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1、PRE-STANDARD Multi-pair cables used in high bit rate digital access telecommunication networks Part 1: Outdoor cables P U B L I C L Y A V A I L A B L E S P E C I F I C A T I O N IEC/PAS 62255-1 Edition 1.0 2001-06 I N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S I O N Referenc
2、e number IEC/PAS 62255-1 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright Internat
3、ional Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- PRE-STANDARD Multi-pair cables used in high bit rate digital
4、access telecommunication networks Part 1: Outdoor cables P U B L I C L Y A V A I L A B L E S P E C I F I C A T I O N IEC/PAS 62255-1 Edition 1.0 2001-06 I N T E R N A T I O N A L E L E C T R O T E C H N I C A L C O M M I S S I O N Reference number IEC/PAS 62255-1 Copyright International Electrotechn
5、ical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 Copyright 2001, IEC CONTENTS 1SCOPE.5 1.1NORMATIVE REFERENCES5 1.2TERMINOLOGY
6、5 2GENERAL INFORMATION. .6 2.1GENERAL CABLE DESCRIPTION.6 2.2ENVIRONMENT AND PRODUCT SAFETY REQUIREMENT. 6 2.3TESTING.6 3REQUIREMENTS FOR CONDUCTOR.6 3.1CONSTRUCTION AND DIMENSIONS6 3.2MECHANICAL REQUIREMENTS6 3.3ELECTRICAL REQUIREMENTS. 6 3.3.1Conductor resistance 6 3.3.2Conductor resistance unbala
7、nce7 4REQUIREMENTS FOR INSULATION7 4.1CONSTRUCTION MATERIAL AND DIMENSIONS7 4.1.1Colour code 7 4.2MECHANICAL REQUIREMENTS7 4.3ELECTRICAL REQUIREMENTS. 7 4.3.1Insulation resistance .7 5REQUIREMENTS FOR CABLE ELEMENT.7 5.1CONSTRUCTION AND DIMENSIONS7 5.1.1Screening of the cable element 7 5.1.2Spare ca
8、ble elements.8 6REQUIREMENTS FOR CABLE CORE.8 6.1DESIGN.8 6.1.1Interstitial fillers.8 7REQUIREMENTS FOR FILLING COMPOUNDS 8 7.1.1Moisture barriers8 8REQUIREMENTS FOR THE SCREENING OF THE CABLE CORE 8 9REQUIREMENTS FOR THE SHEATH.8 9.1COLOUR OF SHEATH9 9.2MECHANICAL REQUIREMENTS9 10IDENTIFICATION9 10
9、.1CABLE MARKING.9 11REQUIREMENTS FOR FINISHED CABLE9 11.1MECHANICAL REQUIREMENTS9 11.2ENVIRONMENTAL REQUIREMENTS9 11.2.1Temperature range9 11.2.2Fauna proofing .9 11.2.3Moisture barriers9 12ELECTRICAL REQUIREMENTS9 12.1DIELECTRIC STRENGTH.9 12.2MUTUAL CAPACITANCE.9 12.3CAPACITANCE UNBALANCE.9 12.4VE
10、LOCITY OF PROPAGATION10 12.5ATTENUATION10 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- C
11、opyright 2001, IEC 3 12.6LONGITUDINAL CONVERSION LOSS (LCL) 10 12.7NEAR END CROSSTALK (NEXT)10 12.8EQUAL LEVEL FAR-END CROSSTALK (ELFEXT).10 12.9POWER SUM (PS) OF CROSSTALK LOSS.11 12.10CHARACTERISTIC IMPEDANCE11 12.11COUPLING ATTENUATION 11 12.12TRANSFER IMPEDANCE 311 13PRODUCT QUALIFICATION REQUIR
12、EMENTS.11 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- 4 Copyright 2001, IEC INTERNATION
13、AL ELECTROTECHNICAL COMMISSION _ MULTI-PAIR CABLES USED IN HIGH BIT RATE DIGITAL ACCESS TELECOMMUNICATION NETWORKS Part 1: Outdoor cables FOREWORD A PAS is a technical specification not fulfilling the requirements for a standard, but made available to the public and established in an organization op
14、erating under given procedures. IEC-PAS 62255-1 has been processed by subcommittee 46C: Wires and symmetric cables, of IEC technical committee 46: Cables, wires, waveguides, RF connectors and accessories for communication and signalling. The text of this PAS is based on the following document: This
15、PAS was approved for publication by the P-members of the committee concerned as indicated in the following document: Draft PASReport on voting 46C/432/PAS46C/473/RVD Following publication of this PAS, the technical committee or subcommittee concerned will investigate the possibility of transforming
16、the PAS into an International Standard. 1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote international co- operation on all question
17、s concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in
18、 this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between
19、the two organizations. 2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested National Committees. 3)The documents produc
20、ed have the form of recommendations for international use and are published in the form of standards, technical specifications, technical reports or guides and they are accepted by the National Committees in that sense. 4)In order to promote international unification, IEC National Committees underta
21、ke to apply IEC International Standards transparently to the maximum extent possible in their national and regional standards. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5)The IEC provides no marking procedure
22、 to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with one of its standards. 6) Attention is drawn to the possibility that some of the elements of this PAS may be the subject of patent rights. The IEC shall not be held responsible for identif
23、ying any or all such patent rights. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyrig
24、ht 2001, IEC 5 MULTI-PAIR CABLES USED IN HIGH BIT RATE DIGITAL ACCESS TELECOMMUNICATION NETWORKS Part 1: Outdoor cables 1 Scope This specification defines outdoor multi-pair cables for use in high bit rate digital telecommunication networks with their relative definitions and requirements It covers
25、water tight cables, with an overall screen, characterised up to 30 MHz, to be used in outdoor networks (for example in the subscriber access loop). The electrical, mechanical, transmission performance characteristics of the screened cables, related to their reference test methods, are detailed. 1.1
26、Normative references This 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 cited publications are listed hereafter. For dated references, subsequent amendments to or revisions o
27、f these publications apply to this PAS only when incorporated in it by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. IEC 61156-1, Multicore and Symmetrical Pair/Quad Cables for Digital Communications :Part 1: Generic
28、 specification IEC 60028:1925, International standard of resistance for copper IEC 60050, International Electrotechnical Vocabulary (IEV) IEC 60068, Environmental testing IEC 60304:1982, Standard colours for insulation for low-frequency cables and wires IEC 60344:1980, Guide to the calculation of re
29、sistance of plain and coated copper con- ductors of low-frequency cables and wires IEC 60811-1, Common test methods for insulating and sheathing materials of electric cables - Part 1: Methods for general application IEC 60811-1-2:1985, Common test methods for insulating and sheathing materials of el
30、ectric cables - Part 1: Methods for general application - Section Two: Thermal ageing methods EN 50289: Communication cables Specifications for test methods (Series) EN 50290: Basic Reference Standard for Communication Cables (Series) 1.2 Terminology For the purpose of this PAS, the definitions of I
31、EC 61156-1 apply in addition to the following ones. Subscriber loop. Bit Rate ADSL Asymmetric Digital Subscriber Lines ATM Asynchronous Transfer Mode DSL Digital Subcriber Line EMC Electro-Magnetic Compatibility EMI Electro-Magnetic Interference FSAN Full Service Access Network HDSL High-bit-rate Di
32、gital Subscriber Lines ISDN Integrated Digital Services Network Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=IHS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without li
33、cense from IHS -,-,- 6 Copyright 2001, IEC ISDN-BRA ISDN Basic Rate Access ISDN-PRA ISDN Primary Rate Access Mbps Mega-bits per second TBD to be determined VDSL Very-high-bit-rate Digital Subscriber Lines xDSL Generic term referring to all DSLs, ISDN, HDSL, ADSL, VDSL, 2 General information 2.1 Gene
34、ral cable description These cables are designed for outdoor telecommunication networks, therefore they are water-tight cables Since these cables are specifically designed for new, various existing and emerging, telecommunication applications that involve high frequency spectrum up to 30 MHz, they in
35、clude an overall screen to improve the electromagnetic behaviour. These cables contain from one pair up to 150 pairs that can be either in pairs or quads. 2.2 Environment and product safety requirement 2.3 Testing For all test procedures described in this section, the test conditions shall be the st
36、andard atmospheric conditions (23 5 C, and 20-70 % relative humidity), unless otherwise stated. All measured and computed values are to be rounded to the number of decimal places given in the corresponding requirement. The parameters specified in this standard may be affected by measurement uncertai
37、nty arising either from measurement errors or calibration errors due to a lack of suitable standards. Acceptance criteria shall be interpreted with respect to this consideration. 3 REQUIREMENTS FOR CONDUCTOR 3.1 Construction and dimensions. The conductor shall consist of annealed copper, uniform in
38、quality and free from defects. The properties of the copper shall be in accordance with IEC 60028. The conductor shall be solid, circular in section. Normally the conductor shall be drawn in one piece. Joints in the conductor are permitted, provided that the tensile strength of a joint is not less t
39、han 85 % of the un-jointed solid conductor. The diameter of the conductor shall be between 0.4 mm to 0.8 mm. 3.2 Mechanical requirements. The conductor elongation at break shall be tested according to IEC 61156-1 subclause 3.4.2 and shall be between 15 and 20 % depending on the conductor size. 3.3 E
40、lectrical requirements. 3.3.1 Conductor resistance The conductor d.c. resistance, when measured according to IEC 61156-1 subclause 3.2.1 shall meet the values calculated in accordance with IEC 60344. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=I
41、HS Employees/1111111001, User=listmgr, listmgr Not for Resale, 03/05/2007 21:43:42 MSTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2001, IEC 7 3.3.2 Conductor resistance unbalance The conductor d.c. resistance unbalance, when measured according to IEC 61156-1 clau
42、se 3.2.2 shall be less than 2 % 4 REQUIREMENTS FOR INSULATION 4.1 Construction material and dimensions. Conductor insulation shall be composed of solid, cellular or composite (e.g. foam skin) polyolefin. The insulation shall be continuous, having a thickness as uniform as possible. The minimum thick
43、ness of the insulation shall be measured in accordance with the method specified in 2.2.1.1 of IEC 60189-1. The insulation shall be applied to fit closely to the conductor. The stripping properties of the insulation shall be checked in accordance with the method specified in 3.4 of IEC 60189-1. It s
44、hall be possible to strip the insulation from the conductor easily and without damage to the insulation or the conductor. When required the insulated conductors shall be coloured for identification. Colours shall correspond reasonably with the standard colours shown in IEC 60304. 4.1.1 Colour code T
45、he colour code shall be agreed between the customer and the manufacturer. 4.2 Mechanical requirements. Shrinkage of insulation shall be checked against IEC 61156-1 clause 3.5.1. The shrinkage shall be less than 5 % in the temperature range 40 C +70 C. 4.3 Electrical requirements. 4.3.1 Insulation re
46、sistance Insulation resistance IEC 61156-1 clause 3.2.45 000 Mohm.km under 500 V 5 REQUIREMENTS FOR CABLE ELEMENT 5.1 Construction and dimensions. The cable element is: - a pair consisting of two insulated conductors twisted together and designated wire “a“ and wire “b“, or - a quad consisting of fo
47、ur insulated conductors twisted together and designated wire “a“, wire “c“, wire “b“ and wire “d“ in order of rotation. The choice of the twist configuration (SZ or helical) and the maximum average length of lay in the finished cable shall be made with respect to the specified electrical requirement
48、s, handling performance and the pair or quad integrity NOTE - Forming the element with a variable lay can lead to the infrequent but acceptable occurrence of the maximum lay being longer than that may be specified. 5.1.1 Screening of the cable element Where a screen is required over the pair or quad, to improve the external and internal immunity, it may consist of the following: Copyright International Electrotechnical Commission Provided by IHS under license with