ETSI ETS 300 492 ed.1 (1996-05)

Public Switched Telephone Network (PSTN); Category II specification for 14 400, 12 000, 9 600, 7 200 and 4 800 bits per second duplex modems standardized for use on the PSTN

DE/TE-05033

Javno komutirano telefonsko omrežje (PSTN) – Specifikacija kategorije II za dupleksne modeme s hitrostmi 14 400, 12 000, 9 600, 7 200 in 4 800 b/s, standardizirane za uporabo v omrežjih 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 300 492 E1:2003 - Public Switched Telephone Network (PSTN); Category II specification for 14 400, 12 000, 9 600, 7 200 and 4 800 bits per second duplex modems standardized for use on the PSTN

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 492 E1:2003
01-december-2003
Javno komutirano telefonsko omrežje (PSTN) – Specifikacija kategorije II za
dupleksne modeme s hitrostmi 14 400, 12 000, 9 600, 7 200 in 4 800 b/s,
standardizirane za uporabo v omrežjih PSTN
Public Switched Telephone Network (PSTN); Category II specification for 14 400, 12
000, 9 600, 7 200 and 4 800 bits per second duplex modems standardized for use on the
PSTN
Ta slovenski standard je istoveten z: ETS 300 492 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 492 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 492 E1:2003

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SIST ETS 300 492 E1:2003
EUROPEAN ETS 300 492
TELECOMMUNICATION May 1996
STANDARD
Source:ETSI TC-TE Reference:DE/TE-05033
ICS: 33.020
modem, PSTN
Key words:
Public Switched Telephone Network (PSTN);
Category II specification for 14 400, 12 000, 9 600, 7 200 and
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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ETS 300 492: May 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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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.10
4.2.1 Information required for testing purposes .10
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.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 .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 .16
5.8.2.1 Calling tone.16
5.8.2.2 Answer tone recognition .16
5.8.2.3 Answering 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 start-up procedure .16
5.8.3.1.2 Round trip delay determination.16
5.8.3.1.3 Start of 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 Start of 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).19
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
5.8.5 Rate renegotiation procedure.20
5.8.5.1 Initiating procedure .20

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5.8.5.1.1 Call Mode Modem (CMM) . 21
5.8.5.1.2 Answer Mode Modem (AMM) . 21
5.8.5.2 Responding procedure. 22
5.8.5.2.1 Call Mode Modem (CMM) . 22
5.8.5.2.2 Answer Mode Modem (AMM) . 22
5.8.6 Compatibility with V.32 modems. 23
5.8.6.1 Call Mode Modem. 23
5.8.6.2 Answer Mode Modem . 23
5.9 Transmission of start-stop characters. 23
5.10 Threshold of received line signal detector. 23
5.11 Test loop 2. 23
5.11.1 Definitions . 24
5.11.2 Instigation of a remote loop 2 . 24
5.11.3 Termination of a remote loop 2. 24
5.12 Receiver performance. 25
5.12.1 Normal case. 25
5.12.2 Case with satellite delay . 25
Annex A (normative): Testing methods . 27
A.1 General testing conditions . 27
A.1.1 General notes. 27
A.1.1.1 Test set-up. 27
A.1.1.2 Determination of signals . 27
A.1.2 Limitation of number of tests. 28
A.1.2.1 Introduction . 28
A.1.2.2 General rules . 28
A.1.2.3 Specific rules . 28
A.1.3 Proposed order for performing the tests . 29
A.2 Test for subclause 5.3.1 (Transmitted carrier frequency). 30
A.3 Test for subclause 5.3.2 (Receiver carrier tolerance) . 30
A.4 Test for subclause 5.4 (Line signalling rates). 30
A.5 Test for subclause 5.5 (Encoding of data). 31
A.6 Test for subclause 5.6 (Scrambler and descrambler) . 31
A.7 Test for subclause 5.7 (Channel allocation) . 31
A.8 Test for subclause 5.8 (Hand-shaking sequences). 31
A.8.1 Test for subclause 5.8.2 (Calling and answering procedures). 31
A.8.1.1 Test for subclause 5.8.2.1 (Calling tone). 31
A.8.1.2 Test for subclause 5.8.2.2 (Answer tone recognition) . 32
A.8.1.3 Test for subclause 5.8.2.3 (Answering tone generation) . 32
A.8.2 Tests for subclause 5.8.3 (Start-up procedure) . 32
A.8.2.1 Tests for subclause 5.8.3.1 (CMM) . 32
A.8.2.1.1 Test for subclause 5.8.3.1.1 (Initiation of the start-up
procedure). 32
A.8.2.1.2 Test for subclause 5.8.3.1.2 (Round trip delay
determination) . 32
A.8.2.1.3 Test for subclause 5.8.3.1.3 (Start of rate negotiation). 32
A.8.2.1.4 Test for subclause 5.8.3.1.4 (Completion of the rate
negotiation) . 33
A.8.2.1.5 Test for subclause 5.8.3.1.5 (Completion of the hand-
shake) . 34
A.8.2.2 Tests for subclause 5.8.3.2 (AMM). 34
A.8.2.2.1 Test for subclause 5.8.3.2.1 (Initiation of the start-up
procedure). 34
A.8.2.2.2 Test for subclause 5.8.3.2.2 (Round trip delay
determination) . 35

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A.8.2.2.3 Test for subclause 5.8.3.2.3 (Start of rate negotiation) .35
A.8.2.2.4 Test for subclause 5.8.3.2.4 (Completion of rate
negotiation).35
A.8.2.2.5 Test for subclause 5.8.3.2.5 (Completion of the hand-
shake).36
A.8.3 Tests for subclause 5.8.4 (Retrain sequence).37
A.8.3.1 Tests for subclause 5.8.4.1 (Initiating signal).37
A.8.3.1.1 Tests for subclause 5.8.4.1.1 (CMM) .37
A.8.3.1.2 Tests for subclause 5.8.4.1.2 (AMM).37
A.8.3.2 Tests for subclause 5.8.4.2 (Response signal).37
A.8.3.2.1 Tests for subclause 5.8.4.2.1 (CMM) .37
A.8.3.2.2 Tests for subclause 5.8.4.2.2 (AMM).37
A.8.4 Tests for subclause 5.8.5 (Rate renegotiation procedures).38
A.8.4.1 Tests for subclause 5.8.5.1 (Initiating procedure).38
A.8.4.1.1 Tests for subclause 5.8.5.1.1 (CMM) .38
A.8.4.1.2 Tests for subclause 5.8.5.1.2 (AMM).39
A.8.4.2 Tests for subclause 5.8.5.2 (Responding procedure) .41
A.8.4.2.1 Tests for subclause 5.8.5.2.1 (CMM) .41
A.8.4.2.2 Tests for subclause 5.8.5.2.2 (AMM).42
A.8.5 Tests for subclause 5.8.6 (compatibility with V.32 modems).43
A.8.5.1 Test for subclause 5.8.6.1 (CMM).43
A.8.5.2 Test for subclause 5.8.6.2 (AMM) .43
A.9 Test for subclause 5.9 (Transmission of start-stop characters).44
A.10 Tests for subclause 5.11 (Test loop 2).44
A.10.1 Tests for subclause 5.11.2 (Instigation of a remote loop 2).44
A.10.1.1 Transmission of the test loop initiation signal - Test for subclause
5.11.2(a) (Controlling MUT).44
A.10.1.2 Response to the test loop initiation signal (Test for subclause 5.11.2(b))
(Controlled modem under test) .44
A.10.2 Tests for subclause 5.11.3 (Termination of a remote test loop 2) .45
A.10.2.1 Transmission of the de-activation signal (Test for subclause 5.11.3(a))
(Controlling modem).45
A.10.2.2 Response to the de-activation signal (Test for subclause 5.11.3(b))
(Controlled modem) .45
Annex B (informative): Example proforma for the declaration of modes of operation/use .46
Annex C (informative): Bibliography.51
History.52

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Foreword
This 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 14 400 bit/s, 12 000 bit/s, 9 600 bit/s, 7 200 bit/s and 4 800 bit/s
modems standardized for use over the PSTN.
These requirements are based upon, and do not conflict with, CCITT Recommendation V.32 bis [1].
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 bis [1]
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 [2]. The definitions for Category I and
Category II modems can be found in the foreword of final draft prETS 300 114 [2].
Clause 5 of this ETS contains Category II requirements specific to CCITT Recommendation V.32 bis [1]
modems. In the case of a certain function common to more than one type of modem (e.g. auto-answering
sequence) reference is made to clause 5 of final draft prETS 300 114 [2], 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 European Telecommunication Standard (ETS) specifies the technical characteristics required for
end-to-end interworking over the Public Switched Telephone Network (PSTN) of 14 400 bit/s, 12 000 bit/s,
9 600 bit/s, 7 200 bit/s and 4 800 bit/s duplex modems standardized for use over the PSTN, in accordance
with CCITT Recommendation V.32 bis [1].
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 ten 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
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] 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".
[2] Final draft prETS 300 114: "Public Switched Telephone Network (PSTN); Basic
Category I and Category II specifications 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 9 600 bit/s for use on the general
switched telephone network and on leased telephone-type circuits".
[4] 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".
[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 [2] apply together with the
following.
NOTE: In addition to the following definitions, some other specific definitions apply (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 (MUT). 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 bis [1] conformance
tester to achieve an asynchronous CCITT Recommendation V.32 bis [1] conformance tester).
As an interim measure, until the conformance tester is defined and is available, its definition agreed to be
appropriate by ETSI, 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.
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
TE Terminal Equipment
4 General requirements
4.1 References to other ETSs
The modem shall comply with final draft prETS 300 114 [2], clause 4.
NOTE: Final draft prETS 300 114 [2] in turn refers to ETS 300 001 [4] 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, the modem is
supposed to undergo tests.
Compliance shall be 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).

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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 bis [1];
- channel separation by echo cancellation techniques;
- quadrature amplitude modulation;
- signalling rates of 14 400 bit/s, 12 000 bit/s, 9 600 bit/s, 7 200 bit/s and 4 800 bit/s;
- compatibility with CCITT Recommendation V.32 [3] modems;
- 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;
- means to respond to a request for a rate renegotiation.
NOTE 1: The general requirements described above are a subset of CCITT Recommendation
V.32 bis [1]. In the requirements which follow any deviations from the strict
interpretation of CCITT Recommendation V.32 bis [1] 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 bis [1].
Interworking with 9 600 bit/s uncoded modulation is not mandatory for CCITT Recommendation V.32 bis
[1] modems.
5.2 Modes of operation/use
The following modes of operation are identified:
- 14 400 bit/s trellis coded, call;
- 14 400 bit/s trellis coded, answer;
- 12 000 bit/s trellis coded, call;
- 12 000 bit/s trellis coded, answer;
- 9 600 bit/s trellis coded, call;
- 9 600 bit/s trellis coded, answer;
- 7 200 bit/s trellis coded, call;
- 7 200 bit/s trellis coded, 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 all of the mentioned data signalling rates, in
either call mode or answer mode or both.
For each mode of operation identified for Category II testing, 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
one of the nominal rates as mentioned above. 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.
The modem shall respond to a request to execute a rate renegotiation procedure. Optionally, the modem
may als
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