CEPT NET 3 PART 1 E-1988 Approval Requirements for Terminal Equipment to Connect to Integrated Services Digital Network (ISDN) Using ISDN Basic Access Part 1 (T TE 04-08E) Layers 1.pdf
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1、ICEPT r- NET -. NET 3 First edition: 1988 TRAC TECHNICAL RECOMMENDATIONS APPLICATION COMMITTEE EUROPEAN TELECOMMUNICATION STANDARD Approval requirements for terminal equipment to connect to integrated services digital network (ISDN) using ISDN basic access PART 1 : LAYERS 1 AND 2 ASPECTS Cotditiotis
2、 dcigrmetit poiir le raccorvlettietit diiti qiiil,ettietit terttritial aim rseaux tiuttriques iI ititgratioti cles servces (RNIS) utilisatit laccs de base RNIS Partie 1 : cispests cies tiivcaiis 1 et 2 CEPT NET*3*PART*L 88 2326434 0000168 4 NET 3 First edition: 1988 EUROPEAN TELECOMMUNICATION STANDA
3、RD Approval requirements for terminal equipment to connect to integrated services digital network (ISDN) using ISDN basic access PART 1: LAYERS 1 AND 2 ASPECTS Conditions dagrment porn le raccordement dun quipement terminal nux rseaux numriques a intgration des services (RNIS) utilisant laccs de bas
4、e RNIS Partie 1; aspects des nivenux 1 et 2 Published by : CEPT Liaison OfSice Seilerstrnsse 22 CH-3008 Bern Telephone Facsimile: Telex: 911089 CEPT CH + 41 31 62 20 81 + 41 31 62 20 78 _. _ - - r , / 7 CEPT NET*3*PART*L 88 h 232b434 OOOOLbqb NORMES EUROPENNES DE TLCOMMUNICATION It is recognized, in
5、 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 manufacturers and public telecommunications network opera
6、tors, create a marketplace which naturally transcends that of national 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 1985 an initiative by the Conference of E
7、uropean Posts and Telecommunications Administrations (CEPT) resulted 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 Europenne de Tlcommunication (or NET). A list
8、of signatories to the MOU is shown at the end of this introductory text. The signatories represent telecommunications Administrations in most countries in Western Europe, including EEC and EFTA administrations. In 1986 the European Community Council Directive 86/361/EEC laid down the principles of t
9、he 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 I. 1 include: - - Guiding principles under which a NET is
10、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 this requirement is not covered by other leg
11、al instruments (e.g. Directive 73/23/EEC) protection of public telecommunications networks from harm interworking 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 Directive 86/361. i .3 A NET details the requir
12、ements, and a specification of interface tests for conformance to those requirements, which a defined type of telecommunication terminal equipment is required to satisfy in order to obtain authorisation for connection of the equipment to a defined European telecommunications network. The NET also in
13、cludes, where appro- priate, requirements 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 tests, specified in the NET, on terminal equ
14、ipment 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 certificate is then recognized as valid in a
15、ll 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. I .5 The common reference point which a NET represents thus offers the opportunity of substantially reducing the complexity,
16、 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 equipment covered by NETs. 2 TYPES OF NET The
17、majority of NETs falls into one of the two categories: access NETs and terminal NETs. (a) Access NET Details of the technical characteristics (electrical, mechanical and access control protocol), to be offered by terminal equipment at the interface to a specific public telecommunications network are
18、 covered in an “access NET”. The objective of an access NET is to ensure no disturbance occurs to the network and to ensure interworking between network and terminal equipment so that calls can be routed successfully through the network (but without any guarantee of terminal to terminal operation).
19、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 to new developments. CEPT NET*3*PART*L 88
20、 E 2326434 O000370 2 E (b) Terminal NET The objective of a terminal NET is to ensure the end-to-end compatibility of a defined telecommunication service. The terminal NET should include any requirements which must be added to the corresponding access NET(s) to ensure end-to-end communication. 3 DATE
21、 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,l The transition period commences at the date of appl
22、ication. The transition period is a period of flexibility during which there will be coexistence between the NET and any national requirements which relate to the Scope. After the expiry of the transition period the only applicable standard within the Scope for type approval purposes will be that of
23、 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 meet the objective. In such cases, the end of the
24、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 The following notes are offered as guidance on conformance testing of telecommunications equipment during the
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