1、REPORT ETR 034 September 1991 UDC: 621.395 Key words: approval requirements, complex apparatus Business Telecommunications (BT); Approval requirements for complex customer premises apparatus and installations connected to the Public ISDN (including principles for the application of the essential req
2、uirements to any apparatus) ETS I European Telecommunications Standards Institute ETSI Secretariat: B.P.152 , F - 06561 Valbonne Cedex . France TP. + 33 92 94 42 O0 TF. + 33 93 65 47 16 Tx. 47 O0 40 F 0 European Telecommunications Standards Institute 1991 , All rights reserved. No part may be reprod
3、uced or used except as authorised by contract or other written permission. The copyright and the foregoing restriction on reproduction and use extend to all media in which the information may be embodied. H 3Y04583 0067307 512 = Page 2 ETR 034: 199 1 Whilst every care has been taken in the preparati
4、on and publication of this document, errors in content, typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to “ETSI Standards Management Dept.“ at the address shown on the title page. W 3404583 00b7308 459 W Page 3 ETR 034: 1991 Executive summary Introd
5、uction This Technical Report has been prepared in response to a mandate from the European Commission. Its aim was to produce recommendations on the need and scope for European Telecommunications Standards (ETSs) intended as candidate Common Technical Regulations (CTRs) covering the approval requirem
6、ents for complex customer premises apparatus and installations to be connected to the public Integrated Services Digital Network (ISDN). Attempts to define complex apparatus to distinguish it from simple apparatus led to the following conclusions: Conclusions The set of principles being developed to
7、 apply the essential requirements to complex apparatus can be applied to any apparatus, and their use in this way will facilitate the application of the Directive. Distinctions between simple and complex apparatus are arbitrary and of no relevance in determining the common set of principles for the
8、application of the Directive to individual products. However, the way in which the common set of principles will be applied will be determined by the interfaces and functions of the apparatus under consideration, and, in the case of terminal CTRs, the contents of the terminal CTRs may be affected by
9、 the degree of complexity of the apparatus. This conclusion led to the following recommendations: Recommendation 1 - New CTR Terminal CTRs will need to allow the criteria to be applied to be determined by the functions and interfaces of the apparatus. Because of the narrow scope of NET 33 (NET = Nor
10、mes Europennes de Tlcommunications), an additional terminal CTR should be produced for telephony in apparatus with an ISDN interface but which is outside the scope of NET 33. Recommendation 2 - New CTR The structure and interrelationship of CTRs based on NETs needs to be reviewed in the light of the
11、 conclusions of this Technical Report. A new standard (CTR) should be produced to define the application of access and terminal CTRs to specific apparatus. This new standard (CTR) should be based on the principles recommended in this Report. The new standard (CTR), together with the access and termi
12、nal CTRs, will provide for the approval of both simple and complex apparatus. The report recommends that the standard should be based on the following principles: Principle 1 Apparatus with interfaces for direct connection to a public network shall meet the requirements of the appropriate CTR (e.g.
13、NETs 1, 2, 3 - interfaces for connection to leased lines; - interfaces for connection to transmission facilities not provided by a public network; - interfaces for connection to other apparatus with through connection functions; m 3404583 0067310 O07 m Page 5 ETR 034: 1 99 1 - interfaces for termina
14、ls designed for direct connection to a public switched network; - interfaces for terminals capable only of indirect connection to a public switched network. Principle 10 The manufacturer should declare the CTRs or national access standards or parts thereof that each interface has been designed to me
15、et. Where interfaces have not been designed for direct connection to the public network, the manufacturer should declare any voluntary standards or technical specifications that apply to the interfaces or identify what other apparatus can be connected to them. In addition, the following recommendati
16、ons are made: Recommendation 3 Procedures such as trials and observations need to be available as an alternative to normal testing in special circumstances. Recommendation 4 Provision needs to be made in the approval system to accommodate minor modifications early in the life cycle of an apparatus w
17、ithout it having to undergo full re-approval. Recommendation 5 Where national standards need to be used in conjunction with the proposed new European standard, carefully planned transitional arrangements are needed. Recommendation 6 Where already approved apparatus is modified in a way that may affe
18、ct the essential requirements, procedures should be introduced to permit such modifications to be approved with a minimum of retesting and without the need to retest interfaces that have already been approved. The Commissions mandate asked that installations as well as complex apparatus should be co
19、nsidered. Further clarification of the mandate indicated that there was concern about a number of different regulations additional to approval applying in different countries. A brief review of such regulations led to the following recommendations: Recommendation 7 Safety regulations to keep telecom
20、munications wiring and power wiring adequately separated should be maintained and should apply equally to the telecommunications and power industries. Recommendation 8 Regulations should not be introduced for the performance of wiring systems, although the development of voluntary standards should b
21、e encouraged. Recommendation 9 Good quality maintenance should be readily available for more complex apparatus. 3404583 00b73LL T43 Page 6 ETR 034:1991 Recommendation 1 O Where the public network operator has evidence of network harm caused by a customer apparatus, there should be a provision for in
22、spection by an authorised body. Because of the short timescale and the wide reaching implications of these conclusions and recommendations, a period for further comment and discussion may be appropriate. 3404583 O067332 8T Page 7 ETR 034: 1 99 1 Contents Executive summary . 3 Contents 7 Foreword . 9
23、 1 Introduction . 11 2 Application of the Directive 12 2.1 Introduction . 12 2.2 Scope of the Directive 12 2.2.1 Products 12 2.2.2 Networks or systems . 14 3 Definitions . 14 4 Definition of complex apparatus and scope of this report 15 5 Essential requirements . 17 5.1 User safety . 18 5.3 Electro-
24、Magnetic Compatibility . 18 Effective use of the radio frequency spectrum 18 5.7.1 Through-connecting functions . 19 5.7.2 Terminating functions 20 5.2 5.4 5.5 5.6 5.7 Safety of employees of public telecommunications network operators . 18 Protection of the public network from harm . 18 Interworking
25、 with the public telecommunications network 18 Interworking via the public telecommunications network in justified cases 19 6 General principles for the application of the essential requirements to apparatus 21 6.1 Interworking with the public network 21 Directly connected apparatus 21 public networ
26、k . 21 Principle 2: Test procedures . 22 Indirectly connected apparatus 23 public network . 23 6.1 . 1 6.1.1.1 Principle 1 : Interfaces directly connected to the 6.1.1.2 6.1.1.3 Principle 3: Leased lines 23 6.1.2.1 Principle 4: Interfaces not directly connected to the 6.1.2.2 Principle 5: Interfaces
27、 with public network call control/signalling functions but no Layer 1 connection to the public network 24 6.1.2 6.2 Interworking via the public network for justified cases . 25 Principle 6: Terminating function . 25 direct connection to the public network 26 Through connection performance in other c
28、onfigurations 27 6.3 Purposes of interfaces 28 6.4 Examples of the application of the principles 29 6.5 Structure of the new standard . 29 6.6 Additional issues 30 6.2.1 6.2.2 6.2.3 6.2.4 Principle 7: Through connecting function to a terminal suitable for Principle 8: Through connecting function to
29、a terminal not suitable for direct connection to the public network . 27 3404583 0067333 83b = Page 8 ETR 034: 199 1 6.6.1 Special arrangements . 30 6.6.3 Transitional arrangements . 30 6.6.2 Modifications early in the life cycle . 30 7 Other regulations 31 7.1 Current situation . 31 7.2 Harmonisati
30、on 32 7.3 Installation. Inspection and Connection 32 7.4 Safety . 32 7.5 Wiring Performance 33 7.6 Network Performance 33 7.7 Maintenance 34 7.8 Right to Inspect 34 7.9 Marking . 35 8 Related future issues . 35 8.1 New access standards . 35 8.2 Treatment of LANs . 35 8.3 Treatment of broadband servi
31、ces 35 8.4 Centrex and virtual private networks . 36 Bibliography 36 Annex A: Definition of essential requirements (Article 4 of Directive 91 /263/EEC) . 37 Annex B: Scope of the Directive (Article 1 of Directive 91 /263/EEC) 38 3404583 O067334 752 Page 9 ETR 034:1991 Foreword The aim of this ETSI T
32、echnical Report (ETR) was to define the approval requirements for complex customer premises apparatus and installations connected to the Public Integrated Services Digital Network (ISDN) and to recommend what functional standards work is needed. However, during the preparation of this ETR the scope
33、broadened for two reasons: - In practice complex apparatus is likely to have both ISDN and non-ISDN interfaces and so the approval requirements need also to include non-ISDN interfaces. - It was concluded that a new standard specifically for complex apparatus is not needed because distinctions betwe
34、en complex and simple apparatus are not of primary importance in approvals. Instead a new standard defining the application of the essential requirements (especially those contained in access and terminal CTRs) to any apparatus is proposed. This new standard will provide the basis for the approval o
35、f both simple and complex apparatus. Thus a large proportion of the contents of this ETR is relevant to any apparatus. ETRs are informative documents resulting from ETSI studies which are not appropriate for European Telecommunication Standard (ETSI or Interim - European Telecommunication Standard (
36、I-ETS) status. An ETR may be used to publish material which is either of an informative nature, relating to the use or application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or LETS. This ETR has been produced by the Business Telecommunications (BT) Te
37、chnical Committee of the European Telecommunications Standards Institute (ETSI). W 3404583 0067335 677 Page 11 ETR 034:1991 1 Introduction This ETR has been produced in response to the mandate (SOGT Doc 90/36) from the European Commission DG XIII. The report has been prepared by the ETSI Technical C
38、ommittee responsible for Business Telecommunications, which has been considering the subject area for the past year. The Report is based on the approach to “approvals“ taken in the Directive on “The approximation of the laws of member states concerning telecommunications terminal equipment, includin
39、g the mutual recognition of their conformity“ (91 /263/EEC) which is referred to subsequently as the “Directive“. Article 4 (see Annex A) of the Directive specifies the essential requirements that terminal equipment must satisfy. The requirements for complex apparatus and installations need special
40、consideration because; - the approach to approval standards (NETS) to date has been concerned mainly with simple apparatus, - many items of complex apparatus have through connecting capabilities that may require a different approach to determining compliance with the requirements from that for simpl
41、e apparatus, although there is no definition of exactly what is meant by simple apparatus, - the liberalisation of telecommunications in Europe and particular initiatives such as Open Network Provision (ONPI are expected to lead to increased use of complex apparatus in private networks in most count
42、ries, and - there have been complaints about significant differences in the requirements that have to be satisfied by complex apparatus and installations in different countries. Private networks can contain a variety of different types of complex apparatus. The most common type is the Private Branch
43、 Exchange (PBX) which in the case of ISDN is known as the ISPBX. Other types of apparatus include multiplexers, Local Area Networks (LANs), automatic call distributors, echo cancellers, signalling converters, and packet switches, and in the future broadband apparatus will also be used. This report b
44、egins by discussing the scope of the Directive in the context of complex apparatus and private networks. It then considers the problems of defining a complex apparatus and concludes that the real issue is the more general one of the application of approval standards to apparatus in general. It consi
45、ders the application of the essential requirements of the Directive to apparatus in general but with special emphasis on more complex apparatus and private networks. These considerations lead to a set of principies for the application of the essential requirements to apparatus and the identification
46、 of a number of additional issues that need to be considered. The report contains a brief survey of the other regulations that exist in certain European countries in addition to type approval, and discusses whether any additional regulations are necessary. The report also shows how these principles
47、can be applied in future to apparatus such as LANs and broadband apparatus, and considers the special case of Centrex and Virtual Private Networks. Recommendations are given for the preparation of additional standards. Because of the short timescale and the wide reaching implications of these conclu
48、sions and recommendations, a period for further comment and discussion may be appropriate. The objective of liberalising and harmonising the terminal equipment market cannot be achieved in isolation given the interrelationship between the terminal equipment and the public network. In order to achiev
49、e this objective, there needs also to be substantial harmonisation of the public network services as is proposed under ONP. However, given the extent of the differences in public networks and in the approach to regulation in different countries, harmonisation will inevitably take some time to achieve. Previous page is blank m 3404583 0067336 525 m Page 12 ETR 034: 199 1 The liberalisation of the terminal equipment market involves a reassignment of responsibility, with users having to accept responsibility for their apparatus, and the public network operator no longer being responsible for
