ETSI ETS 300 114 ed.2 (1996-05)
Public Switched Telephone Network (PSTN); Basic Category I and Category II specifications for modems standardized for use on the PSTN
Public Switched Telephone Network (PSTN); Basic Category I and Category II specifications for modems standardized for use on the PSTN
RE/TE-05045
Javno komutirano telefonsko omrežje (PSTN) – Specifikacije osnovne kategorije I in kategorije II za modeme, standardizirane za uporabo v PSTN
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST ETS 300 114 E2:2003
01-december-2003
Javno komutirano telefonsko omrežje (PSTN) – Specifikacije osnovne kategorije I
in kategorije II za modeme, standardizirane za uporabo v PSTN
Public Switched Telephone Network (PSTN); Basic Category I and Category II
specifications for modems standardized for use on the PSTN
Ta slovenski standard je istoveten z: ETS 300 114 Edition 2
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 114 E2:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST ETS 300 114 E2:2003
EUROPEAN ETS 300 114
TELECOMMUNICATION May 1996
STANDARD Second Edition
Source:ETSI TC-TE Reference:RE/TE-05045
ICS: 33.020
modem, PSTN, testing
Key words:
Public Switched Telephone Network (PSTN);
Basic Category I and Category II specifications
for 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 - 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 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 .11
3.1 Definitions .11
3.2 Abbreviations .12
4 Common requirements.13
4.1 General notes .13
4.2 PSTN access requirements.13
4.3 Information to be provided by the applicant.13
4.3.1 Information required for testing purposes .13
4.3.1.1 List of modes .13
4.3.1.2 Other items .13
4.3.2 Instructions for use.14
5 Requirements common to some Category II modems .14
5.1 General notes .14
5.2 Call establishment sequence based upon CCITT Recommendation V.25.14
5.2.1 For modems initiating calls.14
5.2.1.1 Calling tone generation.14
5.2.1.2 Answering tone detection .15
5.2.2 For modems answering calls .15
5.3 Test loop implementation based upon CCITT Recommendation V.54 .15
5.3.1 General.15
5.3.2 Remote digital test loop (loop 2).16
5.3.3 Local analogue test loop (loop 3) .16
5.4 Threshold of received line signal detection.16
5.5 Requirements for modems providing asynchronous to synchronous conversion based
upon CCITT Recommendation V.14 .17
5.5.1 General.17
5.5.2 Transmission of start-stop characters.17
5.5.2.1 Signalling rate ranges of the start-stop characters at the
modem input.17
5.5.2.2 Start-stop character format.17
5.5.2.3 Asynchronous to synchronous conversion .18
5.5.2.3.1 Transmitter.18
5.5.2.3.2 Receiver.18
5.5.2.3.3 Break signal .19
5.5.2.3.3.1 Transmitter.19
5.5.2.3.3.2 Receiver.19
5.6 Performance .19
5.6.1 Overall performance.19
5.6.2 Performance in the presence of metering pulses .19
Annex A (informative): Testing methods for national variants for clause 4.21
A.1 General notes.21
Annex B (normative): Testing methods for clause 5 .22
B.1 General conditions for test .22
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B.2 Tests of the call establishment sequence specified in subclause 5.2 . 22
B.2.1 For modems initiating calls. 22
B.2.1.1 Calling tone. 22
B.2.1.2 Detection of answering tone . 23
B.2.2 For modems answering calls . 23
B.3 Tests to verify the test loop implementation specified in subclause 5.3. 23
B.4 Tests to verify the threshold of line signal detection. 23
B.5 Tests to verify the process of asynchronous to synchronous conversion specified in subclause
5.5. 24
B.5.1 Test patterns . 24
B.5.1.1 General . 24
B.5.1.2 Standard test text. 24
B.5.1.3 Discrete Test Characters (DTC). 25
B.5.2 Data signalling rates. 25
B.5.3 Tests . 26
B.5.3.1 Transmitter tests. 26
B.5.3.1.1 Omission of stop elements . 26
B.5.3.1.2 Over-speed and under-speed capabilities . 26
B.5.3.1.3 Arbitrary character spacing . 27
B.5.3.1.4 Break signal transmission. 28
B.5.3.2 Receiver tests. 28
B.5.3.2.1 Over-speed capability . 28
B.5.3.2.2 Under-speed capability . 29
B.5.3.2.3 Character recovery. 29
B.5.3.2.4 Break signal reception . 29
B.6 Performance testing methodology. 29
B.6.1 General. 29
B.6.2 Definitions. 30
B.6.3 Method of measurement . 31
B.6.3.1 Test set-up. 32
B.6.3.2 Test 1. 34
B.6.3.3 Test 2. 37
B.6.3.4 Test 3. 38
Annex C (normative): Description of specialised test facilities, specification of test lines for use in
assessing the performance of Category II modems. 39
C.1 General. 39
C.2 Test set-up. 39
C.2.1 Simulated PSTN conditions . 40
C.3 Test Line 1 transmission characteristics . 45
C.3.1 Local line simulators. 45
C.3.2 Trunk network simulator. 45
C.3.3 Permanent impairments. 46
C.3.3.1 Insertion loss. 46
C.3.3.2 White noise. 46
C.3.3.3 Frequency offset and Phase roll. 55
C.3.3.4 Phase jitter. 55
C.3.3.5 Echo. 55
C.3.3.6 Harmonic distortion. 55
C.4 Test Line 2 transmission characteristics . 55
C.4.1 Local line simulators. 55
C.4.2 Trunk network simulator. 63
C.4.3 Permanent impairments. 63
C.4.3.1 Insertion loss. 63
C.4.3.2 Frequency offset and phase roll . 63
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C.4.3.3 Phase jitter .63
C.4.3.4 Echo .63
C.4.3.5 Harmonic distortion .64
C.4.3.6 Noise floor .64
C.5 Test Line 3 transmission characteristics .64
Annex D (normative): Provision of test tools .65
Annex E (informative): Example of proforma chart for information request.66
Annex F (informative): Bibliography.67
History.68
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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 is one of a series of ETSs which are applicable to modems. Details of the current series are
given in clause 2 of this ETS (Normative references, numbers [1] to [7] inclusive).
This second edition was produced in order to solve some technical errors and problems that were
reported on the first version, as well as to reflect the changed regulatory environment in relation to type
approval. Where the first edition of the document defines in detail Category I and II approvals concept (in
which only Category I approval was mandatory), this second edition still uses the Category I and II
terminology. However, these documents, unlike their predecessors, which were used as the basis of the
NETs 20 to 25, are not intended for regulatory application.
The regulatory approval of a modem does not require the modem to comply, for instance, with any of the
V.series of CCITT/ITU-T Recommendations, nor does it require the modem to function or perform as a
modem. An approved modem may or may not be in compliance with certain CCITT/ITU-T
Recommendations. However since this is not tested, no assurance of interworking is implied.
Conformity to a Category II specification, which is entirely voluntary and only applicable when the supplier
requests it, is only available to modems providing certain combinations of functionality based on the
modem specific V.series CCITT/ITU-T Recommendations. The object of this Category II specification is to
provide the user with the assurance that a modem can interwork, under most network conditions, with
other compatible Category II modems.
NOTE 1: However, as the PSTN is primarily engineered to convey speech traffic, connections
not permitting satisfactory data transmission can occur.
To be in conformance with the Category II specifications, and hence be called a “Category II modem” the
modem needs, in addition to meeting the appropriate approval requirements, to meet the requirements
given in one or more modem-specific ETS (final draft prETS 300 002 [6], ETS 300 115 [2] and final draft
prETSs 300 116 to 300 118 ([3] to [5])). Certain requirements common to more than one specific ETS are
included, for simplicity in clause 4 and annexes B, C and D, and are referred to (as required) in the
modem-specific ETSs. The degree of compliance required by these ETSs with any V. series of
CCITT/ITU-T Recommendation has been intentionally limited to that which might reasonably be
considered necessary in order to provide the intended assurance of inter-working between modems. In
particular, there is no requirement that the digital interface of the modem conform to any particular
physical realisation or functionality, and with certain identified exceptions, there are no requirements
relating to the digital interface.
For instance, the following types are examples of features which do not affect modem to modem
interworking and do not prevent the modem from being in conformance with the Category II specification,
as long as it meets the requirements of the appropriate modem-specific ETS:
- PC integral modems that present a bus interface;
- modems employing a proprietary auto-dialling protocol;
- "intelligent" modems that may send messages to a DTE;
- multi-mode modems that may connect to a variety of modem types.
Any modem that can be configured to meet the relevant requirements can potentially be found conforming
to this Category II specification and hence be considered as a “Category II modem” for that mode of
operation.
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It is acceptable for a modem to be tested against Category II specifications in only some of its potential
operating modes. Where this is the case, it is necessary to, in other operating modes to be used on the
PSTN, meet the appropriate approval requirements. The "Instructions for Use" make it clear to the user
those modes which the modem has found to comply with the requirements for contained in the Category II
specification.
The requirements and the descriptions of the associated tests described in this ETS are specified to
provide correct inter-working with the PSTN, minimise the risk of hazardous electrical conditions
appearing on the PSTN, minimise the risk conditions occurring on the PSTN which might create hazards
for those using the modem and to ensure end-to-end interpretability between modems in compatible
configurations.
NOTE 2: Compliance with a modem specific ETS provides to the user an added degree of
assurance of interoperability over the PSTN. However, as the PSTN is primarily
engineered to convey speech traffic, connections not permitting satisfactory data
transmission can occur.
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 second edition European Telecommunication Standard (ETS) contains the technical characteristics
required for end-to-end interworking over the Public Switched Telephone Network (PSTN). Clauses of this
ETS also contain Category II specifications define for certain features which may be provided by some
modems, but the requirements in these parts are only applicable when invoked by a modem specific ETS.
The term "modem" in the context of this ETS includes all physical implementation practices for voice band
modems which are conductively connected to the PSTN.
NOTE: This implies that certain types of modems, e.g. acoustically coupled and cordless
modems, are outside the scope of this ETS.
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 for clause 4 is given in annex A (informative) and for clause 5 in annex B (normative).
Annex C (normative) describes the testing facilities which a testing laboratory may need to provide.
Annex D (normative) indicates additional equipment, or software, that applicants may need to provide in
order that testing to Category II can be achieved.
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 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 300 001: "Attachments to Public Switched Telephone Network (PSTN);
General technical requirements for equipment connected to an analogue
subscriber interface in the PSTN".
[2] ETS 300 115 (1991): "Attachments to the Public Switched Telephone Network
(PSTN); Category II attachment requirements for 300 bits per second duplex
modems standardized for use on the PSTN [Candidate NET 21]".
[3] Final draft prETS 300 116 (1996): "Public Switched Telephone Network (PSTN);
Category II specification for 1 200 bits per second duplex modems standardized
for use on the PSTN".
[4] Final draft prETS 300 117 (1996): "Public Switched Telephone Network (PSTN);
Category II specification for 2 400 bits per second duplex modems standardized
for use on the PSTN".
[5] Final draft prETS 300 118 (1996): "Public Switched Telephone Network (PSTN);
Category II specification for 1 200 bits per second half-duplex and 1 200/75 bits
per second asymmetrical duplex modems standardized for use on the PSTN".
[6] Final draft prETS 300 002 (1996): "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".
[7] Final draft prETS 300 492 (1996): "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".
[8] CCITT Recommendation V.24 (1984): "List of definitions for interchange circuits
between Data Terminal Equipment and Data Circuit-Terminating Equipment".
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[9] CCITT Recommendation V.14 (1988): "Transmission of start-stop characters
over synchronous bearer channels".
[10] CCITT Recommendation V.25 (1984): "Automatic answering equipment and/or
parallel automatic calling equipment on the general switched telephone network
including procedures for the disabling of echo control devices for both manually
and automatically established calls".
[11] CCITT Recommendation V.21 (1984): "300 bits per second duplex modem
standardized for use in the General Switched Telephone Network".
[12] CCITT Recommendation V.54 (1984): "Loop test devices for modems".
[13] CCITT Recommendation V.4 (1984): "General structure of signals of
international alphabet No. 5 code for data transmission over public telephone
networks".
[14] CCITT Recommendation S.33 (1984): "Standardization of an international text
for the measurement of the margin of start-stop machines using International
Alphabet No. 5".
[15] CCITT Recommendation V.52 (1984): "Characteristics of distortion and error-
rate measuring apparatus for data transmission".
[16] CCITT Recommendation V.22 (1984): "1200 bits per second duplex modem
standardized for use in the general switched telephone network and on point-to-
point 2-wire leased telephone-type circuits".
[17] CCITT Recommendation V.22bis (1988): "2400 bits per second duplex modem
using the frequency division technique standardized for use on the general
switched telephone network and on point-to-point 2-wire leased telephone-type
circuits".
[18] CCITT Recommendation V.23 (1984): "600/1200-baud modem standardized for
use in the General Switched Telephone Network".
[19] CCITT Recommendation V.32 (1984): "A family of 2-wire, duplex modems
operating at data signalling rates up to 9600 bits/s for use on the general
switched telephone network and on leased telephone type circuits".
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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this and other related ETSs, the following definitions apply:
answer mode: When calls are established with automatic facilities, a standard answer mode is 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
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 is necessary.
built-in modem: A functionally separate internal modem which is mechanically combined with a terminal.
call mode: When calls are established with automatic facilities, a standard call mode is 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, a bilateral agreement on
the use of call mode and answer mode is 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
suitable device may monitor or generate such signals.
integrated modem: An internal modem which is functionally and physically merged with the terminal.
internal modem: A modem which is physically incorporated in a terminal equipment and which takes its
electrical power supply from the terminal.
Different types of internal modems are defined: built-in, plug-in and integrated modems.
intra-character signalling rate: The intra-character signalling rate of a message is the signalling rate of
the start element and data elements within each character of this message.
modem: A functional unit that modulates and de-modulates signals in order to enable digital data to be
transmitted over analogue transmission facilities.
modem used for reference: A modem used for some of the tests specified herein or in a 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 is 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 [8]).
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 a modem specific ETS, that have an influence upon line signals
present at the PSTN interface.
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modes of use: Modes specified in a modem specific ETS, that have an influence upon conditions present
at a digital interface e.g. a "conventional" CCITT Recommendation V.24 [8] interface or a PC bus interface
in the case of an integrated modem.
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