for end-to-end interworking over the
Public Switched Telephone Network (PSTN) of 9 600 bit/s or 4 800 bit/s modems standardized for use
over the PSTN, in accordance with CCITT Recommendation V.32 [2].
The objective of this specification, the application of which is entirely voluntary, is to provide the users with
an added degree of assurance that modems in compliance with this specification can interwork with each
other, under most network conditions.
The term "modem" in the context of this ETS includes all physical implementation practices for a voice
band modem, which is conductively connected to the PSTN.
This ETS specifies six modes of operation, each with up to five modes of use (see subclause 5.2).
This ETS also contains descriptions of the tests to be performed in order to confirm compliance with the
functional requirements contained herein. A general description of the test conditions and test
requirements is given in annex A (normative).
2 Normative references
This ETS incorporates by dated and 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 amendments or revision. For undated references the
latest edition of the publication referred to applies.
[1] Final draft prETS 300 114 (1996): "Public Switched Telephone Network (PSTN);
Basic Category I and Category II specifications for modems standardized for
use on the PSTN".
[2] CCITT Recommendation V.32 (1988): "A family of 2-wire, duplex modems
operating at data signalling rates of up to 9 600 bit/s for use on the general
switched telephone network and on leased lines telephone-type circuits".
[3] ETS 300 001: "Attachments to the Public Switched Telephone Network (PSTN);
General technical requirements for equipment connected to an analogue
subscriber interface in the PSTN".
[4] CCITT Recommendation V.32 bis (1991): "A duplex modem operating at data
signalling rates of up to 14 400 bit/s for use on the general switched telephone
network and on leased point-to-point 2-wire telephone-type circuits".
[5] CCITT Recommendation V.25 (1988): "Automatic answering equipment and/or
parallel automatic calling equipment on the general switched telephone network
including procedures for disabling of echo control devices for both manually and
automatically established calls".
[6] CCITT Recommendation S.33 (1984): "Standardisation of an international text
for the measurement of the margin of start-stop machines using International
Alphabet No 5".
[7] CCITT Recommendation O.153 (1988): "Basic parameters for the measurement
of error performance at bit rates below the primary rate".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the definitions in final draft prETS 300 114 [1] apply, together with the
following:
NOTE: In addition to the following definitions, some other specific definitions are applicable
(see subclauses 5.8.1 and 5.11.1 of this ETS).
Modem Conformance Tester (MCT): A simulator designed to meet the requirements of a modem to the
same recommendation as the modem under test. All individual sub-systems within it are both accessible
(e.g. provide test points and permit functions to be enabled or disabled when required) and externally
controllable (e.g. permit sequences such as the start up procedure to be selectively repeated). These,
within a conformance tester, may be constructed as discrete items of equipment, so as to permit their
assembly into varying configurations required to suit the tests (e.g. the asynchronous to synchronous
converter may be simply applied to a synchronous CCITT Recommendation V.32 [2] conformance tester
to achieve an asynchronous CCITT Recommendation V.32 [2] conformance tester).
As an interim measure, until the conformance tester is defined and such a tester is available, its definition
as agreed to be appropriate by ETSI is that a modem used for reference may be used in its place. In the
case that the modem used for reference has not been shown to conform to the ETS in the relevant modes
of use/operation, the testing authority ensures that the modem used for reference complies with the
relevant ETS to the extent necessary for the performance of the test.
silence: Periods during the handshaking sequences where signals are not transmitted.
period of silence: Measured using start and finish criteria defined below. The levels refer to signals
which, in the relevant frequency band, have an inband power level and are expressed with respect to the
normal transmitted signal level of the modem under test recorded at the point of observation.
start of the period of silence: The instant at which the transmitted signal level drops below a level that is
6 dB below the normal transmit level. The period of silence ends the instant the transmitted signal rises
above a level that is 6 dB below the normal transmit level. During the period of silence at least one instant
is observed where the signal level is at least 30 dB below the normal transmit level.
3.2 Abbreviations
For the purposes of this ETS the following abbreviations apply:
AMM Answer Mode Modem
CcT Circuit
CMM Call Mode Modem
DCE Data Circuit-Terminating Equipment
DTE Data Terminal Equipment
GPA General Polynomial Answer mode modem
GPC General Polynomial Call mode modem
MCT Modem Conformance Tester
MUT Modem Under Test
PSTN Public Switched Telephone Network
4 General requirements
4.1 References to other ETSs
The modem shall comply with final draft prETS 300 114 [1], clause 4.
NOTE: Final draft prETS 300 114 [1] in turn refers to ETS 300 001 [3] for the majority, if not
all, of its requirements.

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4.2 Information to be provided by the applicant
4.2.1 Information required for testing purposes
The applicant shall declare which of the modes of operation/use identified in this ETS the modem is
supposed to undergo tests.
Compliance is considered to have been accomplished by provision of the relevant information.
NOTE: This could be accomplished by completion of forms such as those provided in annex B
(informative).
4.2.2 Instructions for use
Instructions for use shall be made available with the apparatus. The instructions for use shall include:
a) the apparatus or types of apparatus to which the instructions apply;
b) any information specifically indicated in this ETS for inclusion in the "Instructions for use"; and
c) any national restrictions on the use of the apparatus.
Any additional information that has been included shall be disregarded unless it is the subject of another
ETS.
Compliance shall be checked by inspection.
5 Functional requirements specific to Category II modems
5.1 General requirements
To comply with the requirements of this ETS, it shall be necessary that the modem provide:
- duplex mode of operation by means of the modulation scheme specified in
CCITT Recommendation V.32 [2];
- channel separation by echo cancellation techniques;
- quadrature amplitude modulation;
- signalling rates of 4 800 bit/s and/or 9 600 bit/s;
- use of the rate sequence during call establishment to decide the data rate and method of coding;
- means by which the channels may be selected either manually and/or automatically, where a
modem is capable of transmitting in either of the two channels;
- means to respond to a request for a retrain;
- means to respond to a request for an instigation of a digital loop 2.
NOTE 1: The general requirements described above are a subset of
CCITT Recommendation V.32 [2]. In the requirements which follow any deviations
from the strict interpretation of CCITT Recommendation V.32 [2] have been identified.
NOTE 2: In the following, references are made to interchange circuits between the modem and
the DTE, as defined in CCITT Recommendation V.24. However, not all modems
provide an interface with such circuits. For these cases the references to
CCITT Recommendation V.24 type interchange circuits indicate equivalent operation
of a DTE and of a modem where this exists.

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To further comply with this ETS, the interchange circuits (or equivalent) which are required to change state
after an identifiable event or point in time, shall have changed state within a maximum of 3 seconds of that
event, unless otherwise specified.
NOTE 3: This requirement is in addition to CCITT Recommendation V.32 [2].
5.2 Modes of operation/use
The following modes of operation are identified:
- 9 600 bit/s trellis coded, call;
- 9 600 bit/s trellis coded, answer;
- 9 600 bit/s non-redundant coding, call;
- 9 600 bit/s non-redundant coding, answer;
- 4 800 bit/s non-redundant coding, call;
- 4 800 bit/s non-redundant coding, answer.
It shall be possible to configure the modem to operate at either 4 800 bit/s or 9 600 bit/s, in either call
mode or answer mode or both. Optionally, the modem may operate at both 4 800 bit/s and 9 600 bit/s.
Where the modem operates at 9 600 bit/s using trellis coding then non-redundant coding at 9 600 bit/s
shall also be provided.
For each mode of operation to be tested for compliance, the modem shall provide at least one of the
following modes of use:
a) asynchronous with 8 bits per character;
b) asynchronous with 9 bits per character;
c) asynchronous with 10 bits per character;
d) asynchronous with 11 bits per character;
e) synchronous.
In the asynchronous (start-stop) modes of use, the modem shall accept a data stream from the DTE at a
nominal rate of 9 600 bit/s and/or 4 800 bit/s. The asynchronous data to be transmitted shall be converted
into a synchronous data stream in accordance with subclause 5.9 suitable for transmission.
Demodulated data shall be decoded in accordance with subclause 5.5, then descrambled in accordance
with subclause 5.6, it shall then be passed for reconversion into an asynchronous data stream in
accordance with subclause 5.9.
In the synchronous modes of use, the modem shall accept synchronous data from the DTE. The data
shall then be scrambled in accordance with subclause 5.6 and passed to the modulator for encoding in
accordance with subclause 5.5.
Demodulated data shall be decoded in accordance with subclause 5.5, then descrambled in accordance
with subclause 5.6.
The modem shall respond to a request to execute a retrain. Optionally, the modem may also provide
facilities to instigate a retrain during data transmission if the modem detects a loss of equalization.
NOTE: This facility can also be used to effect a change of rate from 9 600 bit/s to 4 800 bit/s
or vice versa, without disconnection from the PSTN.
It shall be the applicant's responsibility to specify for which of the above mentioned modes of
operation/use the modem is supposed to undergo tests.
5.3 Line signals
5.3.1 Transmitted carrier frequency
The carrier frequency transmitted shall be 1 800 Hz ± 1 Hz.
Compliance shall be checked by the method described in annex A, clause A.2.

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5.3.2 Receiver carrier tolerance
The receiver shall be able to operate correctly with a received carrier frequency in the range of 1 800 Hz
± 7 Hz.
Compliance shall be checked by the method described in annex A, clause A.3.
5.3.3 Transmitted spectrum
The national network specific spectral power limits are specified in final draft prETS 300 114 [1], clause 4.
NOTE: Final draft prETS 300 114 [1], clause 4 in turn refers to ETS 300 001 [3].
There are no requirements in this ETS relating to the spectrum of signals presented to the PSTN over and
above those for PSTN access invoked by clause 4 of ETS 300 001 [3].
5.4 Line signalling rates
The signalling rates transmitted to line shall be 2 400 baud ± 0,01 %.
Compliance shall be checked by the method described in annex A, clause A.4.
5.5 Encoding
...