1、- CEPT NET*22 92 U 2326434 0033334 T85 NET 22 First edition: 1992 TRAC TECHNICAL RECOMMENDATIONS APPLICATION COMMITTEE EUROPEAN TELECO MUNICATION STANDARD Attachments t ed Telephone Network (PSTN) ents Por 1200 bits per second d for use on the PSTN CEPT NETx22 92 2326434 0033335 933 NET 22 First edi
2、tion: 1992 EUROPEAN TELECOMMUNICATION STANDARD 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 Telephone: Facsimile: Telex: + 41 31 62 20 81 + 41 31 62 20 78 9 1 1089 CEPT CH Publi
3、shed by: CEPT Liaison Office Seilerstrasse 22 CH-3008 Bern CEPT NET*22 92 2326434 0033336 858 THE EUROPEAN CONFERENCE OF POSTAL AND TELECOMMUNICATIONS ADMINISTRATIONS (CEPT) Copyright 1992 the European Conference of Postal and Telecommunications Administrations (CEFT). II NET 22 NORMES EUROPENNES DE
4、 TLCOMMUNICATION It is recognized, in the field of telecommunications within Europe, that there is a need to create common European standards for telecommunications equipment. Such harmonization would among other things facilitate cooperation between telecommunications equipment manu- facturers and
5、public telecommunications network operators, create a marketplace which naturally transcends that of na- tional frontiers, enhance the efficiency of business and other communication across Europe to bring economic benefits, and help translate the vision of a united Europe into a working reality. In
6、1985 an initiative by the Conference of European Posts and Telecommunications Administrations (CEPT) re- sulted in the drafting of a Memorandum of Understanding (MOU) agreeing to the mutual recognition of results of tests of conformity to a technical specification which would be known as a Norme Eur
7、openne de Tlcommunication (or NET). A list of signatories to the MOU is shown at the end of this introductory text. The signatories represent telecommunica- tions Administrations in most countries in Western Europe, including EEC and EFA Administrations. In 1986 the European Community Council Direct
8、ive 86/361/EEC laid down the principles of the initial stage of the mutual recognition of type approval for telecommunications terminal equipment. The Directive imposes the obligation on EC Member States to implement the recognition of tests to common conformity specifications. 1 NETs 1.1 include: -
9、 - Guiding principles under which a NET is written are the need to ensure essential requirements are met. These user safety insofar as this requirement is not covered by other legal instruments (e.g. Directive 73/23/EEC) safety of employees of public telecommunications network operators insofar as t
10、his requirement is not covered by other legal instruments (e.g. Directive 73/23/EEC) protection of public telecommunications networks from harm intenvorking of terminal equipment, in justified cases - - 1.2 Each NET constitutes part of a series of NETs prepared in response to the MOU and the EC Dire
11、ctive 861361. 1.3 A NET details the requirements, and a specification of interface tests for conformance to those requirements, which a defined type of telecommunications terminai equipment is required to satisfy in order to obtain authorization for connec- tion of the equipment to a defined Europea
12、n telecommunications network. The NET also includes, where appropriate, re- quirements made necessary in a given State by historical network peculiarities. 1.4 The existence of a NET will make it possible for an accredited laboratory in a country whose Administration has signed the MOU, to carry out
13、 tests, specified in the NET, on terminal equipment submitted to it, and to issue a test report. On the basis of the report, a competent body may then issue a certificate of conformity to the NET. There may of course be cases where the laboratory itself is the competent certification authority. This
14、 certificate is then recognized as valid in all the other signatory countries, avoiding the need for the equipment to have to undergo the same tests over again each time approval is applied for in any of those countries. 1.5 The common reference point which a NET represents thus offers the opportuni
15、ty of substantially reducing the complexity, length and cost of approval formalities. The operators of public networks are required to make reference to relevant NETs in public supply contracts. Manufacturers are thereby enabled to compete on a more equal technical basis in the supply of terminal eq
16、uipment covered by NETs. 2 TYPES OF NET The majority of NETs falls into one of the two categories: access NETs and terminal NETs. (a) AccessNET Details of the technical characteristics (electrical, mechanical and access control protocol), to be offered by terminal equipment at the interface to a spe
17、cific public telecommunications network are covered in an “access NET. The objective of an access NET is to ensure no disturbance occurs to the network and to ensure intenvorking between network and terminal equipment so that calls can be routed successfully through the network (but without any guar
18、antee of terminal to terminal operation). Indeed, since an access NET may have to serve a number of terminal NETs and applications which have not even been envisaged at present, it is important for the content not to include anything which is particular to a specific terminal or otherwise inhibiting
19、 to new developments. NET 22 III CEPT NETx22 92 H 232b4L9 0033338 620 = (b) Terminal NET The objective of a terminal NET is to ensure the end-to-end compatibility of a defined telecommunication ser- vice. The terminal NET should include any requirements which must be added to the corresponding acces
20、s NET(s) to ensure end-to-end communication. 3 DATE OF APPLICATION The date of application of a NET is that date at which the NET is recognized as being applicable, in the signatory Administrations, for the purposes of type approval, under the terms of Directive 86/361/EEC. 4 TRANSITION PERIOD 4.1 w
21、hich there will be coexistence between the NET and any national requirements which relate to the Scope. The transition period commences at the date of application. The transition period is a period of flexibility during After the expiry of the transition period the only applicable standard within th
22、e Scope for type approval purposes will be that of the particular NET. The end of the transition period is fixed by TRAC as an objective for all signatory countries of the MOU. In some cases, however, for example when a new network has to be set up, all network operators may not be in a position to
23、meet the objective. In such cases, the end of the transition period will be a date which is individual to the given country, and Administrations will publish the projected date by which the end of the transition period can be achieved. 4.2 transition period: The following notes are offered as guidan
24、ce on conformance testing of telecommunications equipment during the During the transition period, new telecommunications equipment offered by manufacturers under the Scope of this NET may be tested at a certified laboratory located within the signatory countries, either under this NET or under the
25、exist- ing national requirements, at the choice of the manufacturer. Testing under the NET rather than under the old requirements might offer the manufacturer the opportunity of a larger marketplace in which to sell the equipment. The transition period is also an opportunity for the public network o
26、perators to update their network. However, a national approval authority would have the facility of refusing the approval of terminal equipment, for which a certificate of conformance to a NET had been issued, if the network were not yet compatible with the terminal equipment to be con- nected. 4.3
27、already been approved either before application of this NET or during the transition period. The following note is offered as guidance on the supply and connection of telecommunications equipment that has After the application date of this NET, that is, during and after the transition period, the su
28、pply and connection of equipment already approved to earlier standards may continue unless the national authority terminates the validity of approvals to earlier standards for whatever reason. Figure 1 is a diagnammatic representation of the above points. 5 APPROVAL PROCEDURES Details of national ty
29、pe approval procedures are not contained within NETs, but are decided by national Adminis- trations. 6 REQUIREMENTS TO BE SATISFIED The scope statement defines which types of equipment must meet the requirements of each NET. In addition, equip- ment may also have to satisfy the requirements in other
30、 NETs (as defined in their scope statements) or, in the absence of hannonised NETs, one or more published national standards. In the absence of any requirements in other NETs or in pub- lished national standards, no additional tests may be sought by any approval authority in the countries whose Admi
31、nistra- tion has signed the MOU. 7 LEGAL BASIS OF THIS INTRODUCTION TEXT This introductory text is provided for guidance, and to aid interpretation. Readers are advised that the legally binding document in the EC countries is the EEC Directive 861361. IV NET 22 CEPT NET*22 92 = 2326414 0011339 567 (
32、A) Conformance Testing Under old requirements - - - - Under this NET _7 NET 22 V (6) Supply and Connection of Equipment Type- Approved before end - of Transition Period + I Data of Application of NET FIGURE 1 I End of Transition Period - CEPT NETx22 92 2326434 0011340 289 8 SIGNATORIES OF THE MOU Au
33、stria Belgium Denmark Finland France F. R. Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom 9 AMENDMENTS TO A NET There may in the future be a need for amendments to a NET. Any amendments to a NET, or suspension or with- drawal of a
34、NET, will be decided by the Technical Recommendations Application Committee (TRAC) and notified through appropriate channels including publication in the EC Official Journal. Errors detected within the text of a NET, or difficulties experienced with the application of a NET, should be reported to th
35、e following address: The Director, Office of the Secretariat, European Telecommunications Standards Institute, BP 52 F-O6569 Valbonne Cedex The comments will be considered and acted upon by TRAC under an approved modifications procedure. Public consultation will take place in respect of all but the
36、most urgent modifications to this NET. 10 THIS NET (NET 22) 10.1 Adoption (TRAC), on the basis of an ETSETSI, on the 2 October 1991, Rhodes, Greece. The content of NET 22 was adopted by a meeting of the Technical Recommendations Application Committee 10.2 Date of Application tion period. This NET ap
37、plies from 1 April 1992 within those States represented in the list of signatories, subject to the transi- 10.3 period on 31 March 1993 the only applicable standard for type approval purposes within the Scope will be this NET. Transition Period for this NET This NET is subject to a transition period
38、 of one year from the date of application. After the expiry of the transition VI NET 22 Foreword 1 2 3 3.1 3.2 4 4.1 4.2 4.2.1 4.2.2 5 5.1 5.2 5.3 5.3.1 5.3.2 5.3.2.1 5.3.2.2 5.3.3 5.4 5.5 5.6 5.7 5.7.1 5.7.2 5.8 5.8.1 5.8.1.1 5.8.1.2 5.8.1.3 5.8.2 5.8.2.1 5.8.2.2 5.9 5.10 5.11 5.11.1 5.11.2 5.12 CE
39、PT NET*22 92 23264LY OOLL34L 115 TABLE OF CONTENTS Scope Normative references Definitions and abbreviations Definitions and abbreviations Abbreviations General requirements References to other ETSs or NETS Information to be provided by the applicant Information required for testing purposes Instruct
40、ions for use Functional requirements specific to category II modems General requirements Modes Line signals Carrier frequencies Guard tone Guard tone - call mode modem Guard tone - answer mode modem Transmitted spectrum Line signalling rates Encoding and decoding of data Threshold of received line s
41、ignal detection Channel allocation Channel selection Automatic channel selection Hand-shaking sequences Auto-calling and auto-answering procedures Auto-calling - calling tone Auto-calling - recognition of answering tone Auto-answering Start-up procedures Call mode modem Answer mode modem Transmissio
42、n of start-stop characters Scrambler and descrambler Test loop 2 Instigation of a remote loop 2 Termination of a remote loop 2 Receiver performance Annex A (normative): Testing methods A. 1 General testing conditions A.l.l General notes A.1.2 A. 1.3 A.1.3.1 Introduction A. 1.3.2 General rules A.1.3.
43、3 Specific rules A.2 A.2.1 A.2.2 A.2.3 A.2.4 A.3 Proposed order for performing the tests Limitation of number of tesis Test for subclause 5.3.1 (carrier frequencies) Test for subclause 5.3.1 using the MCT Test for modems where the scrambler can be inhibited Tests for modems where test points are acc
44、essible Test for modems where neither A.2.2 nor A.2.3 applies Test for subclause 5.3.2 (guard tone) Page 3 4 4 4 4 5 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 8 8 8 8 8 8 8 8 9 9 9 9 9 10 10 10 10 10 10 11 11 11 11 11 11 12 12 NET 22 1 CEPT NETx22 92 2326434 0033342 051 A.3.1 A.3.2 A.4 A.5 A.6 A.7 A.7.1 A.7.2
45、 A.8 A.8.1 A.8.2 A.9 A.9.1 A.9.2 A. 10 A.lO.l A. 10.1.1 A. 10.1.2 A. 10.2 A.10.2.1 A. 10.2.2 Test for subclause 5.3.2.1 (guard tone, call mode modem) Test for subclause 5.3.2.2 (guard tone, answer mode modem) Test for subclause 5.4 (line signalling rates) Test for subclause 5.5 (encoding and decodin
46、g of data) Test for subclause 5.6 (threshold of received line signal detection) Test for subclause 5.7 (channel allocation) Test for subclause 5.7.1 (general) Test for subclause 5.7.2 (automatic channel selection) Test for subclause 5.8 (hand-shaking sequences) Call mode modem (CMM) Answer mode mode
47、m (AMM) Test for subclause 5.10 (scrambler and descrambler) Test for modems which can be operated in the synchronous mode of use Test for modems which can only be operated in a asynchronous mode of use Test for subclause 5.1 I (test loop 2) Instigation of remote test loop 2 Transmission of the test
48、loop initiation signal (controlling modem under test) Response to the test loop initiation signal (controlled modem under test ) Deactivation of remote test loop 2 Transmission of the de-activation signal(control1ing modem under test) Response to the de-activation signal (controlled modem under test
49、) Annex B (normative) : Derivation of timings Annex C (informative): Example proforma for the declaration of modes of operatioduse Annex D (informative) : Bibliography 12 12 12 12 12 13 13 13 13 13 14 14 14 14 15 15 15 15 15 15 15 17 18 20 2 NET 22 CEPT NET*22 92 2326434 0011343 T98 FOREWORD This ?Norme europenne des tlcommunications? (NET) has been produced by the Terminal Equipment (TE) Technical Committee of the European Telecommunications Standards Institute (ETSI). This NET contains the technical requirements for approval to Category II of 1200 bits per second duplex modems
