1、 TIA-942-A (Revision of TIA-942) March 2014Telecommunications Infrastructure Standard for Data Centers ANSI/TIA-942-A-2012 APPROVED: AUGUST 2, 2012 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers
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20、 Infrastructure Standard for Data Centers Table of Contents FOREWORD . VII 1 SCOPE 1 2 NORMATIVE REFERENCES 1 3 DEFINITION OF TERMS, ACRONYMS AND ABBREVIATIONS, AND UNITS OF MEASURE . 2 3.1 General . 2 3.2 Definition of terms 2 3.3 Acronyms and abbreviations 6 3.4 Units of measure . 7 4 DATA CENTER
21、DESIGN OVERVIEW 9 4.1 General . 9 4.2 Relationship of data center spaces to other building spaces . 9 4.3 Availability and Security 10 4.4 Consideration for involvement of professionals . 11 5 DATA CENTER CABLING SYSTEM INFRASTRUCTURE . 12 6 DATA CENTER TELECOMMUNICATIONS SPACES AND RELATED TOPOLOGI
22、ES . 15 6.1 General . 15 6.2 Data center structure . 15 6.2.1 Major elements . 15 6.2.2 Basic data center topology . 16 6.2.3 Reduced data center topologies 17 6.2.4 Distributed data center topologies . 17 6.3 Energy efficient design . 18 6.3.1 General . 18 6.3.2 Energy efficiency recommendations .
23、19 6.3.2.1 General . 19 6.3.2.2 Telecommunications cabling 19 6.3.2.3 Telecommunications pathways 20 6.3.2.4 Telecommunications spaces . 20 6.4 Computer room requirements . 21 6.4.1 General . 21 6.4.2 Location 22 6.4.3 Access . 22 6.4.4 Architectural design . 22 6.4.4.1 Size . 22 6.4.4.2 Guidelines
24、for other equipment 22 6.4.4.3 Ceiling height . 22 6.4.4.4 Lighting 22 6.4.4.5 Doors 23 6.4.4.6 Floor loading 23 6.4.4.7 Uninterruptable power notification 23 6.4.4.8 Signage . 23 ANSI/TIA-942-A ii 6.4.4.9 Seismic considerations . 23 6.4.5 Environmental design . 24 6.4.5.1 Contaminants . 24 6.4.5.2
25、HVAC 24 6.4.5.2.1 Operational parameters . 24 6.4.5.2.2 Continuous operation 24 6.4.5.2.3 Standby operation . 24 6.4.5.3 Radio sources . 24 6.4.5.4 Batteries . 24 6.4.5.5 Vibration 24 6.4.6 Electrical design . 24 6.4.6.1 Power . 24 6.4.6.2 Standby power 25 6.4.6.3 Bonding and grounding (earthing) .
26、25 6.4.7 Fire protection 25 6.4.8 Water infiltration 25 6.5 Entrance room requirements . 25 6.5.1 General . 25 6.5.2 Location 25 6.5.3 Quantity 26 6.5.4 Entrance conduit routing under access floor 26 6.5.5 Access provider and service provider spaces . 26 6.5.6 Building entrance terminal . 26 6.5.7 A
27、rchitectural design . 26 6.5.7.1 General . 26 6.5.7.2 Size . 26 6.5.7.3 Plywood backboards 27 6.5.7.4 Ceiling height . 27 6.5.7.5 Lighting 27 6.5.7.6 Doors 27 6.5.7.7 Signage . 27 6.5.7.8 Seismic considerations . 27 6.5.7.9 Environmental design . 27 6.5.7.10 Electrical design . 27 6.5.8 Fire protect
28、ion 28 6.5.9 Water infiltration 28 6.6 Main distribution area . 28 6.6.1 General . 28 6.6.2 Location 28 6.6.3 Facility requirements 28 6.7 Intermediate distribution area . 28 6.7.1 General . 28 6.7.2 Location 28 6.7.3 Facility requirements 29 6.8 Horizontal distribution area 29 6.8.1 General . 29 6.
29、8.2 Location 29 6.8.3 Facility requirements 29 6.9 Zone distribution area . 29 6.10 Equipment distribution areas 29 6.11 Telecommunications room . 30 6.12 Data center support areas 30 6.13 Cabinets and racks 30 6.13.1 General . 30 6.13.2 “Hot“ and “cold“ aisles . 30 6.13.3 Placement relative to floo
30、r tile grid 31 6.13.4 Access floor tile cuts . 31 6.13.5 Installation of racks on access floors . 31 ANSI/TIA-942-A iii 6.13.6 Racks and cabinets in entrance room, MDAs, IDAs and HDAs . 32 7 DATA CENTER CABLING SYSTEMS . 33 7.1 General . 33 7.2 Choosing media 33 7.3 Horizontal Cabling . 33 7.3.1 Gen
31、eral . 33 7.3.2 Topology . 34 7.3.3 Horizontal cabling length . 34 7.3.4 Recognized media . 34 7.3.5 Optical fiber connectors . 35 7.3.6 Coaxial cable connectors . 35 7.4 Backbone cabling . 35 7.4.1 General . 35 7.4.2 Topology . 35 7.4.2.1 Star topology 35 7.4.2.2 Accommodation of non-star configura
32、tions . 36 7.4.3 Redundant cabling topologies 36 7.4.4 Recognized media . 37 7.4.5 Optical fiber connectors . 37 7.4.6 Coaxial cable connectors . 37 7.4.7 Backbone cabling lengths . 37 7.5 Centralized optical fiber cabling . 37 7.5.1 General . 37 7.5.2 Implementation . 37 7.6 Cabling transmission pe
33、rformance and test requirements 38 7.6.1 General . 38 7.6.2 Additional requirements for field testing of 75-ohm coaxial cabling . 38 8 DATA CENTER CABLING PATHWAYS 39 8.1 General . 39 8.2 Security for data center cabling 39 8.3 Separation of power and telecommunications cables . 39 8.3.1 Separation
34、between power or lighting and balanced twisted-pair cables 39 8.3.2 Practices to accommodate power separation requirements . 39 8.3.3 Separation of fiber and balanced twisted-pair cabling 40 8.4 Telecommunications entrance pathways 40 8.4.1 Entrance pathway types 40 8.4.2 Diversity . 40 8.4.3 Sizing
35、 40 8.5 Access floor systems 41 8.5.1 General . 41 8.5.2 Cable trays for telecommunications cabling 41 8.5.3 Access floor performance requirements . 41 8.5.4 Floor tile cut edging . 41 8.5.5 Cable types under access floors . 42 8.6 Overhead cable trays 42 8.6.1 General . 42 8.6.2 Cable tray support
36、42 8.6.3 Coordination of cable tray routes . 42 9 DATA CENTER REDUNDANCY 44 9.1 Introduction 44 9.2 Redundant maintenance holes and entrance pathways . 45 9.3 Redundant access provider services . 45 9.4 Redundant entrance room . 45 ANSI/TIA-942-A iv 9.5 Redundant main distribution area . 45 9.6 Redu
37、ndant backbone cabling 46 9.7 Redundant horizontal cabling . 46 ANNEX A (INFORMATIVE) CABLING DESIGN CONSIDERATIONS 47 A.1 Application cabling lengths 47 A.1.1 T-1, E-1, T-3 and E-3 circuit lengths 47 A.1.2 Baluns E-3 and T-3 circuits 49 A.1.3 TIA-232 and TIA-561 console connections . 50 A.2 Cross-c
38、onnections . 51 A.3 Separation of functions in the main distribution area . 51 A.3.1 Twisted-pair main cross-connect 51 A.3.2 Coaxial main cross-connect . 51 A.3.3 Optical fiber main cross-connect 51 A.4 Separation of functions in the horizontal distribution area . 52 A.5 Cabling to end equipment .
39、52 A.6 Fiber design consideration 52 A.7 Balanced twisted-pair design consideration . 52 ANNEX B (INFORMATIVE) ACCESS PROVIDER INFORMATION . 53 B.1 Access provider coordination . 53 B.1.1 General . 53 B.1.2 Information to provide to access providers 53 B.1.3 Information that the access providers sho
40、uld provide 53 B.2 Access provider demarcation in the entrance room 54 B.2.1 Organization . 54 B.2.2 Demarcation of low-speed circuits . 54 B.2.3 Demarcation of T-1 circuits 57 B.2.4 Demarcation of E-3 advisory requirements are designated by the words “should”, “may”, or “desirable”, which are used
41、interchangeably in this Standard. Mandatory criteria generally apply to protection, performance, administration and compatibility; they specify the absolute minimum acceptable requirements. Advisory or desirable criteria are presented when their attainment will enhance the general performance of the
42、 cabling system in all its contemplated applications. A note in the text, table, or figure is used for emphasis or for offering informative suggestions. Metric equivalents of US customary units The dimensions in this Standard are metric or US customary with soft conversion to the other. Life of this
43、 Standard This Standard is a living document. The criteria contained in this Standard are subject to revisions and updating as warranted by advances in building construction techniques and telecommunications technology. ANSI/TIA-942-A 1 1 SCOPE This Standard specifies the minimum requirements for te
44、lecommunications infrastructure of data centers and computer rooms, including single tenant enterprise data centers and multi-tenant Internet hosting data centers. The topology specified in this document is intended to be applicable to any size data center. 2 NORMATIVE REFERENCES The following stand
45、ard contains provisions that, through references in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility
46、of applying the most recent editions of the standards published by them. a) ANSI/TIA-568-C.0, Generic Telecommunications Cabling for Customer Premises b) ANSI/TIA-568-C.1, Commercial Building Telecommunications Cabling Standard c) ANSI/TIA-568-C.2, Balanced Twisted-Pair Telecommunications Cabling an
47、d Components Standard d) ANSI/TIA-568-C.3, Optical Fiber Cabling Components Standard e) ANSI/TIA-569-C, Telecommunications Pathways and Spaces f) ANSI/TIA-604.5-D, FOCIS 5 Fiber Optic Connector Intermateability Standard, Type MPO g) ANSI/TIA/EIA-604-10-A, FOCIS 10 Fiber Optic Connector Intermateabil
48、ity Standard, Type LC h) ANSI/TIA-606-B, Administration Standard for Telecommunications Infrastructure i) ANSI/TIA-607-B, Telecommunications Bonding and Grounding (Earthing) for Customer Premises j) ANSI/TIA-758-B, Customer-Owned Outside Plant Telecommunications Infrastructure Standard k) ANSI/NFPA
49、70-2011, National Electrical Code l) ANSI/NFPA 75-2009, Standard for the Protection of Information Technology Equipment m) ANSI/ATIS-0600404.2002(R2006), Network and Customer Installation Interfaces DS3 and Metallic Interface Specification n) ASHRAE, Guidelines for Data Processing Environments, Second Edition, 2009 o) ASHRAE 2011 Thermal Guidelines for Data Processing Environments Expanded Data Center Classes and Usage Guidance, 2011 p) OSHA CFR 1926.441, Battery Rooms and Battery Charging q) Telcordia GR-63-CORE, NEBS(TM) Requirements: Physical Protection r) Telcordia GR-139-CO
