1、 TIA STANDARD Commercial Building Telecommunications Cabling Standard Part 2: Balanced Twisted Pair Cabling Components Addendum 6 Category 6 Related Component Test Procedures TIA-568-B.2-6 (Supplement to TIA568-B.2) DECEMBER 2003 TELECOMMUNICATIONS INDUSTRY ASSOCIATION Representing the telecommunica
2、tions industry in association with the Electronic Industries Alliance ANSI/TIA-568-B.2-6 2003 Approved: December 23, 2003 Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE
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7、afety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal No. 3-4426-AD6, formulated under the cognizance of the TIA TR-42 Committee on User Premises Telecommunications Infrastructure.) Published by TELECOMMUNICATIONS INDUSTRY AS
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21、eNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.2-6 i CATEGORY 6 RELATED COMPONENT TEST PROCEDURE
22、S TABLE OF CONTENTS 1 INTRODUCTION.1 2 PURPOSE AND SCOPE.1 3 CATEGORY 6 MEASUREMENT REFINEMENTS .1 3.1 Table E.3 replacement 1 3.2 Further clause E.3.2.2 revisions . 2 3.3 Clause E.3.2.5 revisions . 2 3.4 Annex H replacement . 3 3.5 Annex J revisions 4 Copyright Telecommunications Industry Associati
23、on Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.2-6 1 1 INTRODUCTION After publication of the TIA-568-B.2-1 standard, the TR-42.7 UTP Systems Sub-Committee identified refinements and enhancements that result in imp
24、roved category 6 measurement accuracy and repeatability. The purpose of this addendum is to recognize refinements and enhancements that result in improved category 6 measurement accuracy and repeatability by revising clause E.3.2.2, clause E.3.2.5, annex H, annex J.3, and annex J.4 of TIA-568-B.2-1.
25、 2 PURPOSE AND SCOPE The following clauses contain refinements and enhancements to the measurement methods specified for category 6 components in the TIA-568-B.2-1 standard. 3 CATEGORY 6 MEASUREMENT REFINEMENTS 3.1 Table E.3 replacement Replace the existing table E.3 with the following new table: Ta
26、ble E.3 Category 6 de-embedded test plug NEXT loss ranges Pair combination NEXT loss magnitude range 1),4),5)NEXT loss phase range 2),3)3,6-4,5 36.4-20log(f/100) NEXT loss 37.6-20log(f/100) 50 100 MHz: (-90 + 1.5f/100) 1 100 250 MHz: (-90 + 1.5f/100) f/100 1,2-3,6 46.5-20log(f/100) NEXT loss 49.5-20
27、log(f/100) (-90 +1.5f/100) 3f/100 3,6-7,8 46.5-20log(f/100) NEXT loss 49.5-20log(f/100) (-90 +1.5f/100) 3f/100 1,2-4,5 7)NEXT loss 57-20log(f/100) 90 (30f/100)6)4,5-7,8 7)NEXT loss 57-20log(f/100) 90 (30f/100) 6)1,2-7,8 NEXT loss 60-20log(f/100) Any phase 1) Magnitude limits apply over the frequency
28、 range from 10 MHz to 250 MHz. 2) Phase limits apply over the frequency range from 50 MHz to 250 MHz. 3) When the measured plug NEXT loss is greater than 70 dB, the phase limit does not apply. 4) When a high limit NEXT loss calculation results in values greater than 70 dB, there shall be no high lim
29、it for NEXT loss. Refer to Table E.2 for an explanation of the high limit. 5) When a low limit NEXT loss calculation results in values greater than 70 dB, the low limit shall revert to 70 dB. Refer to table E.2 for an explanation of the low limit. 6) When the NEXT loss magnitude exceeds 70 20 log (f
30、/100), the phase requirement does not apply. 7) The requirements for 1-2,4-5 and 4,5-7,8 do not exclude plugs that meet cases 9 and 11, respectively, shown in table E.2, because such plugs are acceptable for field tester adapters. Copyright Telecommunications Industry Association Provided by IHS und
31、er license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.2-6 2 3.2 Further clause E.3.2.2 revisions Add the following new sentence and table after table E.3 and its corresponding note: In addition, the de-embedded test plug FEXT loss performance
32、 for all pair combinations shall satisfy the ranges shown in table E.3.1. Table E.3.1 FEXT loss ranges for category 6 NEXT loss test plugs Pair combination Frequency range (MHz) FEXT loss3), 4) magnitude range (dB) Phase 1), 2)(degrees) 3,6-4,5 10-250 46-20log(f/100) FEXT loss 56-20log(f /100) -90 (
33、30 f /100) 1,2-3,6 10-250 46-20log(f /100) FEXT loss 56-20log(f /100) -90 (30 f /100) 3,6-7,8 10-250 46-20log(f /100) FEXT loss 56-20log(f /100) -90 (30 f /100) 1,2-4,5 10-250 55-20log(f /100) any phase 4,5-7,8 10-250 55-20log(f /100) any phase 1,2-7,8 10-250 55-20log(f /100) any phase 1) When the m
34、easured plug FEXT loss is greater than 70 dB, the phase requirement does not apply. 2) Due to measurement accuracy considerations, phase measurement requirements below 50 MHz are specified for information only. 3) When upper limit FEXT loss calculations result in values greater than 70 dB, there sha
35、ll be no upper limit for FEXT loss. 4) When lower limit FEXT loss calculations result in values greater than 70 dB, the lower limit FEXT shall revert to a limit of 70 dB. 3.3 Clause E.3.2.5 revisions After table E.4, add the following: NOTE - It is recommended that connecting hardware FEXT loss shou
36、ld be characterized through measurement or calculation throughout the allowable FEXT loss test plug range for each pair combination. Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-
37、,-,-TIA-568-B.2-6 3 3.4 Annex H replacement The following method has been identified as a refined procedure for selecting reference jacks. The following text should replace all of the text currently appearing in annex H of TIA-568-B.2. Annex H De-embedding reference NEXT loss jack selection procedur
38、e (normative) H.1 Scope The performance of a particular laboratory de-embedded reference NEXT jack design can be compared to the reference jack vectors specified in clause E.3.2.1 by using the de-embedding procedures specified in clause D.5 of TIA-568-B.2. The procedure described in this annex defin
39、es a figure of merit for the consistency of the reference jack. The reference jack used to measure test plugs shall be within the best 25 % of at least 20 reference jacks measured on all pair combinations. This will minimize the measurement variance due to the variance within a lot of jacks. H.2 Mea
40、surement sampling plan The de-embedding procedures specified in clause D.5 of TIA-568-B.2 should be used to measure the reference jacks. The performance of a particular laboratory de-embedded reference jack shall be verified by determining the mated NEXT loss vector of multiple jack samples using on
41、e reference plug. A reference jack sample size of at least 20 pieces shall be measured. A reference jack sample size of at least 30 pieces should be measured. From these 30 pieces, 20 pieces should be selected that exclude the pieces causing the largest deviation from the average performance that is
42、 obtained as described below. The figure of merit shall be determined as follows: 1. Build a reference plug according to the instructions of annex D.5 of TIA- 568-B.2. 2. For each pair combination, do the following: 2.1. Measure real and imaginary NEXT of the mated reference plug and reference jack
43、between 10 MHz and 250 MHz. 2.2. Calculate the average of the mated reference plug and reference jack (RPRJ) real and imaginary parts for each frequency point. 2.3. Discard all real data points for all of the jacks where the average real RPRJ is less than 316 V/V. 2.4. Discard all imaginary data poi
44、nts for all of the jacks where the average imaginary RPRJ is less than 316 V/V 2.5. Calculate the difference between each RPRJ and the average RPRJ. The real and imaginary differences shall be calculated separately. 2.6. “Normalize“ the difference data by dividing each point by the frequency of meas
45、urement. 2.7. Square the normalized data. Square the real and imaginary data separately. 2.8. Sum all squared data over the frequency range. 3. Compile the results for all pair combinations. 4. Sum the data for all pair combinations for each sample. This will yield a single number as a figure of mer
46、it for each reference jack. The selected reference jacks shall be the 25% of the sample set with the lowest merit value. The remaining jacks shall be discarded, and shall not be used in additional qualification procedures. Copyright Telecommunications Industry Association Provided by IHS under licen
47、se with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-568-B.2-6 4 3.5 Annex J revisions The material from “J.3 Modular plug cord test procedure” through the end of paragraph J.4, up to clause J.4.1, of TIA-568-B.2-1 shall be replaced by the following: J.3
48、Modular plug cord test procedure A minimum of 100 data points per decade shall be measured for each pair combination. Pass or fail qualification shall be determined by comparing the resulting sweeps to the NEXT loss limits calculated per clause 7.2.1.3 for the applicable frequency range. A minimum o
49、f 200 data points per decade is required to qualify modular plug cords longer than 10 m (32 ft). The pass or fail margin and the frequency at which it occurs shall be reported for each pair combination. In addition, modular plug cords shall be qualified for return loss according to the requirements of clause 7.4.4. J.4 Category 6 modular plug cord test h
