1、BRITISH STANDARD BS EN 50098-2:1996 Customer premises cabling for information technology Part 2: 2048 kbit/s ISDN primary access and leased line network interface The European Standard EN 50098-2:1996 has the status of a British Standard ICS 33.080BS EN 50098-2:1996 This British Standard, having bee
2、n prepared under the direction of the Telecommunications Assembly, was published under the authority of the Standards Board and comes into effect on 15 November 1996 BSI 10-1998 The following BSI references relate to the work on this standard: Committee reference TCT/7 Draft for comment 94/630206 DC
3、 ISBN 0 580 26412 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee TCT/7, Telecommunications Installation requirements, upon which the following bodies were represented: BR Telecommunications Ltd. British Approvals Board
4、 for Telecommunications British Telecommunications plc Department of Trade and Industry (Telecommunications and Posts Division) Electrical Contractors Association Electricity Association Energis Communications Ltd. Federation of the Electronics Industry Mercury Communications Limited National Commun
5、ications Union OFTEL (Office of Telecommunications) Telecommunications Industry Association Amendments issued since publication Amd. No. Date CommentsBS EN 50098-2:1996 BSI 10-1998 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 50098-2 5 List of
6、references Inside back coverBS EN 50098-2:1996 ii BSI 10-1998 National foreword This British Standard has been prepared by Technical Committee TCT/7 and is the English language version of EN50098-2:1996 Customer premises cabling for information technology Part2:2048Kbit/sISDN primary access and leas
7、ed line network interface, published by the European Committee for Electrotechnical Standardization (CENELEC). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a Britis
8、h Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred to Corresponding British Standard BS EN 50098 Customer premises cabling for information Technology EN 50098-1 BS EN 50098-1:1994 ISDN basic access EN 50173 BS EN 50173:1996 Information Technol
9、ogy Generic cabling systems EN 55022 BS EN 55022:1995 Limits and methods of measurement of radio disturbance characteristics of information technology equipment BS EN 60603 Connectors for frequencies below 3MHz for use with printed boards EN 60603-7 BS EN 60603-7:1993 Detail specification for connec
10、tors, 8-way, including fixed and free connectors with common mating features Summary of pages This document comprises a front cover, an inside front cover, pagesi and ii, theEN title page, pages2 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and ma
11、y have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50098-2 April 1996 UDC 33.080 Descriptors: Cabling topology, design requirements, ISDN primary access, requirements for cabling and componen
12、ts English version Customer premises cabling for information technology Part2:2048kbit/s ISDN primary access and leased line network interface Cblages dans les locaux des usagers pour les technologies de linformation Partie2: Cblage dinterface de rseaux pour lignes spcialises et accs au dbit primair
13、e RNIS 2048kbit/s Informationstechnische Verkabelung von Gebudekomplexen Teil2: 2048kbit/s ISDN-Primrmultiplexanschlu und Netzschnittstelle fr Mietleitungen This European Standard was approved by CENELEC on 1995-11-28. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations whi
14、ch stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European
15、 Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the
16、national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Nor
17、malisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1996 Copyright reserved to CENELEC members Ref. No. EN 50098-2:1996 EEN50098-2:1996 BSI 10-1998 2 Foreword This European Standard has been prepared by CENELEC TC215,
18、Electrotechnical aspects of telecommunications equipment. It has been developed with the co-operation of ETSI TM3 Architecture, Functional Requirements and Interfaces of Transmission Networks. The text of the draft was submitted to the formal vote and was approved by CENELEC as EN50098-2 on 1995-11-
19、28. The following dates were fixed: EN 50098-2covers customer premises cabling for connection of Integrated Services Digital Network (ISDN) primary access equipment. This standard is the second of a series of European standards for customer premises cabling. It specifies customer premises cabling fo
20、r the connection of customers premises equipment with2048kbit/s interfaces to ISDN primary access and leased lines. The requirements in this standard are derived from ETS300011 which is based upon ITU-T 1)I.431 (Blue Book, Volume III) and contains additional requirements as well as modifications ofI
21、TU-T I.431, and EN60603-7. The reader is referred to EN60950 and ETS300046-1 toETS300046-5 for general safety requirements (seeannexA). EN 50098-2 contains two informative annexesAand B. Other standards in the series are: EN 50098-1, Customer premises cabling for information technology Part1:ISDN ba
22、sic access. latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 1996-12-01 latest date by which national standards conflicting with the EN have to be withdrawn (dow) 1996-12-01 1) International Telecommunication
23、 Union Telecommunications Standardisation Sector (formerly CCITT)EN50098-2:1996 BSI 10-1998 3 Contents Page Foreword 2 Introduction 5 1 Scope 5 2 Normative references 5 3 Definitions 5 4 Abbreviations and symbols 5 4.1 Abbreviations 5 4.2 Symbols 6 5 Design requirements 6 5.1 General 6 5.2 Insertion
24、 loss 6 5.3 Power feeding 6 5.4 Electromagnetic environment 6 5.5 Spurs 6 5.6 Near-end crosstalk loss 6 6 Point-to-point configuration 7 7 Component requirements within dedicated ISDN cabling 8 7.1 General 8 7.2 Cables 8 7.3 Connectors 8 7.4 Cords 8 8 Implementation over generic cabling systems 8 8.
25、1 General 8 8.2 Connection of ISDN primary access to generic cabling 8 8.3 Requirements for ISDN primary access generic cabling adapters 10 9 Cabling qualification 10 9.1 General 10 9.2 Spurs 10 9.3 Cabling integrity 10 9.4 DC loop resistance 10 9.5 Insulation resistance 10 9.6 Insertion loss 10 9.7
26、 Characteristic impedance 10 Page Annex A (informative) Bibliography 11 Annex B (informative) Examples of maximum distances for specific common cables 11 Figure 1 Point-to-point configuration 7 Figure 2 NT location in a generic cabling system 9 Figure 3 Means of connection of ISDN primary access to
27、generic cabling 9 Table 1 Pin allocation of connecting hardware 10 Table B.1 Examples of recommended maximum distances for typical installations 114 blankEN 50098-2:1996 BSI 10-1998 5 Introduction This standard is intended for use by those designing, planning, procuring, installing or testing cablin
28、g for ISDN primary access within a customers premises. The design requirements are specified in clause5, the minimum requirements for the associated components are specified in clause7. 1 Scope This European standard specifies the design and configuration of customer premises cabling for the connect
29、ion of primary access ISDN equipment. It includes design requirements for ISDN primary access point-to-point configuration; cabling requirements for the installation of new cabling; criteria for the use of existing cabling; implementation of ISDN primary access on generic cabling systems according t
30、o EN50173. This standard applies to the customer premises cabling for the transmission of ISDN primary access signals as defined by ETS300011. The requirements in this standard also apply to the cabling between Open Network Provision2048kbit/s network interfaces and terminal equipment conforming to
31、ETS300248. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from 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 t
32、o or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 50098-1, Customer premises cabling for information technology Part1:ISDN basic acces
33、s. EN 50173, Information technology Generic cabling systems. EN 55022, Limits and methods of measurement of radio interference characteristics of information technology equipment (IEC/CISPR22:1993). EN 60603-7, Connectors for frequencies below3MHz for use with printed boards Part7:Detail specificati
34、on for connectors, 8 way, including fixed and free connectors with common mating features (IEC603-7:1990). ETS 300 011, Integrated Sevices Digital Network (ISDN) Primary rate user-network interface Layer1 specification and test principles. IEC 807-8, Rectangular connectors for frequencies below 3MHz
35、 Part8: Detail specifcation for connectors, four-signal contacts and earthing contacts for cable screen. 3 Definitions For the purposes of this standard the definitions of EN50098-1 and EN50173 apply, of which the following are repeated below. 3.1 cable unit a single assembly of one or more cable el
36、ements usually of the same type or category. The cable unit may have a screen NOTEA binder group is an example of a cable unit. 3.1.8 ofEN50173:1995 3.2 channel the end to end transmission path connecting any two pieces of application-specific equipment. Equipment cables and work area cables are inc
37、luded in the channel 3.1.13 of EN50173:1995 4 Abbreviations and symbols 4.1 Abbreviations BD Building distributor CD Campus distributor DC Direct current EMC Electromagnetic compatibility FD Floor distributor GC Generic cabling ISDN Integrated services digital network NEXT Near-end crosstalk loss NT
38、 Network termination PBX Private branch exchange TE Terminal equipmentEN 50098-2:1996 6 BSI 10-1998 4.2 Symbols 5 Design requirements 5.1 General Signals passing between the NT1/NT2 and TE or signals passing between the NT1 and NT2 are subject to attenuation, distortion and induced noise. These sign
39、als may also cause electromagnetic radiation. Cabling components (including extension cords, adapters, cross connect components, sockets, junction boxes etc.) and cable all contribute to these effects. 5.2 Insertion loss The insertion loss is measured from the NT1 to the TE, or from NT1 to NT2 at 1,
40、024MHz with 120W non-reactive source and load impedances. The maximum insertion loss shall not exceed 6dB. 5.3 Power feeding In some cases power can be supplied via the cabling from the TE to the NT1 or from the NT2 to the NT1. In these cases a separate pair dedicated for power feeding is required.
41、5.4 Electromagnetic environment The performance of the ISDN primary access may be degraded by interference from external sources of electromagnetic radiation (such as motors), and from electrical signals from other applications carried under the same cable sheath. These effects can be minimised by e
42、mploying good installation practice. The impulsive noise generated by circuits carrying, for instance, analogue telephone signals or some unbalanced data transmission, can cause interference with signals carried on the ISDN cabling. Interference by crosstalk can be limited by putting pairs or quads
43、for ISDN primary access in separate cables or cable units in the same cable. EMC, emission and immunity to interference from the environment, also has to be considered. EMC can be improved by screening, balancing of equipment, balance of cabling, filtering or a combination of these. Standards giving
44、 more specific advice on these matters will be developed. However, all equipment and systems shall meet the requirements of EMC standards. The current relevant standard for emission is EN55022, for immunity EN55105 is under preparation. 5.5 Spurs There shall be no spurs in the ISDN primary access ca
45、bling. 5.6 Near-end crosstalk loss The NEXT of the cabling shall be greater than 38dB at 1,0MHz, which provides an operating margin over the 25dB minimum theoretical system requirement at 1,0MHz (seeETS300011). cable Network Termination Dedicated cabling socket Dedicated cabling plug Generic cabling
46、 socket (i.e.telecommunications outlet) Generic cabling plugEN 50098-2:1996 BSI 10-1998 7 6 Point-to-point configuration The point-to-point configuration is illustrated inFigure 1. Figure 1 is also relevant for the connection of an NT1 to an NT2. The TE can be connected to the cabling in one of thre
47、e ways: via a plug at the end of a cord connected to the TE; hardwired e.g. by the use of insulation displacement connectors incorporated in the TE; via a socket within the TE. The insertion loss is measured over the distance d 1in Figure 1 and shall not be greater than specified in5.2. Maximum dist
48、ances achievable with common cables used in Europe can be found in Annex B. Two pairs shall be available for the transmit and receive circuits. It is recommended that the polarity of each wire be maintained throughout the length of the cabling to facilitate testing and more effective cable managemen
49、t. Figure 1 Point-to-point configurationEN 50098-2:1996 8 BSI 10-1998 7 Component requirements within dedicated ISDN cabling 7.1 General Cabling specifically designed to support ISDN primary rate services shall comprise components which meet the requirements of7.2, 7.3 and7.4. The implementation of ISDN primary rate applications over generic cabling in accordance with EN50173 is defined in clause8. 7.2 Cables 7.2.1 General Balanced cables (twisted pair or star quads) shall be used. The cable o
