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

SLOVENSKI STANDARD
SIST ETS 300 002 E1:2003
01-december-2003

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Public Switched Telephone Network (PSTN); Category II attachment requirements for 9

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

Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the

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.

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

5.8.2.3 Auto-answering .............................................................. 17

5.8.3 Start-up procedure ................................................................................. 17

5.8.4 Retrain sequence ................................................................................... 20

5.8.4.1 Initiating signal................................................................ 20

5.8.4.2 Response signal ............................................................. 20

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

negotiation) ....................................................................30

shake) ...........................................................................30

A.8.2.2 Tests for subclause 5.8.3.2 (AMM)..........................................................31

tone)..............................................................................31

determination) ................................................................32

negotiation) ....................................................................32

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.8.3.2 Tests for subclause 5.8.4.2 (Response Signal)......................................... 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

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

(Controlling modem) ............................................................................... 35

(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

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

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

Additionally, requirements are included relating to end-to-end interoperability over PSTN connections. Such

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

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

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

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

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

The term "modem" in the context of this ETS includes all physical implementation practices for a voice

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

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

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

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

in the standard call mode by the modem at the calling station, in order to ensure proper connection and

If calls are established on the PSTN by operators, or for leased line operation, bilateral agreement on the

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

If calls are established on the PSTN by operators, or for leased line operation, bilateral agreement on the

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

Modem: a functional unit that modulates and demodulates signals in order to enable digital data to be

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

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

- to meet the requirements of the same CCITT Recommendation(s) as the modem under test, to the

- to provide the functionalities for a modem used for reference that are specified in the relevant

- to provide an interface which is accessible and of a type suitable for use in the tests (e.g. CCITT

Where the applicant has provided the modem used for reference and the test fails, the testing authority

Modes of operation: modes specified in this modem specific ETS, that have an influence upon line signals

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

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

NOTE: Usually, a modem in on-line state is potentially capable of sending or receiving

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

NOTE: ETS 300 114 in turn refers to ETS 300 001 [1] for the majority, if not all, of its

The applicant shall declare for which of the modes of operation/use identified in this ETS approval to

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

Instructions for use shall be made available with the apparatus. The instructions for use shall include:

b) any information specifically indicated in this ETS for inclusion in the "Instructions for use"; and

Any additional information that has been included shall be disregarded unless it is the subject of another

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

- 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

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

NOTE 2: In the following, references are made to interchange circuits between the modem and

Recommendation V.24 type interchange circuits indicate equivalent operation of a DTE

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

For each mode of operation identified for approval to Category II, the modem shall provide at least one of

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

Demodulated data shall be decoded in accordance with subclause 5.5, then descrambled in accordance