1、 IEC 61156-5 Edition 2.0 2012-12 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Horizontal floor wiring Sectional specification IEC 61156-5:2009/A1:2012(E) AMENDMENT 1
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9、r Service Centre: csciec.ch. IEC 61156-5 Edition 2.0 2012-12 INTERNATIONAL STANDARD Multicore and symmetrical pair/quad cables for digital communications Part 5: Symmetrical pair/quad cables with transmission characteristics up to 1 000 MHz Horizontal floor wiring Sectional specification INTERNATION
10、AL ELECTROTECHNICAL COMMISSION C ICS 33.120.20 PRICE CODE ISBN 978-2-83220-549-5 AMENDMENT 1 Registered trademark of the International Electrotechnical Commission Warning! Make sure that you obtained this publication from an authorized distributor. 2 61156-5 Amend. 1 IEC:2012(E) FOREWORD This amendm
11、ent has been prepared by subcommittee 46C: Wires and symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive components and accessories. The text of this amendment is based on the following documents: CDV Report on voting 46C/954/CDV 46
12、C/967/RVC Full information on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of this amendment and the base publication will remain unchanged until the stability date indicated on the IEC we
13、b site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. _ 6.2.2.2 Resistance unbalance between
14、 pairs Delete this subclause. 6.2.7 Transfer impedance Add the following new note after Table 2. NOTE The screen longitudinal d.c. resistance of 30 m /m or less is an indicator for fulfilling transfer impedance requirement of Grade 2. A measurement of d.c. resistance cannot replace a transfer impeda
15、nce measurement. 6.2.8 Coupling attenuation Replace the existing text of this subclause, including Table 3, by the following: Four types of performance are recognized for coupling attenuation. When measured using the absorbing clamp method (IEC 62153-4-5) or the triaxial method (IEC 62153-4-9), the
16、coupling attenuation in the frequency range from f = 30 MHz to 1 000 MHz shall meet the requirements indicated in Table 3. For screened cables, Type II is the minimum coupling attenuation requirement. 61156-5 Amend. 1 IEC:2012(E) 3 Table 3 Coupling attenuation Coupling attenuation type Frequency ran
17、ge MHz Coupling attenuation dB Type I 30 to 100 85 Type I 100 to 1 000 85 20 log10 (f /100) Type Ib 30 to 100 70 Type Ib 100 to 1 000 70 20 log10 (f /100) Type II 30 to 100 55 Type II 100 to 1 000 55 20 log10 (f /100) Type III 30 to 100 40 Type III 100 to 1 000 40 20 log10 (f /100) _ INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varemb PO Box 131 CH-1211 Geneva 20 Switzerland Tel: + 41 22 919 02 11 Fax: + 41 22 919 03 00 infoiec.ch www.iec.ch
