1、 IEC/TR 62652 Edition 1.0 2010-03 TECHNICAL REPORT Effects of engaging and separating under electrical load on connector interfaces in cabling used to support IEEE 802.3af (power-over-ethernet) applications IEC/TR 62652:2010(E) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC
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10、22 919 02 11 Fax: +41 22 919 03 00 IEC/TR 62652 Edition 1.0 2010-03 TECHNICAL REPORT Effects of engaging and separating under electrical load on connector interfaces in cabling used to support IEEE 802.3af (power-over-ethernet) applications INTERNATIONAL ELECTROTECHNICAL COMMISSION U ICS 13.220.10 P
11、RICE CODE ISBN 2-8318-1087-3 Registered trademark of the International Electrotechnical Commission colour inside 2 TR 62652 IEC:2010(E) CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references .7 3 Abbreviations .7 4 General 8 5 Telecommunications industry information .8 6 Technical infor
12、mation .9 6.1 Electrical discharges .9 6.2 Surface plating. long and short term effects.10 6.3 IEEE 802.3af Power-over-Ethernet environment (PoE) .11 6.4 Factors affecting the connector durability and definition of a nominal contact zone12 6.5 Acceptance criteria13 7 Test procedures, test set-up des
13、cription and results.14 7.1 General .14 7.2 Tests 1A and 2A Evaluation of the mechanical damage15 7.3 Tests 3A15 7.4 Test 4A Comparison of different IEC 60603-7 connectors.17 7.4.1 General .17 7.4.2 Tests Visual inspection of contacts.17 7.4.3 Results and observations to test 4A.17 7.5 Test 5A Resis
14、tive test setup simulating PoE power stress 19 7.5.1 General .19 7.5.2 Test setup .19 7.5.3 Tests Visal inspection of contacts.19 7.5.4 Results and observations to test 5A.19 7.6 Test 6A Engaging and separating with IEEE 802.3af hardware.20 7.6.1 PoE hardware20 7.6.2 Tests Visual inspection of conta
15、cts.21 7.6.3 Results Test 6A 21 7.7 Test 7A and 8A Effect of speed of contact separation.22 7.8 Tests 9A, 10A and 11A Effect of the cord length.22 7.9 Test 12A Effect of polarity 23 7.10 Test 13 A Investigation of IEC 60603-7-7 or IEC 61076-3-110 connecting hardware.24 7.11 Tests 14A and 15 A. 100 m
16、 long cable test25 8 Conclusions26 9 Future work 26 Bibliography28 Figure 1 Illustration of a typical shielded 8-way connector according IEC 60603-7 .9 Figure 2 Illustration of an IEC 60603-7-7 or IEC 61076-3-110 connector9 Figure 3 Connecting hardware contacts .10 Figure 4 Endspan PSE Alternative A
17、 according to IEEE 802.3af .11 TR 62652 IEC:2010(E) 3 Figure 5 Midspan PSE Alternative B according to IEEE 802.3af11 Figure 6 Cables used in the study12 Figure 7 Illustration of contact engaging cycle13 Figure 8 Illustration of a nominal contact area concept.13 Figure 9 Illustration of a low level c
18、ontact resistance (bulk) test.14 Figure 10 IEC 60603-7-7 connector contacts .15 Figure 11 Test circuit A16 Figure 12 Test results of tests 1A and 3A.16 Figure 13 Test circuit B17 Figure 14 Damage due to electrical discharges18 Figure 15 Test 4A Changes in LLCR .18 Figure 16 Test circuit C19 Figure 1
19、7 Test 5A observations .20 Figure 18 Test 5A results show little change in LLCR.20 Figure 19 Test circuit D21 Figure 20 Test results test 6A 21 Figure 21 Test circuit E22 Figure 22 LLCR (bulk) change .22 Figure 23 Test circuit F 23 Figure 24 Test 12A Observed minor damage to the plug connector surfa
20、ce 24 Figure 25 Discharge effects for the IEC 60603-7-7 connector 25 Figure 26 Test results test 13A 25 Figure 27 Change in the LLCR due to electrical and mechanical discharge for IEC 60603-7 connectors including 2 m, 10 m, and 100 m cables combined.26 Table 1 Some factors affecting the connecting h
21、ardware durability 12 Table 2 Selected parameters of the test set up and procedures .14 4 TR 62652 IEC:2010(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EFFECTS OF ENGAGING AND SEPARATING UNDER ELECTRICAL LOAD ON CONNECTOR INTERFACES IN CABLING USED TO SUPPORT IEEE 802.3af (POWER-OVER-ETHERNET) AP
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32、the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. Technical Report IEC 62652 has been prepared by subcommittee 48B: Connectors, of IEC technical committee 48: Electro
33、mechanical components and mechanical structures for electronic equipment. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. TR 62652 IEC:2010(E) 5 The text of this standard is based on the following documents: DTR Report on voting 48B/2076/DTR 48B/2146/RVC The comm
34、ittee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web 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 edit
35、ion, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore pr
36、int this document using a colour printer. 6 TR 62652 IEC:2010(E) INTRODUCTION The ISO/IEC/JTC1/SC25 subcommittee requested IEC SC 48B to prepare an engaging and separating under electrical load test method to be referenced in their standards. This test method standard was published as IEC 60512-9-3:
37、2006. The experts of SC 48B/WG5 were concerned about the effect of engaging/separating under electrical load on the IEC 60603-7 series connector interfaces that would be typically used in the IEEE 802.3af (PoE) applications. The experts developed a set of tests to evaluate the effects, the results o
38、f which are reported in this Technical Report. NOTE “Engaging” and “Separating” are terms used in most IEC TC 48 publications to describe the physical mating or un-mating of connectors. IEC 60050-581:1978, 581-08-08 1defines the terms as follows: engaging and separating force connector mating and un
39、mating force (deprecated) The force required to engage fully or separate a pair of mating components including the effect of a coupling, locking or similar device. The IEC 60603-7 series of standards use the terms mating and un-mating throughout. To avoid confusion in reading this Technical Report a
40、nd also the IEC 60603-7 series of standards, it is important to know that the term “engaging” is equivalent to “mating” and the term “separating” is equivalent to “un-mating”. 1IEC 60050-581:1978, International Electrotechnical Vocabulary Chapter 581: Electromechanical components for electronic equi
41、pment TR 62652 IEC:2010(E) 7 EFFECTS OF ENGAGING AND SEPARATING UNDER ELECTRICAL LOAD ON CONNECTOR INTERFACES IN CABLING USED TO SUPPORT IEEE 802.3af (POWER-OVER-ETHERNET) APPLICATIONS 1 Scope This Technical Report is intended to provide information on the effects of engaging and separating under el
42、ectrical load on the connector interfaces in cabling, used to support IEEE 802.3af (Power-over-Ethernet (PoE) applications. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For unda
43、ted references, the latest edition of the referenced document (including any amendments) applies. IEC 60512-9-3:2006, Connectors for electronic equipment Tests and measurements Part 9-3: Endurance tests Test 9c: Mechanical operation (engaging/separating) with electrical load IEC 60603-7, Connectors
44、for electronic equipment Part 7: Detail specification for 8-way, unshielded, free and fixed connectors IEC 60603-7-7, Connectors for electronic equipment Part 7-7: Detail specification for 8- way, shielded, free and fixed connectors, for data transmissions with frequencies up to 600 MHz IEC 61076-3-
45、110, Connectors for electronic equipment Product requirements Part 3-110: Detail specification for shielded, free and fixed connectors for data transmission with frequencies up to 1 000 MHz IEC 61156 (all parts), Multicore and symmetrical pair/quad cables for digital communications ISO/IEC 11801:200
46、2, Information technology Generic cabling for customer premises Amendment 1 (2008) IEEE 802.3af, “Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications Data Terminal Equipment (DTE) Power Via Media Dependent Interface (MDI),“ 3 Abbreviations
47、 For the purposes of this document the following abbreviations and special terms apply. IEEE The Institute of Electrical and Electronics Engineers LLCR Low-Level Contact Resistance S/FTP Acronym for a twisted pair cable with overall braid screened cable with foil screened balanced elements U/UTP Acr
48、onym for a twisted pair cable with no overall screen and unscreened balanced elements 8 TR 62652 IEC:2010(E) 4 General This Technical Report summarizes information on the effects of engaging and separating under electrical load on the connecting hardware in cabling used to support IEEE 802.3af (Powe
49、r-over-Ethernet (PoE) applications. It is intended to make the industry aware of possible problems utilizing modular connectors in applications with increasing power levels and to encourage further investigation of the effects of the connector engaging under electrical load. This report also includes information regarding test procedures and test results. It is not
