1、W 3404583 0044323 334 STAN DA RD ETS 300 047-4 August 1992 Source: ETSI TC-TE Reference: T/TE 04-35 UDC: Key words: ISDN, basic access, safety, protection Integrated Services Digital Network (ISDN); Basic access - safety and protection Part 4: Interface Ib - safety ETSI European Telecommunications S
2、tandards Institute ETSI Secretariat Postal address: 06921 Sophia Antipolis Cedex - FRANCE Office address: Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE Tel.: + 33 92 94 42 O0 - Fax: + 33 93 65 47 16 - Tlx: 470 040 F European Telecommunications Standards Institute 1 992. All rights reserv
3、ed. No part may be reproduced or used except as authorised by contract or other written permission. The copyright and the foregoing restiiction on reproduction and use extend to all media in which the information may be embodied. 3404583 0044874 163 W Page 2 ETS 300 047-4: 1992 Whilst every care has
4、 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 Standards Management Dept.“ at the address shown on the title page. Page 3 ETS 300 047-4: 1992 3404583 004487
5、5 OTT Contents Foreword . 5 1 Scope . 7 2 Normative references 7 3 Definitions and abbreviations 7 3.1 Definitions . 7 3.2 Abbreviations 7 4 Reference configuration . 7 5 Safety requirements and tests 7 General . 7 5.2 Test conditions 8 5.1 5.3 Touch current 8 Equipment without auxiliary interfaces
6、. 9 Equipment with auxiliary interfaces 9 5.3.1 5.3.2 Annex A (normative): . 12 Connection of PE conductor for equipment with multiple interfaces 12 Page 5 ETS 300 0474 1992 3404583 O044876 T3b W Foreword This European Telecommunication Standard (ETS) has been produced by the Terminal Equipment (TE)
7、 Technical Committee of the European Telecommunications Standards Institute (ETSI) in collaboration with members of the Business Telecommunications (BT) and Transmission and Multiplexing (TMI Technical Committees. This ETS aims to meet the urgent requirements of network operators and equipment manuf
8、acturers who are designing equipment to operate with the Integrated Services Digital Network (ISDN) basic access interface. This is the fourth part of a multipart ETS which comprises the following: ETS 300 047: “Integrated Services Digital Network (ISDN); Basic access - safety and protection“. ETS 3
9、00 047-1 (Part i): General. ETS 300 047-2 (Part 2): Interface I, - safety. ETS 300 047-3 (Part 3): Interface Ia - protection. ETS 300 047-4 (Part 4): Interface ib - safety. ETS 300 047-5 (Part 5): Interface ib - protection. Parts 2 to 5 of this ETS each cover one aspect of a specific equipment inter
10、face and are to be used in conjunction with Part 1 ll, which contains references and test circuits that are common to all parts of this ETS. The corresponding ETS for ISDN primary rate access is ETS 300 046 (“Integrated Services Digital Network (ISDN); Primary rate access - safety and protection“, P
11、arts 1 to 5). Previous page is blank W 3404583 0044877 972 - Page 7 ETS 300 047-4: 1992 1 Scope See Clause 1 of ETS 300 047-1 ill. This part of the ETS covers the safety requirements for interface ib of NT2. 2 Normative references This ETS incorporates by dated or undated reference, provisions from
12、other publications. These normative references are cited at the appropriate places in the text and the 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.
13、For undated references the latest edition of the publication referred to applies. EN 41003 131 and EN 60950 121 contain Special National Conditions and National A-deviations for some countries. Where these deviations apply to provisions that are referred to in this ETS, they shall apply to equipment
14、 complying with this ETS, intended for use in those countries. . ll 31 i41 i51 ETS 300 047-1 (1 992): “Integrated Services Digital Network (ISDN); Basic access - safety and protection - Part 1 : General“. EN 60950 (1988 including amendments 1 and 2): “Safety of information technology equipment, incl
15、uding electrically operated business machines“. EN 41 003 (1 991 1: “Particular electrical safety requirements for eqipment to be connected to telecommunication networks“. HD 384-5-54 (IEC 364-5-54): “Electrical installations of buildings - Earthing arrangements and protective conductors“. prHD 384-
16、7-707 S1 (IEC 364-7-707): “Electrical installations of buildings - Earthing requirements for the installation of data processing equipment“. 3 Definitions and abbreviations 3.1 Definitions For the purpose of this part of the ETS, the definitions given in subclause 3.1 of ETS 300 047-1 111 apply. How
17、ever, for the purposes of this part of the ETS, the Equipment Under Test (EUT) is a Network Termination (NT). 3.2 Abbreviations For the purpose of this part of the ETS, the abbreviations given in subclause 3.2 of ETS 300 047-1 i11 apply. 4 Reference configuration See Clause 4 of ETS 300 047-1 11 I.
18、5 Safety requirements and tests 5.1 General This Clause contains requirements for aspects of safety associated with connection to the ISDN basic access user-network interface to which an NT2 shall comply. The requirements are based on EN 60950 I21 and EN 41003 131. Previous page is blank 3404583 004
19、4878 809 Page 8 ETS 300 04741992 Interface lb shall comply with the requirements for accessible parts of an Safety Extra Low Voltage (SELV) circuit, however only two methods of separation from excessive voltages are permitted. These methods are: a) double or reinforced insulation according to subcla
20、use 2.3.4 of EN 60950 (21, and b) basic insulation plus protective earth screen according to subclause 2.3.5 of EN 60950 121. Subclause 4.4.2 of EN 41003 31 does not apply to interface tb The transmit and receive pairs of interface Ib are indicated in the figures by “t“ and “ri respectively. If ther
21、e are any Telecommunication Network Voltage (TNV) circuits in the EUT they shall comply with EN 41003 31 in all respects. 5.2 Test conditions See Clause 5 of ETS 300 047-1 111. In the figures of this ETS, the required surge generators, coupling networks and terminating networks are shown in outline.
22、 The figure numbers in those outlines refer to the figures in the annexes to ETS 300 047-1 11 1, as follows: - Annex C (normative): Coupling networks; - Annex E (normative): Measuring device for touch current. 5.3 Touch current If the connection point for an interface cable shield is connected to pr
23、otective earth, it shall not be connected to the measuring device during the tests, as shown in figures 1, 2 and 3. Page 9 ETS 300 047-4: 1992 D 3404583 0044879 745 D circuit si isolating 71f, 0 PE 1 transformer :; 5.3.1 Equipment without auxiliary interfaces I * EUT I Coupling network I 1- rl H fig
24、ure c.1 J Test circuit: figure 1. Test criterion: the weighted touch current measured across any Single interface ib shall not exceed 0,25 mA. The switch S shall be operated to find the higher result. ) I C*D bonding of common power or shield connection points to earth. The requirements that follow
25、depend on which method is chosen by the manufacturer. The manufacturer shall declare for test purposes which of the following methods is used to limit touch current: - - separation of interface I, from all auxiliary interfaces; bonding of common power or shield connection points to an earth potentia
26、l reference. m 3404583 0044880 467 m S 0,25 0,25 S 3,s 0,25 5 10 10 Page 10 ETS 300 047-4: 1992 No minim. See killet point A.2 In accordance with killet point A.3 In accordance with killet point A.4 In accordance with bullet point A.5 All pins, other than eaned pins, of each individual auxiliary int
27、erface shall be connected together in a manner appropriate to that interface, and then connected to the current limiting capacitor. Where it would be inappropriate to connect pins directly to each other, they shall be connected to individual capacitors which are in turn connected together; the total
28、 capacitance of such capacitors in parallel shall be the required 3,3 nF. Test circuit: figure 2 or 3 as appropriate. Test circuit switch S1: operated to find the higher result. Test circuit switch S2: see test criterion. Test criterion: theweighted touch current It measured across any single interf
29、ace ib shall be as follows: - if “separation“ is declared, s 0,25 mA with S2 closed; s 0,25 mA with S2 open; s 0,25 mA with S2 closed; any value with S2 open, but see table 1. - if “bonding“ is declared, If the equipment is to be permanently earthed in accordance with Annex A, bullet point A.5 of th
30、is part of the ETS, the test with S2 open is not carried out. If “bonding“ is declared, the manufacturer shall specify in the installation instructions the necessary minimum quality of connection to protective earth, depending on the measured value of It (see also annex A) and according to table 1,
31、Table 1 : Quality of connection to protective earth Minim quality of connection to protective earth (see Annex AI Page 11 ETS 300 047-4: 1992 m 3404583 004488L 3T3 - - c Measuring device flgure 1 Measuring device figure El - - 1) Auxiliary interfaces. 2) Connection point for interface cable shield,
32、if any. Figure 2: Touch current test circuit for mains powered equipment having auxiliary interfaces mains transformer I s2 PE -0 1 . 393 EUT w Coupling I nF- -33nF network I nFi I iio%T -210% .i i figure gg ;1 02 1 ) Auxiliary interfaces. 2) Connection point for interface cable shield, if any. Figu
33、re 3: Touch current test circuit for equipment having auxiliary interfaces, not mains powered 3404583 0044882 23T Page 12 ETS 300 0474:1992 -Annex A (normative): Connection of PE conductor for equipment with multiple interfaces A. 1 I A.2 A.3 A.4 A.5 If “bonding“ is declared by the manufacturer (see
34、 subclause 5.3.2) a minimum quality of connection to protective earth (PEI may be necessary. Four levels of quality, one of which has to be specified in the manufacturers installation instructions, are given in points A.2 to A.5 below. Which of the four levels is the minimum level for a particular e
35、quipment depends on the value of weighted touch current It measured during the tests in subclause 5.3.2 (see table 1). A higher quality of connection than that specified is acceptable. No installation requirements need to be specified for compliance with this ETS. However, protective earthing requir
36、ements may apply for other purposes. Connection via the PE conductor of the power supply cord according to EN 60950 21; or fixed connection via a separate PE conductor according to HD 384-5-54 (IEC 364-5-54) 41. Connection via the PE conductor of the power supply cord of pluggable equipment type B o
37、r permanently connected equipment as defined in EN 60950 121; or fixed connection via a separate PE conductor according to HD 384-5-54 (IEC 364-5-54) 41. Permanent connection according to EN 60950 121, HD 384-5-54 (IEC 364-5-54) I41 and prHD 384-7-707 S1 (IEC 364-7-707) 51; or fixed connection via a separate PE conductor according to HD 384-5-54 (IEC 364-5-54) 41 and prHD 384-7-707 S1 (IEC 364-7-707) 51. 3404583 0044883 Lib = August 1992 Page 13 ETS 300 0474:1992 First Edition
