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22、T OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. ANSI/TIA-1152 iii Requirements for Field Test Instruments and Measurements for Balanced Twisted-Pair Cabling TABLE OF CONTENTS 1 SCOPE . 1 2 NORMATIVE REFERENCES . 1 3 DEFINITIONS, ABBREVI
23、ATIONS AND ACRONYMS, UNITS OF MEASURE 1 3.1 General 1 3.2 Definitions 1 3.3 Acronyms and abbreviations . 2 3.4 Units of measure . 2 3.5 Variables 2 4 TEST INSTRUMENTS 3 4.1 General 3 4.2 Data reporting requirements . 3 4.2.1 Parameters to be reported . 3 4.2.2 Wire Map 3 4.2.3 Length 4 4.2.3.1 Physi
24、cal length vs. electrical length 4 4.2.3.2 NVP calibration . 5 4.2.4 Pass/fail results 5 4.2.5 Detailed results 6 4.2.6 Summary results 6 4.3 Field measurement procedures 10 4.3.1 Consistency checks for field testers 10 4.3.2 Administration 10 4.3.3 Test equipment connectors and cords . 10 4.4 Field
25、 tester measurement accuracy requirements 11 4.4.1 General 11 4.4.2 Nominal accuracy 11 4.4.3 Length, propagation delay, and delay skew performance parameters 13 4.4.4 Performance parameters for Level IIe field testers 14 4.4.5 Performance parameters for Level III field testers . 15 4.4.6 Performanc
26、e parameters for Level IIIe field testers . 17 4.5 Procedures for determining field tester parameters 20 4.5.1 General 20 4.5.2 Output signal balance (OSB) . 20 4.5.3 Common mode rejection (CMR) 21 4.5.4 Residual NEXT loss . 21 4.5.5 Dynamic accuracy 22 4.5.6 Source/load return loss 23 4.5.7 Random
27、noise floor 23 4.5.8 Residual FEXT loss . 24 4.5.9 Directivity . 25 4.5.10 Tracking . 25 4.5.11 Source match . 26 4.5.12 Return loss of remote termination 26 4.5.13 Constant error term of the length measurement function 26 4.5.14 Error constant proportional to length of the length measurement functi
28、on 26 4.5.15 Constant error term of the propagation delay measurement function . 26 4.5.16 Error constant of the proportional to propagation delay measurement function proportional to the propagation delay 27 4.5.17 Constant error term of the delay skew measurement function 27 ANSI/TIA-1152 iv 4.6 M
29、easurement error models . 27 4.6.1 General 27 4.6.2 Error model for the insertion loss measurement function 28 4.6.3 Error model for the NEXT loss measurement function 28 4.6.4 Error model for the PSNEXT loss measurement function . 29 4.6.5 Error model for the ACRF measurement function . 30 4.6.6 Er
30、ror model for the PSACRF measurement function 31 4.6.7 Error model for the return loss measurement function 33 4.6.8 Error model for the propagation delay measurement function 34 4.6.9 Error model for the delay skew measurement function . 34 4.6.10 Error model for the length measurement function . 3
31、4 4.7 Alien crosstalk measurement requirements and procedures 34 4.7.1 General 34 4.7.2 Frequency range 34 4.7.3 Test parameters . 35 4.7.4 Test configurations . 35 4.7.5 Test equipment for measuring alien crosstalk in installed cabling 35 4.7.6 Channel alien crosstalk testing 35 4.7.7 Permanent lin
32、k testing . 35 4.7.8 Alien crosstalk measurement floor . 36 4.7.9 Measurement floor of the test instrument for the channel test configuration. 36 4.7.10 Measurement floor of the test instrument with permanent link adapter test cords 37 4.7.11 Alien crosstalk measurements . 37 4.7.11.1 Measuring ANEX
33、T loss in the channel configuration . 37 4.7.11.2 Measuring AFEXT loss in the channel configuration 38 4.7.11.3 Measurement of permanent link alien crosstalk . 38 4.7.12 Processing measurement data 38 4.7.12.1 Significance condition testing . 38 4.7.12.2 Computing PSANEXT loss and PSAACRF 39 4.7.12.
34、3 Applying measurement floor correction 39 4.8 Comparison measurement procedures . 40 4.8.1 General 40 4.8.2 Test setup and apparatus required for comparison measurements 40 4.8.3 General requirements 40 4.8.3.1 Test adapters 40 4.8.3.1.1 General . 40 4.8.3.1.2 Special patch cords 41 4.8.3.2 Compari
35、son methods . 42 4.8.3.2.1 Comparison method using worst case performance margin 42 4.8.3.2.2 Comparison method using full frequency responses 42 Annex A (informative) - Typical measurement accuracy of reference laboratory measurement systems . 44 Annex B (informative) - Bibliography 47 ANSI/TIA-115
36、2 v LIST OF FIGURES Figure 1 - Correct pairing . 4 Figure 2 - Incorrect pairing 4 Figure 3 - Example of NVP calibration 5 Figure 4 - Block diagram to measuring output signal balance 20 Figure 5 - Block diagram to measuring common mode rejection 21 Figure 6 - Block diagram for measuring residual NEXT
37、 loss. 22 Figure 7 - Block diagram for measuring dynamic accuracy 22 Figure 8 - Principle of measurement of residual FEXT loss 24 Figure 9 - Principle of alternate measurement of residual FEXT loss . 24 Figure 10 - Schematic diagram for testing the measurement floor of the channel test configuration
38、36 Figure 11 - Schematic diagram for testing the measurement floor of the permanent link test configuration . 37 Figure 12 - Schematic diagram to measure channel ANEXT loss 37 Figure 13 - Schematic diagram to measure channel AFEXT loss 38 Figure 14 - Special patch cord for the baseline and channel t
39、est comparison . 41 Figure 15 - Special patch cord for permanent link test comparison 41 Figure 16 - Example of observed Level IIIe accuracy . 43 LIST OF TABLES Table 1 - Field tester summary reporting requirements 6 Table 2 - Level IIe Nominal measurement accuracies at category 5e pass/fail limits
40、. 12 Table 3 - Level III nominal measurement accuracies at category 6 pass/fail limits 12 Table 4 - Level IIIe nominal measurement accuracies at category 6A pass/fail limits 13 Table 5 - Field tester requirements for length, propagation delay, and delay skew, applicable to all levels 13 Table 6 - Mi
41、nimum requirements for measurement accuracy of Level IIe field testers . 14 Table 7 - Explanation of notes in table 6 . 15 Table 8 - Minimum requirements for measurement accuracy of Level III field testers 16 Table 9 - Explanation of notes in table 8 . 17 Table 10 - Level IIIe field tester accuracy
42、performance 18 Table 11 - Explanation of notes in table 10 . 19 Table A.1 - Typical laboratory equipment accuracy performance parameters . 44 Table A.2 - Measurement performance parameters at key frequencies . 45 Table A.3 - Absolute reference load return loss 45 Table A.4 - Predicted measurement ac
43、curacy using laboratory equipment at category 6A channel limits . 46 ANSI/TIA-1152 vi FOREWORD (This foreword is not part of the Standard) In 2007, the Telecommunications Industry Association (TIA) TR-42 Engineering Committee began development of the ANSI/TIA-568-C series of structured cabling Stand
44、ards. In 2008, it was agreed to remove the specifications for field test instruments that are used to test balanced twisted-pair cabling from the ANSI/TIA-568-C series and place them in a standalone document. This project was assigned to TR-42.7 under Engineering Committee TR-42. The TR-42.7 Subcomm
45、ittee cooperated with several groups related to this activity. Approval of this Standard TIA standards documents are developed within the Technical Committees of the TIA and the standards coordinating committees of the TIA standards board. Members of the committees serve voluntarily and without comm
46、ission. The companies that they represent are not necessarily members of the TIA. The standards developed within the TIA represent a consensus of the broad expertise on the subject. This expertise comes from within the TIA as well as those outside of the TIA that have an expressed interest. The view
47、point expressed at the time that this standard was approved was from the contributors experience and the state of the art at that time. Users are encouraged to verify that they have the latest revision of the Standard. This standard has been prepared by the TR-42.7 Subcommittee and approved by the T
48、IA Engineering Committee TR-42 and the American National Standards Institute (ANSI). ANSI/TIA reviews standards every 5 years. At that time, standards are reaffirmed, rescinded, or revised according to the submitted updates. Updates to be included in the next revision should be sent to the committee
49、 chair or to ANSI/TIA. Documents superseded This Standard contains material that was originally published in and supersedes the information contained in: - Annex H of ANSI/TIA/EIA-568-B.2 - Annex I of ANSI/TIA/EIA-568-B.2 - Annex J of ANSI/TIA/EIA-568-B.2 - Annex E of ANSI/TIA-568-B.2-10 - Annex I of ANSI/TIA-568-B.2-10 Significant technical changes from the previous edition This standard does not add additional requirements to those previously specified. References to other standards have been updated. Relationship to other TIA standards and documents The following are related Standa
