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TIA-942-B-2017.pdf
ANSI/TIA-942-B-2017
APPROVED: JULY 12, 2017
Telecommunications Infrastructure
Standard for Data Centers
TIA-942-B
(Revision of TIA-942-A)
July 2017
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Telecommunications Infrastructure Standard
ANSI/TIA-PN-942-B
for Data Centers
Table of Contents
1
2
3
4
5
6
SCOPE .................................................................................................................................. 1
NORMATIVE REFERENCES ................................................................................................ 1
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 ............................................................................................. 7
3.4 Units of measure ............................................................................................................... 8
DATA CENTER 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
DATA CENTER CABLING SYSTEM INFRASTRUCTURE ............................................... 12
DATA CENTER TELECOMMUNICATIONS SPACES AND RELATED TOPOLOGIES ... 15
6.1 General............................................................................................................................ 15
6.2 Data center structure ....................................................................................................... 15
6.2.1 Major elements ........................................................................................................ 15
Basic data center topology ...................................................................................... 16
6.2.2
Reduced data center topologies .............................................................................. 17
6.2.3
6.2.4
Distributed data center topologies ........................................................................... 17
Topologies for broadband coaxial cabling ............................................................... 18
6.2.5
6.3 Energy efficient design .................................................................................................... 18
6.3.1 General .................................................................................................................... 18
6.3.2
Energy efficiency recommendations ........................................................................ 19
6.4 Common requirements for computer rooms and entrance rooms .................................. 22
6.4.1 General .................................................................................................................... 22
Architectural design ................................................................................................. 22
6.4.2
6.4.3
Environmental design .............................................................................................. 24
Electrical design ....................................................................................................... 24
6.4.4
6.4.5
Fire protection .......................................................................................................... 25
6.4.6 Water infiltration ....................................................................................................... 25
6.4.7
Access ..................................................................................................................... 25
6.5 Computer room requirements ......................................................................................... 25
6.5.1 General .................................................................................................................... 25
Location ................................................................................................................... 26
6.5.2
Environmental design - HVAC ................................................................................. 26
6.5.3
6.5.4
Electrical design ....................................................................................................... 26
6.6 Entrance room requirements........................................................................................... 26
6.6.1 General .................................................................................................................... 26
i
ANSI/TIA-PN-942-B
6.8
Location ................................................................................................................... 26
6.6.2
6.6.3 Quantity .................................................................................................................... 26
Entrance conduit routing under access floor ........................................................... 27
6.6.4
Access provider and service provider spaces ......................................................... 27
6.6.5
Building entrance terminal ....................................................................................... 27
6.6.6
6.6.7
Architectural design ................................................................................................. 27
6.7 Main distribution area ...................................................................................................... 28
6.7.1 General .................................................................................................................... 28
Location ................................................................................................................... 28
6.7.2
6.7.3
Facility requirements ................................................................................................ 28
Intermediate distribution area ......................................................................................... 28
6.8.1 General .................................................................................................................... 28
Location ................................................................................................................... 29
6.8.2
6.8.3
Facility requirements ................................................................................................ 29
6.9 Horizontal distribution area ............................................................................................. 29
6.9.1 General .................................................................................................................... 29
Location ................................................................................................................... 29
6.9.2
6.9.3
Facility requirements ................................................................................................ 29
6.10 Zone distribution area ..................................................................................................... 29
6.11 Equipment distribution areas .......................................................................................... 29
6.12 Telecommunications room .............................................................................................. 30
6.13 Data center support areas............................................................................................... 30
6.14 Cabinets and racks ......................................................................................................... 30
6.14.1 General .................................................................................................................... 30
6.14.2
"Hot" and "cold" aisles ............................................................................................. 30
6.14.3 Placement relative to floor tile grid ........................................................................... 31
6.14.4 Access floor tile cuts ................................................................................................ 31
6.14.5
Installation of racks on access floors ....................................................................... 32
6.14.6 Racks and cabinets in entrance room, MDAs, IDAs and HDAs .............................. 32
DATA CENTER CABLING SYSTEMS ............................................................................... 33
7.1 General............................................................................................................................ 33
7.2 Choosing media .............................................................................................................. 33
7.2.1 General .................................................................................................................... 33
7.2.2
Cable fire rating requirements ................................................................................. 33
7.3 Horizontal Cabling ........................................................................................................... 33
7.3.1 General .................................................................................................................... 33
Topology .................................................................................................................. 34
7.3.2
Horizontal cabling length ......................................................................................... 34
7.3.3
7.3.4
Direct attach cabling ................................................................................................ 34
7.3.5
Recognized media ................................................................................................... 35
7.3.6 Optical fiber connectors ........................................................................................... 35
7.3.7
Coaxial cable connectors ......................................................................................... 35
7.4 Backbone cabling ............................................................................................................ 36
7.4.1 General .................................................................................................................... 36
Topology .................................................................................................................. 36
7.4.2
Redundant cabling topologies ................................................................................. 37
7.4.3
7.4.4
Recognized media ................................................................................................... 37
7.4.5 Optical fiber connectors ........................................................................................... 38
Coaxial cable connectors ......................................................................................... 38
7.4.6
7.4.7
Backbone cabling lengths ........................................................................................ 38
7.5 Centralized optical fiber cabling ...................................................................................... 38
7.5.1 General .................................................................................................................... 38
Implementation ........................................................................................................ 38
7.5.2
7.6 Cabling transmission performance and test requirements ............................................. 38
7.6.1 General .................................................................................................................... 38
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