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CONTENTS 4 FOREWORD 7 INTRODUCTION 9 1 Scope 10 2 Normative references 10 3 Terms, definitions and abbreviations 10 4 Cabling channel specifications for 25 GBASE-T 11 4.1 General 11 4.2 25GBASE-T application specifications 11 4.2.1 Return loss 11 4.2.2 Insertion loss/attenuation 12 4.2.3 NEXT 13 4.2.4 Attenuation to crosstalk ratio at the near-end (ACR-N) 15 4.2.5 Attenuation to crosstalk ratio at the far-end (ACR-F). 15 4.2.6 Propagation delay 17 4.2.7 Delay skew 17 4.2.8 Unbalance attenuation and coupling attenuation 17 4.2.9 Alien crosstalk 18 4.3 Associated risk of 25GBASE-T operation over installed cabling 19 4.4 Characterization of balanced channels using Category 7A components 19 4.4.1 General 19 4.4.2 Selection of channels for qualification 20 4.4.3 Return loss 20 4.4.4 Insertion loss 21 4.4.5 Near-end crosstalk loss (NEXT) 21 4.4.6 Attenuation to crosstalk loss ratio near-end (ACR-N) 23 4.4.7 Attenuation to crosstalk ratio far-end (ACR-F) 24 4.4.8 Alien (exogenous) crosstalk 26 4.4.9 Propagation delay 27 4.4.10 Delay skew 27 4.4.11 Coupling attenuation 27 4.4.12 Alien crosstalk and coupling attenuation 28 4.5 Characterization of balanced channels using Category 7 comp

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