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
25、transition period: 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 existing national requirements, at the choice of t
26、he 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 operators to update their network. However, a nationa
27、l approval authority would have the facility of refusing the approval of terminal equipment, for which a certificate ofconformance to a NET had been issued, if the network were not yet compatible with the terminal equipment to be connected. 4.3 The following note is offered as guidance on the supply
28、 and connection of telecommunications equipment that has already been approved either before application of this NET or during the transition period. After the application date of this NET, that is, during and after the transition period, the supply and connection of equipment already approved to ea
29、rlier standards may continue unless the national authority terminates the validity of approvals to earlier standards for whatever reason. Figure 1 is a diagrammatic representation of the above points. 5 APPROVAL PROCEDURES Details of national type approval procedures are not contained within NETs, b
30、ut are decided by national Administrations. 6 REQUIREMENTS TO BE SATISFIED . The scope statement defines which types of equipment must meet the requirements of each NET. In addition, equipment may also have to satisfy the requirements in other NETs (as defined in their scope statements) or, in the a
31、bsence of harinonised NETs, one or more published national standards. In the absence of any requirements in other NETs or in published national standards, no additional tests may be sought by any approval authority in the countries whose Administration has signed the MOU. 7 LEGAL BASIS OF THIS INTRO
32、DUCTORY 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 86/361. IV NET 3 i- - CEPT NET*3*PART*L 88 2326434 0000173 4 (A) Conformance Testing Under old requirements - - - -
33、Under this NET Supply and Connection of Equipment Type- Approved before end of Transition Period . . . . . Data of Application of NET End of Transition Period FIGURE 1 i i ! NET 3 V CEPT NET*3*PART*L 88 M 2326434 OOOOL2 b = 8 SIGNATORIES OF THE MOU Austria Belgium Deiiinark Finland France F. R. Germ
34、any Greece Iceland Ireland Italy Luxem bourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdoin 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 withdrawal of a NET, will be decided by the Technical Recommend
35、ations Application Committee (TRAC) and notified through appropriate channels including publication in the EC Oficial Journal. Errors detected within the text of a NET, or difficulties experienced with the application of a NET, should be reported to the following address: The Director, Ofice of the
36、Secretariat, European Telecoinmunications Standards Institute, BP 52 F-06569 Valbonne Cedex The coininents will be considered and acted upon by TRAC cinder an approved modifications procedure. Public consultation will take place in respect of all but the most urgent modifications to this NET. 10 THI
37、S NET (NET 3, Part 1) 10.1 Adoption The content of NET 3, Part 1, was adopted by a meeting of the Technical Recommendations Application Coininittee (TRAC), on the basis of a CEPT Recommendation, on the 21 May 1988 in Edinburgh, United Kingdoin. Note - Part 1 of NET 3 which is the subject of this doc
38、ument covers only layers 1 and 2 aspects. Layer 3 aspects will be covered by Part 2 of NET 3 which is not yet published. Until such time as Part 2 of NET 3 is agreed, the national layer 3 requirements of the country in which type approval of the terininal equipment is sought shall apply. The source
39、of the national information may be found in the CEPT Yearbook on Approval Information for Telecommunications Terminal Equipment. 10.2 Scope This NET (NET 3, Part I) is an access NET which specifies the technical characteristics to be offered by terininal equipment at an interface to a public telecoi
40、ninunications network presented at an ISDN basic access point. The legal definition of the Scope of this NET is provided in the section entitled “Scope“ in the body of the NET. 10.3 Date of Application Transition Period. This NET applies from 1 October 1988 within those States represented in the lis
41、t of Signatories, subject to the 10.4 Transition Period for this NET This NET is subject to a transition period of one year from the date of application. After the expiry of the transition period on 30 September 1989 the only applicable standard for type approval purposes within the Scope will be th
42、is NET. VI NET 3 - - 7 0000173 CEPT NET*3*PART*L 8 = 2326414 TABLE OF CONTENTS Scope 1 1.1 1.2 1.3 1.4 1.5 1.6 I .7 2 2.1 2.2 3 3.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 3.2.6 General In trod ic t ion Configiirations at User Premises Relationship to other CEPT Attachment RecornmendationslNETs Testing an
43、d Approval Methodology Information to be provided by the Apparatus Supplier Test Support by the Apparatus Suppliers TES Test En virotimeni Safety and Electromagnetic Compatibility Safety Electromagnetic Compatibility (EMC) Layer 1 Requirements General Static Conformance Requirements Procediira1 Requ
44、irements Service Characteristics iModes of Operation Wiring Functional Characteristics Inteiface Procedures 3.2.6.1 D-channel Access 3.2.6.2 ActivationlDeactivation 3.2.6.3 Frame Alignment 3.2.7 Maintenance 3.2.8 Electrical Characteristics 3.2.9 Power Feeding 3.2.1 O Inteiface Connector and Contact
45、Assignments 4 Layer 2 Requirements 4.1 General 4.2 SAPS to be Suipported 4.3 TEI Administration 4.4 Layer 2 Response Time 4.5 Optional Procediires 4.6 Static Conformance Requirements 4.6.1 Service Characteristics 4.6.2 Fiirictional Characteristics 4.6.2. Frame Striicture 4.6.2.2 Elements of Procedur
46、e and Formats 4.6.2.3 Layer-to-Layer Cornmunication 4.6.2.4 Data Link Lriyer Parameters 4.6.3 Inteifrice Procediires 4.6.3.1 General 4.6.3.2 Unaclcnowledged Information Transfer 4.6.3.3 TEI ikfcinagement 4.6.3.4 Negoticltion of Data Link Layer Parameters . 4.6.3.5 Estciblishrnent/Release of Multiple
47、 Frame Operation 4.6.3.6 Informrrtion Transfer in Miiltijde Frame Operation Page 2 J 3 3 3 4 5 5 5 6 6 6 6 6 6 6 7 7 7 8 8 3 8 9 9. 10 10 II 11 11 11 12 12 12 12 I 12 13 13 13 14 14 15 15 15 16 16 17 17 18 , ” NET 3 1 CEPT NET*3*PART*L 88 2326434 0000374 T H 4.6.3 .I Re-estciblishment of iWiiltiplc
48、Fr.cirnc. Opereition 4.6.3.8 Handling qf Esceplion Conditions 4.6.3.9 Deitei Link Lriyer. Monitor. 4.6,3. IO Bcisic Access Deactivcition 18 18 19 19 5 Definitions and Abbreviations 19 6 References 19 Annex A-Test schedules Part I-Test schedule for layer 1 conforinance Part 2-Test schedule for layer
49、2 conforinance Appendix I-Example of Information to be Provided by the Apparatus Supplier Appendix 2-Test Report Format Appendix 3-Test Sequences to Perform Check of D-channel Access 20 20 49 77 78 81 2 NET 3 CEPT NET*3*PART*L 88 2326434 0000375 3 Scope In accordance with CCIT Recommendation 1.420 (1984) and CEPT Recommendations T/GSI 04-01, T/GSI 04-02/ I, T/GSI 04-02/2, this NET specifies the technical characteristics (interface electrical electrical characteris- tics, interface mechanics connector, pin assignment, TE connecting cord characteristi
