ANSI/TIA/EIA-568-B.1-2001 Approved: April 12, 2001 TIA/EIA STANDARD B.1 - 568 - Commercial Building TIA/EIA Telecommunications Cabling Standard Part 1: General Requirements TIA/EIA-568-B.1 (Revision of TIA/EIA-568-A) MAY 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of NOTICE TIA/EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than TIA/EIA members, whether the standard is to be used either domestically or internationally. Standards and Publications are adopted by TIA/EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. (From Standards Proposal Nos.4425-B, 4425-B-1 and 4425-B-2, formulated under the cognizance of the TIA TR-42 Committee on User Premises Telecommunications Infrastructure.) Published by ÓTELECOMMUNICATIONS INDUSTRY ASSOCIATION 2001 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to current Catalog of EIA ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engineering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights reserved Printed in U.S.A. PLEASE! DON'T VIOLATE THE LAW! This document is copyrighted by the TIA and may not be reproduced without permission. Organizations may obtain permission to reproduce a limited number of copies through entering into a license agreement. For information, contact: Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5704 or call U.S.A. and Canada 1-800-854-7179, International (303) 397-7956 TIA/EIA-568-B.1 Commercial Building Telecommunications Cabling Standard; Part 1: General Requirements Table of Contents FOREWORD ........................................................................................................................... vi 1 INTRODUCTION .............................................................................................................. 1 1.1 Purpose ..........................................................................................................................1 1.2 Specification of criteria......................................................................................................1 1.3 Metric equivalents of US customary units ...........................................................................1 1.4 Life of this Standard..........................................................................................................1 1.5 Telecommunications cabling system structure....................................................................2 2 Scope................................................................................................................................. 4 2.1 Normative references ........................................................................................................4 3 DEFINITION OF TERMS, ACRONYMS AND ABBREVIATIONS, AND UNITS OF MEASURE ................................................................................................................................ 6 3.1 General ...........................................................................................................................6 3.2 Definition of terms ............................................................................................................6 3.3 Acronyms and abbreviations............................................................................................11 3.4 Units of measure............................................................................................................12 4 HORIZONTAL CABLING................................................................................................ 14 4.1 General .........................................................................................................................14 4.2 Topology .......................................................................................................................14 4.3 Horizontal distances .......................................................................................................15 4.4 Recognized cables .........................................................................................................16 4.5 Choosing types of cabling ...............................................................................................16 4.6 Grounding considerations................................................................................................17 5 BACKBONE CABLING................................................................................................... 18 5.1 General .........................................................................................................................18 5.2 Topology .......................................................................................................................18 5.2.1 Star topology ..........................................................................................................18 5.2.2 Accommodation of non-star configurations .................................................................19 5.2.3 Cabling directly between telecommunications rooms ..................................................19 5.3 Recognized cables .........................................................................................................20 5.4 Choosing media .............................................................................................................20 5.5 Backbone cabling distances............................................................................................21 5.5.1 Intra and interbuilding distances ................................................................................21 i TIA/EIA-568-B.1 5.5.2 Main cross-connect to entrance facility......................................................................22 5.5.3 Cross-connections...................................................................................................23 5.5.4 Cabling to telecommunications equipment .................................................................23 5.6 Grounding and bonding considerations .............................................................................23 6 WORK AREA................................................................................................................... 24 6.1 General .........................................................................................................................24 6.2 Telecommunications outlet/connector ..............................................................................24 6.2.1 100-Ohm balanced twisted-pair telecommunications outlet/connector...........................24 6.2.2 Optical fiber telecommunications outlet connector ......................................................25 6.3 Work area cords ............................................................................................................25 6.4 Open office cabling.........................................................................................................26 6.4.1 Multi-user telecommunications outlet assembly .........................................................26 6.4.1.1 Application planning..........................................................................................26 6.4.1.2 Installation practices .........................................................................................26 6.4.1.3 Administration ..................................................................................................27 6.4.1.4 Maximum lengths for copper cabling...................................................................27 6.4.1.5 Horizontal distances of optical fiber links (long work area cables)..........................28 6.4.2 Consolidation point ..................................................................................................28 6.4.2.1 Application planning..........................................................................................28 6.4.2.2 Installation practices .........................................................................................29 6.4.2.3 Administration ..................................................................................................29 7 TELECOMMUNICATIONS ROOMS............................................................................. 30 7.1 General .........................................................................................................................30