PN-3-0134 to be published as TSB-155 Draft 4.0 i 1 DRAFT 4.0 2 3 May 1, 2006 4 5 GUIDELINES FOR THE ASSESSMENT AND MITIGATION OF INSTALLED CATEGORY 6 CABLING TO 6 SUPPORT 10GBASE-T 7 NOTICE OF DISCLAIMER AND LIMITATION OF LIABILITY 8 9 The document to which this Notice is affixed (the “Document”) has been prepared by one or more 10 Engineering Committees or Formulating Groups of the Telecommunications Industry Association 11 (“TIA”). TIA is not the author of the Document contents, but publishes and claims copyright to the 12 Document pursuant to licenses and permission granted by the authors of the contents. 13 14 TIA Engineering Committees and Formulating Groups are expected to conduct their affairs in 15 accordance with the TIA Engineering Manual (“Manual”), the current and predecessor versions of 16 which are available at http://www.tiaonline.org/standards/sfg/engineering_manual.cfm . 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THE FOREGOING NEGATION OF 2 DAMAGES IS A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND 3 THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. 4 5 6 GUIDELINES FOR THE ASSESSMENT AND MITIGATION OF INSTALLED CATEGORY 6 CABLING TO 7 SUPPORT 10GBASE-T 8 9 TABLE OF CONTENTS 10 1 INTRODUCTION 1 11 2 PURPOSE AND SCOPE 1 12 3 REFERENCES 1 13 4 DEFINITIONS, ACRONYMS & ABBREVIATIONS 1 14 4.1 Definitions 1 15 4.2 Acronyms and abbreviations 2 16 5 TEST CONFIGURATIONS 2 17 5.1 Channel test configuration 2 18 Figure 1 – Schematic representation of a channel test configuration 3 19 5.2 Permanent test configuration 3 20 Figure 2 – Schematic representation of a permanent link test configuration 4 21 5.3 Alien Crosstalk test configurations 4 22 6 Alien crosstalk channel coupling parameters 4 23 6.1 ANEXT loss 4 24 6.1.1 Pair-to-pair ANEXT loss 4 25 6.1.2 Power sum ANEXT loss 4 26 6.1.2.1 Channel power sum ANEXT loss 5 27 6.1.2.2. Channel average power sum ANEXT loss 5 28 6.1.2.3 Power sum ANEXT loss adjustment 6 29 6.1.2.3.1 Power sum ANEXT constant 6 30 6.2 AFEXT loss and AELFEXT 7 31 6.2.1 Pair-to-pair AELFEXT 7 32 6.2.2 Power sum AELFEXT 7 33 6.2.2.1 Channel power sum AELFEXT 8 34 6.2.2.2 Channel average power sum AELFEXT 9 35 6.2.2.3 Power sum AELFEXT adjustment 9 36 6.2.2.3.1 Power sum AELFEXT constant 9 37 7 Category 6 channel transmission parameters extended to 500 MHz 10 38 7.1 Insertion loss 10 39 7.1.1 Channel insertion loss 10 40 PN-3-0134 to be published as TSB-155 Draft 4.0 iii 7.2 NEXT loss 11 1 7.2.1 Channel pair-to-pair NEXT loss 11 2 7.2.2 Power sum NEXT loss 12 3 7.2.2.1 Channel power sum NEXT loss 12 4 7.3 ELFEXT and FEXT loss 13 5 7.3.1 Channel pair-to-pair ELFEXT 13 6 7.3.2 Power sum ELFEXT 14 7 7.3.2.1 Channel power sum ELFEXT 14 8 7.4 Return loss 15 9 7.4.1 Channel return loss 15 10 7.5 Propagation delay/delay skew 16 11 7.5.1 Cabling propagation delay 16 12 7.5.2 Cabling propagation delay skew 16 13 8 Category 6 permanent link transmission parameters extended to 500 MHz 16 14 8.1 Permanent link Insertion loss 16 15 8.2. Permanent link pair-to-pair NEXT loss 17 16 8.2.1. Permanent link power sum NEXT loss 18 17 8.3. Permanent link pair-to-pair ELFEXT 19 18 8.3.2. Permanent link power sum ELFEXT 20 19 8.4. Permanent link return loss 20 20 Annex A Cabling (field) measurement procedures 22 21 A.1 General 22 22 A.2 Frequency range 22 23 A.3. Test parameters 22 24 A.4 Test configurations 22 25 Figure A.1 – Schematic representation of a channel alien crosstalk test configuration 23 26 A.5. Channel Alien Crosstalk Field Testing 23 27 A.6. Measurement floor of the test device and patch/test cord power sum ANEXT loss 23 28 A.6.1.Measurement floor of the test device for the channel test configuration 23 29 Figure A.2 - Schematic diagram for testing the measurement floor of the channel test 30 configuration 24 31 A.7 Alien Crosstalk measurements 24 32 A.7.1 Measuring power sum ANEXT loss in the channel configuration 24 33 Figure A.3 - Schematic diagram to measure channel power sum ANEXT loss 24 34 A.7.2 Measuring power sum AFEXT loss in the channel configuration 25 35 Figure A.4 - AFEXT loss measurement test configuration 25 36 A.8. General test strategies for alien crosstalk field testing 25 37 A.9 Processing measurement data 26 38 A.9.1 Significance condition testing 26 39 PN-3-0134 to be published as TSB-155 Draft 4.0 iv A.9.2 Computing the power sum ANEXT loss and power sum AELFEXT 26 1 A.9.3 Applying the correction for the measurement floor (optional) 27 2 Annex B Alien Crosstalk Mitigation 28 3 Annex B.1 Alien Crosstalk mitigation procedures 28 4 Annex C Alien Crosstalk Margin Computation 29 5 6 LIST OF FIGURES 7 8 Figure 1 – Schematic representation of a channel test configuration 3 9 Figure 2 – Schematic representation of a permanent link test configuration 4 10 Figure A.1 – Schematic representation of a channel alien crosstalk test configuration 23 11 Figure A.2 - Schematic diagram for testing the measurement floor of the channel test 12 configuration 24 13 Figure A.3 - Schematic diagram to measure channel power sum ANEXT loss 24 14 Figure A.4 - AFEXT loss measurement test configuration 25 15 16 17 LIST OF TABLES 18 19 Table 1– Calculated power sum ANEXT constants 5 20 Table 2– Calculated average power sum ANEXT constants 6 21 Table 3– Calculated power sum AELFEXT constants 9 22 Table 4– Calculated average power sum AELFEXT constants 9 23 Table 5– Channel insertion loss 11 24 Table 6– Channel NEXT loss, worst pair-to-pair 12 25 Table 7– Channel power sum NEXT loss 13 26 Table 8– Channel ELFEXT, worst pair-to-pair 14 27 Table 9– Channel power sum ELFEXT 15 28 Table 10– Channel return loss equations 15 29 Table 11– Channel return loss 16 30 Table 12– Permanent link insertion loss 17 31 Table 13– Permanent link NEXT loss, worst pair-to pair 18 32 Table 14– Permanent link power sum NEXT loss 19 33 Table 15– Permanent link ELFEXT, worst pair-to-pair 19 34 Table 16– Permanent link power sum ELFEXT 20 35 Table 17– Permanent link return loss equations 20 36 Table 18– Permanent link return loss 21 37 Table 19 – Minimum Power Backoff 29 38 PN-3-0134 to be published as TSB-155 Draft 4.0 v FOREWORD 1 2 (This foreword is not part of the Telecommunications Systems Bulletin) 3 4 At the request of the Institute of Electrical and Electronics Engineers (IEEE) 802.3 5 Working Group, TIA agreed to create additional guidelines for 4-pair 100  Category 6 Cabling 6 for 10GBASE-T Applications. The project was assigned to TR-42.7 under Engineering Committee 7 TR-42. 8 9 TIA standards documents are developed within the Technical Committees of the TIA and the 10 standards coordinating committees of the TIA standards board. Members of the committees 11 serve voluntarily and without commission. The companies that they represent are not 12 necessarily members of the TIA. The standards developed within the TIA represent a consensus 13 of the broad expertise on the subject. This expertise comes from within the TIA as well as those 14 outside of the TIA that have an expressed interest. The viewpoint expressed at the time that this 15 standard was approved was from the contributors’ experience and the state of the art at that time. 16 Users are encouraged to verify that they have the latest revision of the standard. 17 18 This telecommunications bulletin has been prepared by the TR-42.7 Subcommittee and approved 19 by the Technical Committee TR-42. 20 21 There are three annexes in this TSB. Alien crosstalk field testing procedures and alien crosstalk 22 mitigation guidelines are addressed in annex A and annex B respectively and an alien crosstalk 23 margin computation is provided in annex C. 24 PN-3-0134 to be published as TSB-155 Draft 4.0 1 1 INTRODUCTION 1 The guidelines of this Telecommunications Systems Bulletin (TSB) contain additional 2 recommendations to further characterize existing category 6 cabling plant as specified in TIA-3 568B.2-1 for 10GBASE-T applications. This TSB includes field test procedures and field tester 4 guidelines that can be used for this assessment. 5 NOTE - The terms “guidelines” and “recommendations” are used interchangeably within 6 this Telecommunications Systems Bulletin. 7 2 PURPOSE AND SCOPE 8 This TSB describes additional guidelines to support the IEEE 802.3an 10GBASE-T standard for 9 using 100 , 4-pair category 6 cabling meeting the requirements of TIA/EIA-568-B.2-1. This TSB 10 characterizes the crosstalk coupling between 4- pair category 6 cabling in close proximity 11 referred to as alien crosstalk and provides additional guidelines for field test equipment and field 12 test methods and alien crosstalk mitigation. These guidelines provide additional information on 13 the extended frequency transmission performance expected of category 6 cabling extended from 14 250 MHz to 500 MHz. The transmission parameter recommendations included herein provide a 15 means to assess installations of category 6 cabling, as specified in TIA/EIA-568-B.2-1 and 16 corresponding addenda, up to the extended frequencies and for the additional parameters 17 necessary to support 10GBASE-T. This TSB does not specify any requirements for category 6 18 cabling systems or components, beyond those already given in TIA-568B.2-1. 19 3 REFERENCES 20 The following standards are referenced in this text. At the time of publication, the editions 21 indicated were valid. All standards are subject to revision; parties to agreements based on this 22 TSB are encouraged to investigate the possibility of applying the most recent editions of the 23 standards indicated. ANSI and TIA maintain registers of currently valid national standards 24 published by them. 25 26 ANSI/TIA/EIA-568-B.1, Commercial Building Telecommunications Cabling Standard Part 1: 27 General Requirements 28 29 ANSI/TIA/EIA-568-B.2, Commercial Building Telecommunications Cabling Standard Part 2: 100 30 Ohm Balanced Twisted-pair Cabling Standard 31 32 ANSI/TIA/EIA-568-B.2-1, Transmission Performance Specifications for 4 Pair 100 Ohm Category 33 6 Cabling 34 35 ANSI/TIA/EIA-568-B.2-10, Transmission Performance Specifications for 4 Pair 100 Ohm 36 Augmented Category 6 Cabling 37 4 DEFINITIONS, ACRONYMS & ABBREVIATIONS 38 4.1 Definitions 39 The generic definitions in this section have been formulated for use by the entire family of 40 telecommunications infrastructure standards. As such, the definitions do not contain mandatory 41 requirements of the Standard. Specific requirements are found in the normative sections of this 42 Standard. 43 44 Alien crosstalk: A measure of the unwanted signal coupling between cabling or components in 45 close proximity. 46 47 Alien near-end crosstalk loss: A measure of the unwanted signal coupling between pairs in 48 cabling in close proximity from transmit signals at the near-end into a pair measured at the near-49 end. 50 PN-3-0134 to be published as TSB-155 Draft 4.0 2 Power sum alien near-end crosstalk loss: A computation of the unwanted signal coupling 1 between pairs in cabling in close proximity from multiple transmit signals at the near-end into a 2 pair measured at the near-end. 3 4 Alien far-end crosstalk loss: A measure of the unwanted signal coupling between pairs in 5 cabling in close proximity from transmit signals at the near-end into a pair measured at the 6 far-end. 7 8 Power sum alien far-end crosstalk loss: A computation of the unwanted signal coupling 9 between pairs in cabling in close proximity from multiple transmit signals at the near-end into 10 another pair measured at the far-end. 11 12 Power sum alien equal level far-end crosstalk: A computation of the unwanted signal coupling 13 between pairs in cabling in close proximity from multiple transmit signals at the near-end into 14 another pair measured at the far-end, and relative to the received signal level. 15 16 Note: The definitions of equal level far-end crosstalk (ELFEXT) and power sum equal level far-17 end crosstalk (PSELFEXT) as used in this standard are defined in ASTM D 4566 as attenuation 18 to crosstalk ratio far end (ACR-F) and power sum attenuation to crosstalk ratio, far end (PSACR-19 F) respectively. 20 4.2 Acronyms and abbreviations 21 ANEXT Alien near-end crosstalk 22 PSANEXT Power sum alien near-end crosstalk 23 AFEXT Alien far-end Crosstalk 24 PSAFEXT Power sum alien far-end crosstalk 25 PSAELFEXT Power sum alien equal level far-end crosstalk 26 5 TEST CONFIGURATIONS 27 The following guidelines are for the assessment of the channel and permanent link transmission 28 parameters over the frequency range of 1 MHz to 500 MHz. 29 5.1 Channel test configuration 30 The channel test configuration is used by system designers and users of telecommunications 31 systems to verify the performance of the overall channel. The channel includes up to 90 m 32 (295 ft) of horizontal cable, a work area equipment cord, a telecommunications outlet/connector, 33 an optional consolidation point connector, two connections in the telecommunications room, and 34 an equipment cord. The total length of equipment cords, patch cords or jumpers and work area 35 cords does not exceed 10 m (32.8 ft). The channel configuration excludes the connections to the 36 equipment at each end of the channel. The channel definition does not apply to those cases 37 where the horizontal cabling is cross-connected to the backbone cabling. A schematic 38 representation of the channel test configuration is illustrated in figure 1. 39 40 41 42 43 44 45 46 47 48 49 50 51 52 PN-3-0134 to be published as TSB-155 Draft 4.0 3 1 Figure 1 – Schematic representation of a channel test configuration 2 3 5.2 Permanent test configuration 4 5 The permanent link test configuration is used by installers and users of data telecommunications 6 systems to verify the performance of permanently installed cabling. The permanent link consists 7 of up to 90 m (295 ft) of horizontal cabling and one connection at each end and may also include 8 an optional transition/consolidation point connection. The permanent link configuration excludes 9 both the cable portion of the test equipment cord and the connection to the test instrument. A 10 schematic representation of the permanent link test configuration is illustrated in Figure 2. 11 12 13 14 15 Legend Cables and cords Connecting hardware Work area cord A Telecommunications outlet/ Optional transition cabling B connector WA Horizontal cabling C optional consolidation Patch cord or jumper cable D point connector CP Telecommunications room Horizontal cross-connect or equipment cord E interconnect C1, C2 Maximum length B + C 90 m (295 ft) A + D + E 10 m (32.8 ft) Work area equipment A B C D E Equipment in TR CPWA C1 C2 Channel under test PN-3-0134 to be published as TSB-155 Draft 4.0 4 1 Figure 2 – Schematic representation of a permanent link test configuration 2 5.3 Alien Crosstalk test configurations 3 The alien crosstalk test configurations are used to assess the alien crosstalk performance 4 between the disturbed pair and disturbing pairs of category 6 channels. 5 6 The transmission performance of the channel test configurations consists of single channels and 7 therefore does not address the alien crosstalk test configurations. 10GBASE-T is expected to 8 operate over channel lengths of at least 37 meters (TBD) of Category 6 cabling. Channel lengths 9 between 37 (TBD) and 55 meters are expected to support 10GBASE-T depending on the alien 10 crosstalk environment. Channel lengths over 55 meters may require mitigation (see Annex B in 11 order to support 10GBASE-T) 12 13 Alien crosstalk field testing procedures and alien crosstalk mitigation guidelines are addressed in 14 annex A and annex B respectively. An alien crosstalk margin computation is provided in annex C. 15 6 Alien crosstalk channel coupling parameters 16 6.1 ANEXT loss 17 ANEXT loss is a measure of the unwanted signal coupling between pairs in cabling in close 18 proximity from transmit signals at the near-end into a pair measured at the near-end. AlNEXT 19 loss is expressed in dB relative to the transmit signal level. Since each channel can be disturbed 20 by more than one other channel in close proximity, power sum alien near-end crosstalk 21 (PSANEXT) loss is provided. 22 6.1.1 Pair-to-pair ANEXT loss 23 Pair-to-pair ANEXT measurements are used in the calculation of power sum ANEXT 24 recommendations given in Clause 6.1.2 and for the determination of threshold values for 25 mitigation of power sum ANEXT in annex B. 26 6.1.2 Power sum ANEXT loss 27 Power sum alien near-end crosstalk loss takes into account the combined crosstalk (statistical) 28 on a receive pair from near-end disturbers in channels in close proximity. The power sum near-29 end crosstalk (PSANEXT) loss is determined by summing the power of the individual pair-to-pair 30 Legend Cables and cords Connecting hardware Test equipment cord F Telecommunications outlet/ Optional transition cabling B connector……………………… WA Horizontal cabling C Consolidation point connector……… CP Horizontal cross-connect or Interconnect…………………… C1 Maximum length B + C 90 m (295 ft) Test instrument F B C F Test instrument CPWA C1 Permanent link under test PN-3-0134 to be published as TSB-155 Draft 4.0 5 differential ANEXT loss values over the frequency range 1 MHz to 500 MHz as follows in 1 equation (1): 2 ∑∑ = = − −= m j i Nji N fANEXT fPSANEXT 1 4 1 ,, 10 )( 10log10)( (dB) (1) 3 Where: 4 5  Nji fANEXT ,, )( is the measured ANEXT of the individual pair combination (1 to 4) of 6 the disturbing link (1 to m) for each disturbed pair N. 7 8 The alien crosstalk margin computation detailed in annex C may be applied in the event that the 9 power sum ANEXT limits specified in 6.1.2.1 equation (2) or 6.1.2.2 equation (4) are not met. The 10 alien crosstalk margin computation further characterizes the alien crosstalk coupling "between" 11 channels by evaluating the total combined power sum AFEXT and power sum ANEXT. 12 13 6.1.2.1 Channel power sum ANEXT loss 14 The power sum ANEXT loss between a disturbed channel and the disturbing channels in cabling 15 in close proximity should meet the values determined using equation (2) for each disturbed pair. 16 17 18 19 500100) 100 log(151 1001) 100 log(101 ≤<− ≤≤− ≥ fdB f X fdB f X PSANEXT (2) 20 21 where: f is the frequency in MHz and X1 is the power sum ANEXT constant defined in 6.1.2.3.1. 22 23 The calculated power sum ANEXT loss values greater that 67 dB are for information only. 24 25 The power sum ANEXT loss determined using equation (2) utilizes the power sum ANEXT 26 constant determined using equation (5). The power sum ANEXT constant and the insertion loss 27 at 250 MHz determined using equation (6), for channel lengths of 100 m and 55 m, are listed in 28 table 1. 29 Table 1– Calculated power sum ANEXT constants 30 31 Channel Length PSANEXT constant (X1) (dB) Insertion Loss at 250 MHz (dB) 100 m 62 35.9 55 m 47 20.3 32 6.1.2.2. Channel average power sum ANEXT loss 33 The average power sum ANEXT is calculated by averaging the individual power sum ANEXT 34 loss values in dB for all four pairs in the disturbed channel at each frequency point as shown in 35 equation (3). 36 37 38 [...]... 10-20log(f/250) 6 10 Draft 4.0 20 PN-3-0134 to be published as TSB-155 1 Table 18– Permanent link return loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 21 Draft 4.0 Return loss (dB) 19.1 21.0 21.0 21.0 20.0 19.5 19.0 18.5 16.0 14.0 11.0 10.0 8.4 6.0 6.0 PN-3-0134... (20) − 20 log⎜10 + 2 ⋅10 ⎜ ⎟ ⎜ ⎟ ⎝ ⎠ 28 − 42 log( f / 330) dB 330 ≤ f ≤ 500 (21) 23 24 Draft 4.0 12 PN-3-0134 to be published as TSB-155 1 Table 7– Channel power sum NEXT loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 3 PSNEXT loss (dB) 62.0 60.5 55.6 54.0 50.6 49.0 47.3 45.7 40.6 37.1 31.9 30.2 28.8 24.5 20.4 7.3 ELFEXT and FEXT loss 4 5 6 7 8... 250 < f < 398 398 ≤ f ≤ 500 10 11 12 13 14 15 15 Draft 4.0 Return loss (dB) 19 24- 5log10(f) 32- 10log10(f) 32- 10log10(f) 6 PN-3-0134 to be published as TSB-155 1 Table 11– Channel return loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 3 Return loss (dB) 19.0 19.0 19.0 19.0 18.0 17.5 17.0 16.5 14.0 12.0 9.0 8.0 7.2 6 6 7.5 Propagation delay/delay... 15 16 17 18 19 20 21 22 23 24 17 Draft 4.0 dB 300 ≤ f ≤ 500 (27) ⎞ ⎟ ⎟ dB 1 ≤ f < 330 (26) ⎟ ⎟ ⎠ PN-3-0134 to be published as TSB-155 1 Table 13– Permanent link NEXT loss, worst pair-to pair 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 NEXT loss (dB) 65.0 64.1 59.4 57.8 54.6 53.1 51.5 50.0 45.1 41.8 36.9 35.3 34.0 30.0 25.3 3 4 5 6 7 8 9 10 8.2.1 Permanent... 0.25 ⎞ ⎟ + 4 ⋅ 0.02 f InsertionLossChannel ≤ 1.05 ⋅ ⎜1.82 f + 0.0169 ⋅ f + dB ⎜ f ⎟ ⎝ ⎠ (16) 39 40 Draft 4.0 10 PN-3-0134 to be published as TSB-155 1 Table 5– Channel insertion loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 Insertion loss (dB) 2.1 4.0 5.7 6.3 8.0 9.0 10.1 11.4 16.5 21.3 31.5 35.9 39.8 46.9 53.4 3 7.2 NEXT loss 4 5 6 7 NEXT loss is... 44.3 − 15 log( f / 100) ⎜ ⎟ − 20 − 20 ⎟ dB 1 ≤ f < 330 (17) − 20 log⎜10 + 2 ⋅ 10 ⎜ ⎟ ⎜ ⎟ ⎝ ⎠ 31 − 50 log( f / 330) 12 13 14 15 11 Draft 4.0 dB 330 ≤ f ≤ 500 (18) PN-3-0134 to be published as TSB-155 1 Table 6– Channel NEXT loss, worst pair-to-pair 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 NEXT loss (dB) 65.0 63.0 58.2 56.6 53.2 51.6 50.0 48.4 43.4... using equation (25) The values in table 12 are provided for information only 24 25 26 InsertionLossPL ≤ 1.687 f + 0.0153 ⋅ f + Draft 4.0 0.18 f + 0.00015 ⋅ f 1.5 dB (25) 16 PN-3-0134 to be published as TSB-155 1 Table 12– Permanent link insertion loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 Insertion loss (dB) 1.9 3.5 5.0 5.5 7.0 7.9 8.9 10.0 14.4... 14 43.1 − 20log( f /100) ⎞ ⎛ 27.8 − 20log( f /100) ⎜ ⎟ − 20 − 20 ⎟ dB ELFEXT ≥ −20log⎜10 + 4 ⋅10 channel ⎜ ⎟ ⎜ ⎟ ⎝ ⎠ 15 16 17 18 19 20 13 Draft 4.0 (22) PN-3-0134 to be published as TSB-155 1 Table 8– Channel ELFEXT, worst pair-to-pair 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 ELFEXT (dB) 63.3 51.2 45.2 43.3 39.2 37.2 35.3 33.4 27.3 23.3 17.2 15.3... 20 log⎜10 + 10 ⎜ ⎜ ⎝ 31.4 − 40 log( f / 300) dB 300 ≤ f ≤ 500 ⎞ ⎟ ⎟ dB 1 ≤ f < 300 (28) ⎟ ⎟ ⎠ (29) 13 14 15 16 17 18 19 20 21 22 23 24 25 Draft 4.0 18 PN-3-0134 to be published as TSB-155 1 Table 14– Permanent link power sum NEXT loss 2 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 3 PSNEXT loss (dB) 62.0 61.8 57.0 55.5 52.2 50.7 49.1 47.5 42.7 39.3... 27.8 − 20log( f /100) ⎜ ⎟ − 20 − 20 ⎟ dB ELFEXT ≥ −20log⎜10 + 3 ⋅10 PL ⎜ ⎟ ⎜ ⎟ ⎝ ⎠ 6 Table 15– Permanent link ELFEXT, worst pair-to-pair 7 Frequency (MHz) 1.0 4.0 8.0 10.0 16.0 20.0 25.0 31.25 62.5 100.0 200.0 250.0 300.0 400.0 500.0 19 Draft 4.0 ELFEXT (dB) 64.2 52.1 46.1 44.2 40.1 38.2 36.2 34.3 28.3 24.2 18.2 16.2 14.6 12.1 10.2 (30) PN-3-0134 to be published as TSB-155 1 8.3.2 Permanent link power . 1 .0 4. 0 8 .0 10. 0 16 .0 20. 0 25 .0 31.25 62.5 100 .0 200 .0 2 50. 0 300 .0 40 0 .0 500 .0 60. 3 48 .2 42 .2 40 .3 36.2 34. 2 32.3 30 .4 24. 3 20. 3. 8 .0 10. 0 16 .0 20. 0 25 .0 31.25 62.5 100 .0 200 .0 2 50. 0 300 .0 40 0 .0 500 .0 62 .0 60. 5 55.6 54. 0 50. 6 49 .0 47 .3 45 .7 40 .6 37.1 31.9 30. 2