ETSI ETS 300 114 ed.1 (1991-10)

Attachments to the Public Switched Telephone Network (PSTN); Basic attachment requirements for modems standardized for use on the PSTN (Candidate NET 20)

T/TE 04-17 [AE]

Sredstva za javno komutirano telefonsko omrežje (PSTN) – Osnovne priključitvene zahteve za modeme, standardizirane za uporabo v PSTN

General Information

• Status: Published
• Publication Date: 22-Sep-1991
• Technical Committee: TE 5 - General Terminal Access Requirements
• Current Stage: 12 - Completion
• Due Date: 13-Jul-1990
• Completion Date: 23-Sep-1991
• Ref Project: SIST ETS 300 114 E1:2003 - Attachments to the Public Switched Telephone Network (PSTN); Basic attachment requirements for modems standardized for use on the PSTN (Candidate NET 20)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 114 E1:2003
01-december-2003
6UHGVWYD]DMDYQRNRPXWLUDQRWHOHIRQVNRRPUHåMH3671±2VQRYQHSULNOMXþLWYHQH
]DKWHYH]DPRGHPHVWDQGDUGL]LUDQH]DXSRUDERY3671
Attachments to the Public Switched Telephone Network (PSTN); Basic attachment
requirements for modems standardized for use on the PSTN (Candidate NET 20)
Ta slovenski standard je istoveten z: ETS 300 114 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 114 E1:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 114 E1:2003

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SIST ETS 300 114 E1:2003
EUROPEAN ETS 300 114
TELECOMMUNICATION October 1991
STANDARD
Source: Reference:
ICS:33.040.40
ETSI TC-TE, PSTN, Modems
Key words:
Attachments to the Public Switched Telephone Network (PSTN)
Basic attachment requirements for modems standardized for use
on the PSTN
(Candidate NET 20)
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 1991. 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 .10
3.1 Definitions .10
3.2 Abbreviations .11
4 Common requirements.12
4.1 General notes .12
4.2 PSTN access requirements.12
4.3 Information to be provided by the applicant.12
4.3.1 Information required for testing purposes .12
4.3.1.1 List of modes .12
4.3.1.2 Other items .12
4.3.2 Instructions for use.13
5 Requirements common to some Category II modems .13
5.1 General notes .13
5.2 Call establishment sequence based upon CCITT Recommendation V.25 [9].13
5.2.1 For modems initiating calls.13
5.2.2 For modems answering calls .14
5.3 Test loop implementation based upon CCITT Recommendation V.54 [11] .14
5.3.1 General.14
5.3.2 Remote digital test loop (loop 2).15
5.3.3 Local analogue test loop (loop 3) .15
5.4 Threshold of received line signal detection.15
5.5 Requirements for modems providing asynchronous to synchronous conversion based
upon CCITT Recommendation V.14 [8] .15
5.5.1 General.15
5.5.2 Transmission of start-stop characters.16
5.5.2.1 Signalling rate ranges of the start-stop characters at the
modem input.16
5.5.2.2 Start-stop character format.16
5.5.2.3 Asynchronous to synchronous conversion .16
5.5.2.3.1 Transmitter.17
5.5.2.3.2 Receiver.17
5.5.2.3.3 Break signal .17
5.6 Performance .18
5.6.1 Overall Performance .18
5.6.2 Performance in the presence of metering pulses .18
Annex A (Informative): Testing methods for national variants for Clause 2.20
A.1 General notes.20
Annex B (Normative): Testing methods for Clause 5 .21
B.1 General conditions for test .21
B.2 Tests of the call establishment sequence specified in subclause 5.2.21
B.2.1 For modems initiating calls .21
B.2.2 For modems answering calls.22

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B.3 Tests to verify the test loop implementation specified in subclause 5.3. 22
B.4 Tests to verify the threshold of line signal detection. 22
B.5 Tests to verify the process of asynchronous to synchronous conversion specified in subclause
5.5. 22
B.5.1 Test patterns . 23
B.5.1.1 General . 23
B.5.1.2 Standard test text. 23
B.5.1.3 Discrete Test Characters (DTC). 23
B.5.2 Data signalling rates. 24
B.5.3.1 Transmitter tests. 25
B.5.3.1.1 Omission of stop elements . 25
B.5.3.1.2 Over-speed and under-speed capabilities . 25
B.5.3.1.3 Arbitrary character spacing . 26
B.5.3.1.4 Break signal transmission. 27
B.5.3.2 Receiver tests. 27
B.5.3.2.1 Over-speed capability . 27
B.5.3.2.2 Under-speed capability . 28
B.5.3.2.3 Character recovery. 28
B.5.3.2.4 Break signal reception . 28
B.6 Performance testing methodology. 29
B.6.1 General. 29
B.6.2 Definitions. 29
B.6.4 Method of measurement . 30
B.6.4.1 Test set-up. 31
B.6.4.2 Test 1. 32
B.6.4.3 Test 2. 35
B.6.4.4 Test 3. 36
Annex C (Normative): Description of specialised test facilities . 37
C.1 General. 37
C.2. Test set-up. 37
C.2.1 Simulated PSTN conditions . 38
C.3 Test Line 1 transmission characteristics . 43
C.3.1. Local line simulators. 43
C.3.2 Trunk network simulator. 43
C.3.3 Permanent impairments. 43
C.3.3.1 Insertion loss. 43
C.3.3.2 White noise. 43
C.3.3.3 Frequency offset and Phase roll. 51
C.3.3.4 Phase jitter. 52
C.3.3.5 Echo. 52
C.3.3.6 Harmonic distortion. 52
C.4 Test Line 2 transmission characteristics . 52
C.4.1 Local line simulators. 52
C.4.2 Trunk network simulator. 60
C.4.3 Permanent impairments. 60
C.4.3.1 Insertion loss. 60
C.4.3.2 Frequency offset and Phase roll. 60
C.4.3.3 Phase jitter. 60
C.4.3.4 Echo. 60
C.4.3.5 Harmonic distortion. 61
C.4.3.6 Noise floor. 61
C.5 Test Line 3 transmission characteristics . 61
Annex D (Normative): Provision of test tools. 62

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Annex E (Informative): Example of proforma chart for information request.63
Annex F (Informative): Bibliography.64
History.65

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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). The text of this
draft ETS may be utilized, wholly or in part, for the establishment of NET 20.
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 Standard (Normative references, numbers [1] to [6] inclusive).
Approval as Category I is the minimum mandatory requirement for the connection of a modem to the
Public Switched Telephone Network (PSTN), although there may be other additional requirements. Any
modem is capable of Category I approval as long as it meets the PSTN access requirements of the
country, or countries, for which approval is sought. It does not have to comply, for instance, with any of the
CCITT V. series Recommendations, nor are there any approval requirements relating to its functioning or
its performance as a modem. A modem approved as Category I may or may not be in compliance with
certain CCITT Recommendations but, since this is not tested, no assurance of interworking is implied. All
of the requirements for Category I modems are given in this ETS which in turn references draft prETS 300
001 [1].
NOTE: Clause 4 of this ETS, specifying the common requirements for modems to be attached
to the PSTN, may reference significantly differing requirements, depending upon
peculiarities of the national networks.
Approval as category II, which is applicable only when the supplier requests, is only available to modems
providing certain combinations of functionality based upon the modem specific V. series of CCITT
Recommendations. The object of Category II approval is to provide the user with the assurance that a
modem can inter-work, under most network conditions, with other compatible Category II modems.
To obtain Category II approval a modem must, in addition to meeting requirements appropriate to
Category I modems, meet the requirements given in one or more modem-specific ETS (final draft prETS
300 002 [6] and ETSs 300 115 to 300 118 ([2] 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 CCITT 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 inter-
working and do not prevent Category II approval of a modem 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 is approvable to Category II in that
mode.
It is acceptable for a modem to be tested for Category II approval 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 requirements applicable to Category I modems. The "Instructions for Use" make it clear to the user
those modes which the modem has been approved as meeting the requirements for Category II and those
which meet requirements for Category I.
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

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for those using the modem and to ensure end-to-end interoperability between modems in compatible
configurations.
NOTE: Compliance with a modem specific ETS provides to the user the 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.

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1 Scope
This ETS specifies the technical characteristics to be met by modems seeking approval for connection to
the PSTN. Clauses of this ETS also define the approval criteria for certain features which may be provided
by some Category II modems, but the requirements in these parts are only mandatory 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 galvanically 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 and for Clause 5 in Annex B.
Annex C describes the testing facilities which a testing laboratory may need to provide.
Annex D 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] Draft prETS 300 001 (1990): "Attachments to Public Switched Telephone
Network (PSTN); General technical requirements for equipment connected to an
analogue subscriber interface in the PSTN (T/TE 04-16) [Candidate NET 4]".
[2] ETS 300 115 (1990): "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] ETS 300 116 (1990): "Attachments to the Public Switched Telephone Network
(PSTN); Category II attachment requirements for 1200 bits per second duplex
modems standardized for use on the PSTN [Candidate NET 22]".
[4] ETS 300 117 (1990): "Attachments to the Public Switched Telephone Network
(PSTN); Category II attachment requirements for 2400 bits per second duplex
modems standardized for use on the PSTN [Candidate NET 23]".
[5] ETS 300 118 (1990): "Attachments to the Public Switched Telephone Network
(PSTN); Category II requirements for 1200 bits per second half-duplex and
1200/75 bits per second asymmetrical duplex modems standardized for use on
the PSTN [Candidate NET 24]".
[6] Final draft prETS 300 002 (1991): "Public Switched Telephone Network (PSTN);
Approval requirements for 9600 or 4800 bits per second duplex modems
standardized for use on the PSTN (T/TE 04-09) [Candidate NET 25].
[7] CCITT Recommendation V.24 (1984): "List of definitions for interchange circuits
between Data Terminal Equipment and Data Circuit-Terminating Equipment".
[8] CCITT Recommendation V.14 (1988): "Transmission of start-stop characters
over synchronous bearer channels".

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[9] 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".
[10] CCITT Recommendation V.21 (1984): "300 bits per second duplex modem
standardized for use in the General Switched Telephone Network".
[11] CCITT Recommendation V.54 (1984): "Loop test devices for modems".
[12] CCITT Recommendation V.4 (1984): "General structure of signals of
international Alphabet No. 5 Code for data transmission over Public Telephone
Networks".
[13] 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".
[14] CCITT Recommendation V.52 (1984): "Characteristics of distortion and error-
rate measuring apparatus for data transmission".
[15] 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".
[16] 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".
[17] CCITT Recommendation V.23 (1984): "600/1200- Baud modem standardized
for use in the General Switched Telephone Network".
[18] 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.
3 Definitions and abbreviations
3.1 Definitions
For the purpose of this and other related ETSs, the following definitions apply:
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 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.
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 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, a bilateral agreement on
the use of call mode and answer mode shall be necessary.

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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.
Intracharacter signalling rate: the intracharacter 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 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 [7]).
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.
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 [7] interface or a PC bus interface
in the case of an integrated modem.
On-line state: 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 the on-line condition is potentially capable of sending or receiving
speech-band information to or from the network.
Plug-in modem: a physically and functionally separate internal modem which is interchangeable from a
terminal.
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 hand-shaking sequences.
3.2 Abbreviations
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

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DCE Data Circuit-Terminating Equipment
DTE Data Terminal Equipment
ETS European Telecommunications Standard
ETSI European Telecommunications Standards Institute
MCT Modem Conformance Tester
PSTN Public Switched Telephone Network
4 Common requirements
4.1 General notes
This Clause specifies the requirements to be met by all modems seeking Category I or Category II
approval for use on the PSTN.
4.2 PSTN access requirements
The requirements of Draft prETS 300 001 [1] apply.
4.3 Information to
...