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1、BRITISH STANDARD BS 7630:1993 Generic specification for Symmetric pair/quad and multicore cables for digital communication (Implementation of CENELEC HD 608 S1) UDC 621.315.34:681.327.8 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Unc
2、ontrolled Copy, (c) BSI BS 7630:1993 This British Standard, having been prepared under the direction of the Electronic Components Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 April 1993 BSI 12-1999 The following BSI references relat
3、e to the work on this standard: Committee reference ECL/6 Draft announced in BSI News September 1992 ISBN 0 580 21935 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Components Standards Policy Committee (ECL/-) to Technical
4、 Committee ECL/6, upon which the following bodies were represented: British Cable Makers Confederation British Telecommunications plc EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) National Supervising Inspectorate Society of British Aerospace Companies Li
5、mited Telecommunications Cables Group of Bcmc Amendments issued since publication Amd. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 BSI 12-1999i Contents Page Committees responsi
6、bleInside front cover National forewordii Foreword2 Text of HD 608 S13 National annex NA (informative) Cross-referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 ii BSI 12-19
7、99 National foreword This British Standard has been prepared under the direction of the Electronic Components Standards Policy Committee. It is the implementation of the European Committee for Electrotechnical Standardization (CENELEC) Harmonization Document HD 608.S1:1992 Generic specification for
8、symmetric pair/quad and multicore cables for digital communication. 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 British Standard does not of itself confer immuni
9、ty from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the HD title page, pages 2 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will b
10、e indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI HARMONIZATION DOCUMENT DOCUMENT DHARMONISATION HARMONISIERUNGSDOKUMENT HD 608 S1 July 1992 UDC 621.3
11、15.34:681.327.8 Descriptors: Symmetric pair/quad multicore cables, digital communication English version Generic specification for symmetric pair/quad and multicore cables for digital communication Spcification gnrique pour cbles multiconducteurs paires symtriques et quartes pour transmission numriq
12、ue Fachgrundspezifikation fr mehradrige und symmetrische paar- /viererverseilte Kabel fr digitale Nachrichtenbertragung This Harmonization Document was approved by CENELEC on 1992-03-24. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
13、implementation of this Harmonization Document on a national level. Up-to-date lists and bibliographical references concerning national implementation may be obtained on application to the Central Secretariat or to any CENELEC member. This Harmonization Document exists in three official versions (Eng
14、lish, French, German). CENELEC members are the 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 Electr
15、otechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1992 Copyright reserved to CENELEC members Ref. No. HD 608 S1:1992 E Licensed Copy: London South Bank University, Londo
16、n South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 BSI 12-1999 2 Foreword Following a decision taken by CENELEC BTTF 61-7 at their meeting in Brussels on 1991-04-17, this document was submitted to the CENELEC Unique Acceptance Procedure (UAP) in July
17、 1991 for acceptance as a Harmonization Document. The text of the draft was approved by CENELEC as HD 608 S1 on 24 March 1992. The following dates were fixed: For products which have complied with the relevant national standard before 1993-03-01, as shown by the manufacturer or by a certification bo
18、dy, this previous standard may continue to apply for production until 1998-03-01. Contents Page Foreword2 Section 1. Guide to use 1.1Scope3 1.2Introduction3 1.3Installation considerations3 Section 2. Definitions and requirements 2.1General4 2.2Reference publications4 2.3Definitions4 2.4Materials and
19、 cable construction6 Section 3. Test methods 3.1General9 3.2Electrical tests9 3.3Transmission tests9 3.4Mechanical and dimensional measurement tests11 3.5Environmental tests12 Annex A Calibration of the impedance test set-up by means of scattering parameters13 Annex B14 Figure 1 Layout of cables15 F
20、igure 2 Test set-up for the measurement of unbalance attenuation of telecommunication installations15 latest date of announcement of the HD at national level(doa) 1992-09-01 latest date of publication of an identical national standard(dop) 1993-03-01 latest date of withdrawal of conflicting national
21、 standards(dow) 1993-03-01 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 BSI 12-19993 Section 1. Guide to use 1.1 Scope This Harmonization Document specifies requirements for indoor cables of mul
22、ticore, pair and quad construction used in digital communication systems such as Intergrated Services Digital Network (ISDN), local area networks and data communication systems. 1.2 Introduction The cables used for customer premises wiring are classified in the study of generic cabling for informati
23、on technology being produced by ISO/IEC JTC1/SC25/WG3. Parameters to be taken into consideration prior to the selection of a suitable cable are as follows: a) transmission method; b) cabling topology. 1.3 Installation considerations The cables have to be designed to meet the installation conditions
24、encountered for each area, see Figure 1, as follows: a) Equipment cables. The cables shall be suitable for use between work stations and peripheral equipment (e.g. printer). The cables shall be flexible and at the same time meet the required transmission characteristics for connection to digital equ
25、ipment. b) Work area cables. The cables shall be suitable for use between the work station and the communication outlets. They shall be flexible, lightweight and of small diameter and at the same time meet the required transmission and mechanical characteristics. c) Horizontal floor wiring cables. T
26、he cables shall be suitable for use between the work area communication outlet and the communication closet. The cables may be installed in ducts, trunking and in floor and ceiling cavities. The cables shall have acceptable performance under fire hazard conditions. d) Riser cables. The cables shall
27、be suitable for installation vertically between floors and therefore are designed to have adequate mechanical strength and acceptable performance under fire hazard conditions. e) Campus cables. These cables are used to interconnect buildings and shall be suitable for outdoor installation. The cables
28、 shall be sheathed and protected in accordance with IEC Publication 708-1. NOTEThe work area and equipment cables normally require suitable connectors at one or both ends. The type of connectors do not form part of this specification. Licensed Copy: London South Bank University, London South Bank Un
29、iversity, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 4 BSI 12-1999 Section 2. Definitions and requirements 2.1 General This section of HD 608 specifies the definitions and requirements of multicore, symmetrical pair and quad cables to be used in digital communication
30、 systems such as ISDN, local area networks and for data communication systems. 2.2 Reference publications 2.2.1 CENELEC or IEC HD 323, Basic environmental testing procedures. HD 405.1, Tests on electric cables under fire conditions Part 1: Tests on a single vertical insulated wire or cable. HD 405.2
31、, Part 2: Tests on a single small vertical insulated wire or cable. HD 405.3, Part 3: Tests on bunched wires or cables. HD 505.1.1, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section 1: Measurement of thickness and overall di
32、mensions tests for determining the mechanical properties. HD 505.1.2, Part 1: Methods for general application Section 2: Thermal ageing methods. HD 505.1.3, Part 1: Methods for general application Section 3: Method of determining the density water absorption tests shrinkage test. HD 505.1.4, Part 1:
33、 Methods for general application Section 4: Test at low temperature. HD 505.3.1, Part 3: Methods specific to PVC compounds Section 1: pressure at high temperature tests for resistance to cracking. HD 505.4.1, Part 4: Methods specific to polyethylene and polypropylene compounds Section 1: Resistance
34、to environmental stress cracking wrapping test after thermal ageing in air measurement of the melt flow index carbon black and/or mineral content measurement in PE. HD 505.4.2, Part 4: Methods specific to polyethylene and polypropylene compounds Section 2: Elongation at break after preconditioning w
35、rapping test after thermal ageing in air measurement of mass increase long term stability test (Appendix A). Test method for copper catalyzed degradation (Appendix B). IEC 28, International Standard of resistance for copper. IEC 50, International electrotechnical vocabulary. IEC 96-1, Radio-frequenc
36、y cables Part 1: General requirements and measuring methods. IEC 189-1, Low-frequency cables and wires with PVC insulation and PVC sheath Part 1: General test and measuring methods. IEC 304, Standard colours for insulation for low-frequency cables and wires. IEC 344, Guide to the calculation of resi
37、stance of plain and coated copper conductors of low frequency cables and wires. IEC 708-1, Low-frequency cables with polyolefin insulation and moisture barrier sheath Part 1: General design details and requirements. IEC 754-1, Tests on gases evolved during combustion of electric cables Part 1: Deter
38、mination of the amount of halogen acid gas evolved during the combustion of polymeric materials taken from cables. IEC 794-1, Optical fibre cables Part 1: Generic specification. 2.2.2 CCITT Compendium of cable measurement methods Protection against interference K.10: Unbalance about earth of telecom
39、munication lines 2.2.3 IEC Draft Study of generic cabling for Information Technology by ISO/IEC JTC1/SC25/WG3 2.3 Definitions For the purposes of this standard the definitions given in IEC Publication 50 apply, together with the following. 2.3.1 resistance unbalance the resistance unbalance between
40、conductors of a pair or in the same side of a quad is defined as: where 2.3.2 pair or one side of a quad to earth capacitance unbalance The capacitance unbalance to earth of a pair or one side of a quad is defined as: where (Rmax Rmin)/(Rmax + Rmin) 100(1) Rmaxis the resistance, in ohms, for the con
41、ductor with the higher resistance value; Rminis the resistance, in ohms, for the conductor with the lower resistance value. C1 C2(2) C1is the capacitance between conductor a and conductor b with conductor b connected to all other conductors, to the screen and to earth; Licensed Copy: London South Ba
42、nk University, London South Bank University, Fri Dec 08 11:54:41 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7630:1993 BSI 12-19995 2.3.2.1 pair or one side of a quad to screen capacitance unbalance the capacitance unbalance to screen of a pair or one side of a quad is defined as: where 2.3.3 mutu
43、al capacitance of a pair the mutual capacitance of a pair (or with respect to the side of a quad) is defined as: where 2.3.4 velocity of propagation the velocity of propagation is defined as the velocity at which the signal propagates in the cable and is expressed in km/s. The velocity of propagatio
44、n is derived from the measurement of velocity ratio and a knowledge of the velocity of propagation in free space. The latter shall be taken as 299.778 km/s the velocity ratio is defined as the ratio of the velocity of propagation in the cable to the velocity of propagation in free space 2.3.5 attenu
45、ation constant the attenuation constant for 100 m lengths of cable where the cable impedance is matched to the impedance of the test equipment is defined as: where 2.3.6 unbalance attenuation the unbalance attenuation is defined as the logarithm of the ratio of the longitudinal to the transverse vol
46、tage induced in a pair. It is expressed in dB the unbalance attenuation may be determined from: where the transmission unbalance, T is obtained in accordance with Appendix A6 of IEC Publication 96-1 unbalance attenuation to earth, au expresses the margin of interference immunity of an installation w
47、ith respect to electromagnetic fields. The larger the value of au the greater is the immunity to interference 2.3.7 near-end crosstalk loss (NEXT) near-end crosstalk loss (NEXT) is defined as: where 2.3.8 far-end crosstalk loss (FEXT) input/output crosstalk loss (IO FEXT) is defined as: equal level
48、crosstalk loss (EL FEXT) is defined as: where C2is the capacitance between conductor b and conductor a with conductor a connected to all other conductors, to the screen and to earth. C1s C2s(3) C1sis the capacitance between conductor a and the screen. The remaining conductors may be floated or conne
49、cted to the centre of the balance transformer; C2sis the capacitance between conductor b and the screen. The remaining conductors may be floated or connected to the centre of the balance transformer. (C1 + C2)/2 C3/4(4) C1is the capacitance between conductor a and conductor b with conductor b connected to all other conductors, to the screen and to earth; C2is the capacitance between conductor b and conductor a with conductor a connected to all other conductors, to the screen and to earth; C3
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