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TIA
STANDARD
Telecommunications Infrastructure
Standard for Data Centers
TIA-942
April 2005
TELECOMMUNICATIONS INDUSTRY ASSOCIATION
Representing the telecommunications industry in
association with the Electronic Industries Alliance
ANSI/TIA-942-2005
Approved: April 12, 2005
NOTICE
TIA 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 their particular need. The existence of
such Standards and Publications shall not in any respect preclude any member or non-member of
TIA from manufacturing or selling products not conforming to such Standards and Publications.
Neither shall the existence of such Standards and Publications preclude their voluntary use by
Non-TIA members, either domestically or internationally.
Standards and Publications are adopted by TIA in accordance with the American National
Standards Institute (ANSI) patent policy. By such action, TIA 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 No. 3-0092-C-1, formulated under the cognizance of the TIA
TR-42.1, Subcommittee on Commercial Building Telecommunications Cabling).
Published by
©TELECOMMUNICATIONS INDUSTRY ASSOCIATION
Standards and Technology Department
2500 Wilson Boulevard
Arlington, VA 22201 U.S.A.
PRICE: Please refer to current Catalog of
TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATION STANDARDS
AND ENGINEERING PUBLICATIONS
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APPLICABLE STATUTE, RULE OR REGULATION, OR THE SAFETY OR HEALTH EFFECTS OF THE
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CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS.
TIA–942
1
Telecommunications Infrastructure Standard
for Data Centers
Table of Contents
FOREWORD ................................................................................................................................... 8
1 SCOPE ................................................................................................................................ 12
1.1 General............................................................................................................................ 12
1.2 Normative references...................................................................................................... 12
2 DEFINITION OF TERMS, ACRONYMS AND ABBREVIATIONS, AND UNITS OF
MEASURE........................................................................................................................... 13
2.1 General............................................................................................................................ 13
2.2 Definition of terms ........................................................................................................... 13
2.3 Acronyms and abbreviations........................................................................................... 17
2.4 Units of measure............................................................................................................. 19
3 DATA CENTER DESIGN OVERVIEW................................................................................ 20
3.1 General............................................................................................................................ 20
3.2 Relationship of data center spaces to other building spaces.......................................... 20
3.3 Tiering ............................................................................................................................. 21
3.4 Consideration for involvement of professionals.............................................................. 21
4 DATA CENTER CABLING SYSTEM INFRASTRUCTURE ............................................... 22
4.1 The basic elements of the data center cabling system structure.................................... 22
5 DATA CENTER TELECOMMUNICATIONS SPACES AND RELATED TOPOLOGIES... 23
5.1 General............................................................................................................................ 23
5.2 Data center structure....................................................................................................... 23
5.2.1 Major elements ........................................................................................................ 23
5.2.2 Typical data center topology.................................................................................... 24
5.2.3 Reduced data center topologies.............................................................................. 24
5.2.4 Distributed data center topologies ........................................................................... 25
5.3 Computer room requirements ......................................................................................... 26
5.3.1 General .................................................................................................................... 26
5.3.2 Location ................................................................................................................... 27
5.3.3 Access ..................................................................................................................... 27
5.3.4 Architectural design ................................................................................................. 27
5.3.4.1 Size ....................................................................................................................................27
5.3.4.2 Guidelines for other equipment ..........................................................................................27
5.3.4.3 Ceiling height .....................................................................................................................27
5.3.4.4 Treatment...........................................................................................................................27
5.3.4.5 Lighting...............................................................................................................................28
5.3.4.6 Doors .................................................................................................................................28
5.3.4.7 Floor loading ......................................................................................................................28
5.3.4.8 Signage..............................................................................................................................28
5.3.4.9 Seismic considerations ......................................................................................................28
5.3.5 Environmental design .............................................................................................. 28
5.3.5.1 Contaminants.....................................................................................................................28
5.3.5.2 HVAC .................................................................................................................................29
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