ETSI ETS 300 002 ed.1 (1992-02)

SLOVENSKI STANDARD
SIST ETS 300 002 E1:2003
01-december-2003
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Y3671
Public Switched Telephone Network (PSTN); Category II attachment requirements for 9
600 or 4 800 bits per second duplex modems standardised for use on the PSTN
(Candidate NET 25)
Ta slovenski standard je istoveten z: ETS 300 002 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 002 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 002 E1:2003

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SIST ETS 300 002 E1:2003
EUROPEAN ETS 300 002
TELECOMMUNICATION February 1992
STANDARD
Source: ETSI TC-TE Reference: T/TE 04-09
ICS:
PSTN, Modems
Key words:
Public Switched Telephone Network (PSTN);
Category II attachment requirements for 9600 or 4800 bits per
second duplex modems standardised for use on the PSTN
(Candidate NET 25)
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 - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 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 1992. All rights reserved.
New presentation - see History box

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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 Standards Approval 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.9
3.1 Definitions.9
3.2 Abbreviations. 11
4 General requirements . 11
4.1 References to other ETSs . 11
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 . 12
5.1 General requirements. 12
5.2 Modes of operation/use. 12
5.3 Line signals. 13
5.3.1 Transmitted carrier frequency. 13
5.3.2 Receiver carrier tolerance. 13
5.3.3 Transmitted spectrum. 13
5.4 Line signalling rates. 14
5.5 Encoding of data. 14
5.6 Scrambler and descrambler. 14
5.7 Channel allocation . 14
5.7.1 Channel selection . 14
5.7.2 Automatic channel selection . 14
5.8 Hand-shaking sequences . 15
5.8.1 Definitions. 15
5.8.2 Auto-calling and auto-answering procedures. 17
5.8.2.1 Auto-calling - calling tone. 17
5.8.2.2 Auto-calling - recognition of answering tone . 17
5.8.2.3 Auto-answering . 17
5.8.3 Start-up procedure . 17
5.8.3.1 Call Mode Modem (CMM). 17
5.8.3.1.1 AA signal. 17
5.8.3.1.2 Round trip delay determination . 17
5.8.3.1.3 Rate negotiation. 18
5.8.3.1.4 Completion of the rate negotiation . 18
5.8.3.1.5 Completion of the hand-shake . 18
5.8.3.2 Answer Mode Modem (AMM). 18
5.8.3.2.1 Transmission of answer tone. 18
5.8.3.2.2 Round trip delay determination . 19
5.8.3.2.3 Rate negotiation. 19
5.8.3.2.4 Completion of rate negotiation. 19
5.8.3.2.5 Completion of the hand-shake . 20
5.8.4 Retrain sequence . 20
5.8.4.1 Initiating signal. 20
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). 21

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5.8.4.2.2 Answer Mode Modem (AMM) .21
5.9 Transmission of start-stop characters.21
5.10 Threshold of received line signal detector.21
5.11 Test loop 2 .21
5.11.1 Definitions.22
5.11.2 Instigation of a remote loop 2 .22
5.11.3 Termination of a remote loop 2.22
5.12 Receiver performance .23
5.12.1 Normal case.23
5.12.2 Case with satellite delay .23
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 (Auto-calling and answering procedures) .28
A.8.1.1 Test for subclause 5.8.2.1 (Auto-calling - calling tone).28
A.8.1.2 Test for subclause 5.8.2.2 (Auto-calling - recognition of answering tone) .28
A.8.1.3 Test for subclause 5.8.2.3 (Auto-answering).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 (AA signal).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 (Transmission of answer
tone).31
A.8.2.2.2 Test for subclause 5.8.3.2.2 (Round trip delay
determination) .32
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

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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
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) . 35
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. 58
History. 59

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Foreword
This European Telecommunications Standard (ETS) has been produced by the Terminal Equipment (TE)
Technical Committee of the European Telecommunications Standards Institute (ETSI). The text of this ETS
may be utilized, wholly or in part, for the establishment of NET 25.
This ETS contains the technical requirements for approval to Category II of 9600 or 4800 bits per second
duplex modems standardised for use on the Public Switched Telephone Network (PSTN). Testing and
approval to Category II is applicable only at the request of the applicant. These requirements are based
upon, and do not conflict with, CCITT Recommendation V.32 [3] (9600 bits per second duplex modem
standardised for use on the General Switched Telephone Network, 1988).
Additionally, requirements are included relating to end-to-end interoperability over PSTN connections. Such
requirements are in excess of the CCITT Recommendations.
Except where otherwise indicated a modem which complies with CCITT Recommendation V.32 [3] 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 ETS 300 114 [2]. The definitions for Category I and Category II
modems can be found in the foreword of ETS 300 114 [2].
Clause 5 of this ETS contains Category II requirements specific to 9600 or 4800 bits per second 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 ETS 300 114 [2], which contains the relevant
requirements.
Every ETS prepared by ETSI is a voluntary standard. This ETS has been prepared as a candidate NET
which may be transposed, in whole or in part, into a mandatory NET by the Technical Recommendations
Application Committee (TRAC). It therefore contains text concerning type approval of the equipment to
which it relates. This text should be considered only as a guidance and does not make this ETS
mandatory.

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1 Scope
This ETS specifies the technical characteristics to be met by modems seeking Category II approval for
duplex operation over the PSTN at 9600 or 4800 bits per second. The modulation scheme specified is that
described in CCITT Recommendation V.32 [3].
The term "modem" in the context of this ETS includes all physical implementation practices for a voice
band modem, which are galvanically connected to the PSTN.
This ETS specifies six modes of operation, each with 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
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] 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, (Candidate NET 4)".
[2] ETS 300 114 (1990): "Attachments to the Public Switched Telephone Network
(PSTN); Basic attachment requirements for modems standardized for use on the
PSTN".
[3] CCITT Recommendation V.32 (1988): "A family of 2-wire duplex modems
operating at data signalling rates of up to 9600 bit/s for use on the general
switched telephone network and on leased lines telephone-type circuits".
[4] 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".
[5] 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".
[6] CCITT Recommendation O.153 (1988): "Basic parameters for the measurement
of error performance at bit rates below the primary rate".
3 Definitions and abbreviations
3.1 Definitions
For the purpose of this ETS the definitions in ETS 300 114 [2] 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).
Answer mode: when calls are established with automatic facilities, a standard answer mode shall be used
by the modem at the answering station. This mode consists of conventional characteristics (e.g. use of
high channel carrier frequency or particular scrambler generating polynomial) complementary to those used

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in the standard call mode by the modem at the calling station, in order to ensure proper connection and
inter-working.
If calls are established on the PSTN by operators, or for leased line operation, bilateral agreement on the
use of call mode and answer mode shall be necessary.
Call mode: when calls are established with automatic facilities, a standard call mode shall be used by the
modem at the calling station. This mode consists of conventional characteristics (e.g. use of low channel
carrier frequency or particular scrambler generating polynomial) complementary to those used in the
standard answer mode by the modem at the answering station, in order to ensure proper connection and
inter-working.
If calls are established on the PSTN by operators, or for leased line operation, bilateral agreement on the
use of call mode and answer mode shall be necessary.
Data Terminal Equipment (DTE): in the context of this ETS, the expression "DTE" is used to define the
origin and destination of signals present at the digital interface of a modem. This expression does not
require that a "commercial data terminal" be present to receive or generate such signals; a tester or any
other suitable device may monitor or generate such signals.
Modem: a functional unit that modulates and demodulates signals in order to enable digital data to be
transmitted over analogue transmission facilities.
Modem Conformance Tester (MCT): this is essentially 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 [3]
conformance tester to achieve an asynchronous CCITT Recommendation V.32 [3] conformance tester).
As an interim measure, until the conformance tester is defined, its definition agreed to be appropriate by
ETSI, and such a tester is available, a modem used for reference may be used in its place. In the absence
of previous approval to Category II of the modem used for reference, in the relevant modes of
use/operation, the testing authority shall ensure that the modem used for reference complies with the
relevant ETS to the extent necessary for the performance of the test.
Modem used for reference: a modem used for some of the tests specified herein or in another modem
specific ETS. A modem used for reference may, at the discretion of the applicant, be provided by the
testing authority or by himself. It shall be designed:
- to meet the requirements of the same CCITT Recommendation(s) as the modem under test, to the
extent necessary for performing the tests;
- to provide the functionalities for a modem used for reference that are specified in the relevant
testing Clauses; and
- to provide an interface which is accessible and of a type suitable for use in the tests (e.g. CCITT
Recommendation V.24).
Where the applicant has provided the modem used for reference and the test fails, the testing authority
may not be in a position to determine the precise reason for failure.
Modes of operation: modes specified in this modem specific ETS, that have an influence upon line signals
present at the PSTN interface.
Modes of use: modes specified in this modem specific ETS, that have an influence upon conditions
present at a digital interface. For example, a "conventional" CCITT Recommendation V.24 interface or a
PC bus interface in the case of an integral modem .

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On-line state: the on-line state or condition is defined as an electrical condition into which, when
connected to the network, a modem is placed such that it draws enough current to be capable of activating
the exchange.
NOTE: Usually, a modem in on-line state is potentially capable of sending or receiving
speechband information to, or from, the network.
Silence: signals which in the relevant frequency band have an in-band power level which is at least 30 dB
below the level of the transmitted signal at the point of measurement. This term is used to describe periods
where signals are not transmitted during the handshaking sequences.
3.2 Abbreviations
For the purpose of this ETS the following abbreviations apply.
AMM Answer Mode Modem
CCITT Comité Consultatif International Télégraphique et Téléphonique
CCT Circuit
CEPT Conférence Européenne des Administrations des Postes et des
Télécommunications
CMM Call Mode Modem
DCE Data Circuit-Terminating Equipment
DTE Data Terminal Equipment
ETS European Telecommunication Standard
ETSI European Telecommunications Standards Institute
GPA General Polynomial Answer mode modem
GPC General Polynomial Call mode modem
MCT Modem Conformance Tester
MUT Modem Under Test
NET Norme Européene de Télécommunication
PSTN Public Switched Telephone Network
4 General requirements
4.1 References to other ETSs
The modem shall comply with ETS 300 114 [2], Clause 4.
NOTE: ETS 300 114 in turn refers to ETS 300 001 [1] for the majority, if not all, of its
requirements.
4.2 Information to be provided by the applicant
4.2.1 Information required for testing purposes
The applicant shall declare for which of the modes of operation/use identified in this ETS approval to
Category II is sought.
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

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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 [3];
- channel separation by echo cancellation techniques;
- quadrature amplitude modulation;
- signalling rates of 4800 bit/s and/or 9600 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 [3]. In the requirements which follow any deviations from the strict interpretation of
CCITT Recommendation V.32 [3] 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.
5.2 Modes of operation/use
The following modes of operation are identified:
- 9600 bit/s Trellis coded, call;
- 9600 bit/s Trellis coded, answer;
- 9600 bit/s non-redundant coding, call;
- 9600 bit/s non-redundant coding, answer;
- 4800 bit/s non-redundant coding, call;
- 4800 bit/s non-redundant coding, answer.

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It shall be possible to configure the modem to operate at either 4800 bit/s or 9600 bit/s. Optionally the
modem may operate at both 4800 bit/s and 9600 bit/s. Where the modem operates at 9600 bit/s using
trellis coding then non-redundant coding at 9600 bit/s shall also be provided.
For each mode of operation identified for approval to Category II, 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 9600 bits per second and/or 4800 bits per second. 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 asy
...