The American standard ANSI / TIA-942-B Telecommunications Infrastructure Standard for Data Centers, published in 2017, contains requirements and recommendations for the telecommunications infrastructure of a data center, including cables and connecting equipment, cable routes, telecommunications facilities.
Appendix F to this standard describes 4 levels of reliability of the data center infrastructure (1st basic, 2nd with redundancy, 3rd continuous service, 4th fault-tolerant) and published tables with records of data center reliability levels: telecommunication system ( Table 11), architecture (Table 12) + added entries on safety, power supply and power distribution system (Table 13), and mechanical data center systems (cold supply, security, fire extinguishing, fuel system) with entries in Table 14.
Where to buy the data center cabling standard guide?
On this link you can buy the original document
You can order an author’s high-quality translation of this standard.
Below is the detailed content of the TIA-942-B standard
LIST OF FIGURES 6
LIST OF TABLES 7
INTRODUCTORY PART 8
1 Scope 10
2 Normative references 10
3 Definitions, abbreviations and units of measure 11
3.1 General information 11
3.2 Definitions 11
3.3 Symbols and abbreviations 18
3.4 Units 20
4 Data Center Design Overview 21
4.1 General 21
4.2 Interconnection of rooms and spaces in a data center 22
4.3 Accessibility and security 22
4.4 Engaging professionals 23
5 Data center cabling infrastructure 24
6 Data center telecommunication spaces and topologies 27
6.1 General 27
6.2 Data center structure 27
6.2.1 Main elements 27
6.2.2 Basic Data Center Topology 30
6.2.3 Simplified Data Center Topology 31
6.2.4 Distributed Data Center Topology 32
6.2.5 Topology for distribution of broadband coaxial cables 33
6.3 Designing for Energy Efficiency 33
6.3.1 General 33
6.3.2 Energy efficiency recommendations 33
126.96.36.199 General 33
188.8.131.52 Telecommunication cabling 33
184.108.40.206 Telecommunication channels 35
220.127.116.11 Telecommunication spaces 36
6.4 General requirements for the server room and for the input room 37
6.4.1 General 37
6.4.2 Architectural design 37
18.104.22.168 Location 37
22.214.171.124 Dimensions 37
126.96.36.199 Guidelines for other equipment 38
188.8.131.52 Ceiling height 38
184.108.40.206 Lighting 38
220.127.116.11 Doors 39
18.104.22.168 Floor load 39
22.214.171.124 Plywood Sheets 39
126.96.36.199 Uninterruptible power supply notification 40
188.8.131.52 Signs (symbols, inscriptions) 40
184.108.40.206 Accounting for seismic conditions 40
6.4.3 Environmental requirements 40
220.127.116.11 Environment 40
18.104.22.168 Contaminants 40
22.214.171.124 Heating, ventilation and air conditioning 40
126.96.36.199 Radio sources 41
188.8.131.52 Batteries 41
184.108.40.206 Vibration 41
6.4.4 Power design 41
220.127.116.11 Power supply 41
18.104.22.168 Standby power supply 41
22.214.171.124 Grounding and grounding 41
6.4.5 Fire protection system 42
6.4.6 Water penetration 42
6.4.7 Access 42
6.5 Server room requirements 42
6.5.1 General 42
6.5.2 Location 43
6.5.3 Microclimate 43
6.5.4 Power System Design 43
6.6 Requirements for the entrance area 43
6.6.1 General 43
6.6.2 Location 44
6.6.3 Number 44
6.6.4 Laying an external circular duct under a raised floor 44
6.6.5 Access Provider and Service Provider Premises 45
6.6.6 Building 45 Entrance Terminal
6.6.7 Architectural design 45
126.96.36.199 General 45
188.8.131.52 Dimensions 45
184.108.40.206 Climate planning 46
220.127.116.11 Electrical network design 46
6.7 Main Distribution Area (MDA) 46
6.7.1 General 46
6.7.2 Location 46
6.7.3 Room requirements 47
6.8 Intermediate distribution area (IDA) 47
6.8.1 General 47
6.8.2 Location 47
6.8.3 Equipment requirements 47
6.9 Horizontal distribution area (HDA) 48
6.9.1 General 48
6.9.2 Location 48
6.9.3 Equipment requirements 48
6.10 Zonal distribution area (ZDA) 49
6.11 Hardware Distribution Area (EDA) 49
6.12 Telecommunication room 49
6.13 Data Center Ancillary Areas 49
6.14 Racks and Cabinets 50
6.14.1 General 50
6.14.2 Hot and cold aisles 50
6.14.3 Positioning in relation to raised floor tiles 51
6.14.4 Cutouts in raised floor tiles 51
6.14.5 Installing racks on a raised floor 52
6.14.6 Racks and cabinets in the entry room, in the main, intermediate and horizontal distribution areas 52
7 Data center cabling 54
7.1 General 54
7.2 Cable selection among transmission 54
7.2.1 General 54
7.2.2 Requirements for fire resistance of cables 54
7.3 Horizontal cabling 54
7.3.1 General 54
7.3.2 Topology 55
7.3.3 Horizontal cabling length 56
7.3.4 Direct cable connection 56
7.3.5 Recognized transmission medium 56
7.3.6 Fiber Optic Connectors 57
7.3.7 Coaxial Cable Connectors 57
7.4 Backbone cabling 57
7.4.1 General 57
7.4.2 Topology 58
18.104.22.168 Star topology 58
22.214.171.124 Susceptibility to configurations not using star topology 59
7.4.3 Redundant Cabling Topologies 59
7.4.4 Officially recognized transmission media 60
7.4.5 Fiber Optic Connectors 60
7.4.6 Coaxial Cable Connectors 60
7.4.7 Trunk cabling length 60
7.5 Centralized Fiber Optic Cabling 61
7.5.1 General 61
7.5.2 Implementation 61
7.6 Wiring transmission performance and test requirements 61
7.6.1 General 61
7.6.2 Additional requirements for on-site testing of 75 Ω coaxial cabling 61
8 Data center cabling 63
8.1 General 63
8.2 Data Center Cabling Security 63
8.3 Separation of telecommunication cables 64
8.3.1 Separation between power or luminaire cables and balanced twisted pair cables 64
8.3.2 Separating Optical and Balanced Twisted Pair Cabling 65
8.4 External cable routes for telecommunications 65
8.4.1 Types of external cabling 65
8.4.2 Variety 65
8.4.3 Sizing 65
8.5 Raised floors 66
8.5.1 General 66
8.5.2 Requirements for the performance of raised floors 66
8.5.3 Raised floor tile cutouts 66
8.6 Cable routes 67
8.6.1 General 67
8.6.2 Raised floor cable routes 67
8.6.3 Overhead Cable Trays 68
8.6.4 Coordination of cable routes 68
9.1 Introduction 69
9.2 Back-up process wells and external cable routes 70
9.3 Backup services of access providers 70
9.4 Reserving the input room 71
9.5 Redundant main distribution area (MDA) 71
9.6 Redundant Backbone Cabling 71
9.7 Redundant horizontal cabling 72
10 Requirements for cabling 72
11 Performance requirements for cabling 72
12 Cabling for smart building systems 72
13 Wiring for Wireless Access Points 72
14 Distributed antenna cabling 72
15 Power transmission over twisted pair cable 72
16 Grounding and Grounding 72
17 Fire extinguishing system 73
18 Physical security 73
19 Administration 73
Appendix A (INFORMATIVE) Consideration in the design of the cabling system 74
Appendix B (INFORMATIVE) Access Providers 82
Appendix C (INFORMATIVE) Alignment of equipment layouts 90
Appendix D (INFORMATIVE) Sizing Data Center 91
Appendix E (INFORMATIVE) Data Center Site Selection and Building Design 93
Appendix F (INFORMATIVE) Data Center Infrastructure Reliability Levels 97
Appendix G (INFORMATIVE) Data Center Project Examples 124
Appendix H (INFORMATIVE) Cabling Guide for Networked Fabrics 129
Appendix I (INFORMATIVE) BIBLIOGRAPHY 146
Figure 1: Illustrative representation between the ANSI / TIA-568 series and other TIA-related standards 9Figure 2: Interconnection of Rooms and Spaces in a Data Center 22
Figure 3: Functional Elements of Basic Cabling Topology 24
Figure 4: Examples of direct connection and cross connection for Valve A 25
Figure 5: Example of a Typical Data Center Topology 26
Figure 6: Example of a Basic Topology in a Data Center 30
Figure 7: Example of a simplified topology in a data center 31
Figure 8: Example of a Distributed Data Center Topology with Multiple Input Rooms 32
Figure 9: Examples of cable routing and air flow 35
Figure 10: Example of hot aisles, cold aisles and cabinet layouts 51
Figure 11: Cutout in tile 52
Figure 12: Typical Horizontal Cabling Using 55 Star Topology
Figure 13: Typical Backbone Cabling Using Star 59
Figure 14: Telecommunication cabling and room and area redundancy 69
Figure 15: Connection of cable and modular jack according to scheme T568A for 8 pins 85
Figure 16: Connection of cable and modular jack according to diagram T568B for 8 pins 86
Figure 17: Server Room Layout Showing Hot and Cold Aisles 124
Figure 18: Example of a corporate data center 126
Figure 19: Example of Internet Data Center 128
Figure 20: Example of Traditional 3-Tier Network Architecture in a Data Center 129
Figure 21: Example Cabling According to ANSI / TIA-942-B 131
Figure 22: Examples of redundant connections 132
Figure 23: Example Thick Tree Network Fabric Architecture 133
Figure 24: Example of a Thick Tree Network Fabric Architecture with Network Ports Outlined 135
Figure 25: Example Structured Cabling for Thick Tree Network Fabric Architecture 136
Figure 26: Example of a Fat Tree Network Fabric Switch Fabric Connection 137
Figure 27: Example of Fully Connected Network Fabric 138
Figure 28: Example of Using Structured Cabling for a Fully Connected Fabric 139
Figure 29: Example Architecture for Converged Mesh Fabrics 140
Figure 30: Example of using structured cabling for interconnected mesh fabrics 141
Figure 31: Example of a Centralized Network Architecture 142
Figure 32: Example Structured Cabling for a Centralized Network Architecture 143
Figure 33: Example of Virtual Network Architecture 144
Figure 34: Example Cabling for Virtual Network Architecture 145
Table 1: Dimensions of cable routes with circular cross-section 16
Table 2: Maximum Insertion Loss for Coaxial Cable 62
Table 3: Maximum lengths of communication lines without DSX panel 74
Table 4: Reduction of maximum line lengths due to the presence of a DSX client panel 75
Table 5: Reduction of maximum line lengths per connection or socket 75
Table 6: Maximum Line Lengths for Typical Data Center Configuration 76
Table 7: Maximum Trunk Length for Typical Data Center Configuration 76
Table 8: Maximum line lengths with baluns excluding insertion loss of baluns 78
Table 9: Decrease in maximum line length by 1 dB of insertion loss for a pair of baluns 78
Table 10: Decrease in maximum link length for each additional twisted pair connection (after the first two) 78
Table 11: Reference Guide (Telecommunications Systems) 111
Table 12: Reference Manual (Architecture) 112
Table 13: Reference Manual (Electrical Systems) 117
Table 14: Reference Manual (Mechanical Systems) 121
1 area of use
This International Standard specifies the minimum requirements for the telecommunications infrastructure of data processing centers (DPCs) and server rooms, including data centers intended for one enterprise, as well as data centers for multiple enterprises. The topology described in this International Standard is intended for use in data centers of any size.
2 Normative references
The following referenced documents are indispensable for the application of this document. At the time of publication, all indicated revisions of the documents were valid. For dated references, only the edition cited applies, for undated references, the latest edition of the referenced document (including all amendments) applies:
ANSI / ATIS 0600404: 2005 Network and Customer Installation Interfaces – DS3 and Metallic Interface Specification
ANSI / NFPA 75-2017 Standard for the Protection of Information Technology Equipment®
ANSI / TIA-568.0-D-2015 Generic Telecommunications Cabling for Customer Premises
ANSI / TIA-568.1-D-2015 Commercial Building Telecommunications Cabling Standard;
ANSI / TIA-568-C.2-2009 Balanced Twisted-Pair Telecommunications Cabling and Components Standard;
ANSI / TIA-568.3-D-2016 Optical Fiber Cabling Components Standard
ANSI / TIA-568.4-D-2017 Broadband Coaxial Cabling and Components Standard (Standard for components and cabling with broadband coaxial cables);
ANSI / TIA-569-D-2015 Telecommunications Pathways and Spaces
ANSI / TIA-604.5-E-2015 FOCIS 5 Fiber Optic Connector Intermateability Standard, Type MPO;
ANSI / TIA / EIA-604-10-B-2008 FOCIS 10 Fiber Optic Connector Intermateability Standard, Type LC (Fiber Optic Connector Intermate Standard, LC Type);
ANSI / TIA / EIA-604-18-2015 FOCIS 18 Fiber Optic Connector Intermateability Standard, Type MPO-16 (Type MPO-16)
ANSI / TIA-606-C-2017 Administration Standard for Telecommunications Infrastructure
ANSI / TIA-607-C-2015 Telecommunications Bonding and Grounding (Earthing) for Customer Premises (Telecommunications bonding and grounding for customer premises);
ANSI / TIA-758-B-2012 Customer – Owned Outside Plant Telecommunications Infrastructure Standard;
ANSI / TIA-862-B-2016 Structured Cabling Infrastructure Standard for Intelligent Building Systems
ANSI / TIA-5017-2016 Telecommunications Physical Network Security Standard;
ANSI / TIA-5048-2017 Automated Infrastructure Management (AIM) Systems – Requirements, Data Exchange and Applications
OSHA CFR 1926.4416 Battery Rooms and Battery Charging;
Telcordia GR-63-CORE NEBS ™ Requirements: Physical Protection ;
Telcordia GR-3175-2014 Generic Requirements for Intrabuilding Coaxial Cable .
3 Definitions, abbreviations and units
3.1 General information
The basic definitions in this paragraph have been formulated for application in a series of telecommunications standards.
Administration : The method of labeling, identifying, documenting and using that is necessary to effect movements, additions and changes to telecommunications infrastructure.
Hardware distribution area ( equipment distribution area ) : The space in the server room, occupied by a rack or cabinet with the equipment.
Hardware outlet (equipment outlet): The most remote connecting hardware in a hierarchical star topology.
Equipment room (telecommunications): A centralized environment with a controlled environment in which communications equipment is located; usually there is the main (main) or intermediate cross-panel.
Apparatus cord (equipment cord): cable with a plug at one or both ends.
Blocking switch fabric: A network fabric that does not have sufficient bandwidth for any port to communicate with any other port in a full bandwidth network fabric on any port.
External network interface : The interface between the server room cabling and the external cabling.
Removal of the port (port extender): The device which provides additional ports the switch to which it is connected.
Wireless : The use of electromagnetic energy (eg radio frequency or microwave signals, light) to transmit information as it travels through space.
Sealing block (termination block): The connecting equipment, which is used for cable termination and cable management via jumpers.
Virtual switch fabric: A network topology in which a network fabric is formed from many interconnected switches that form one large switch.
Moisture resistant (liquid tight): impermeable to humidity.
Main distribution area (MDA) : The space in the server room where the main distribution frame is located.
Main cross-connect: Cross-connection for the first level trunk cables, external cables and equipment cables, Distributor C.
Horizontal cabling : Cabling Subsystem 1.
Horizontal cross-connect: Distributor A.
Horizontal distribution area: The space in the data center where the horizontal crossbar is located.
Ground : A conductive connection, either intentionally or accidentally, between an electrical line (such as a communication line) or equipment and earth or some electrically conductive body that replaces earth.
Earthing, grounding: The act of creating a ground.
Grounding conductor : A conductor used to connect the grounding electrode to the main grounding bus of a building.
Bonding : Permanent bonding of metal parts to form an electrically conductive path.
Zone distribution arealocation in a server room where an area outlet or consolidation point is located.
Identifier : An item of information that links a specific element of the telecommunications infrastructure to a corresponding record.
Isolation (compartmentalization) – Create a physical barrier between two or more parts, which have separate cooling and extinguishing system.
Infrastructure (telecommunications) : A set of telecommunications components, excluding equipment, which together provide the underlying support for the distribution of information within a building and complex.
Uninterruptible power supplyinterruptible power supply between a city power supply system or other power supply and a load requiring a continuous power supply at precisely controlled parameters.
Cable : A shielded assembly of one or more insulated wires or optical fibers.
Cabling Subsystem 1 (Cabling Subsystem 1): cabling equipment from the socket to distributor A, the distributor B, or C. distributor
Cabling Subsystem 2 (Cabling Subsystem 2) cabling between the distributor and the distributor A B or A between the distributor and the distributor C (dispenser if B is not implemented).
Cabling Subsystem 3 (Cabling Subsystem 3) cabling between the distributor B and distributor C.
Cabling : The collection of all cables, jumpers, cords, and connecting hardware.
Cabling direct connection (direct attach cabling): cabling, which connects the equipment without the use of any connecting devices. Note – In the previous version of the standard, this connection was called point-to-point cabling.
Pathway : A device for placing a telecommunication cable.
Circular cable route (conduit): (1) Round cable route; (2) a structure containing one or more pipes.
NOTE For the purposes of this standard, the term circular conduit includes electrical metal pipe or electrical non-metal pipe.
Channel : The complete signal path between two points to which the equipment of a particular application is connected.
Switch aggregation (aggregation switch): switch that aggregates network traffic to and from the access switches, and can also be connected to network devices (e.g., such as load balancers, network applications, firewalls).
Access Switch (access switch): The switch is used to connect devices such as a server, to a local area network.
Interconnection switch: A switch used to connect access switches, or directly connect low-level switches in a network fabric.
A switch core (core switch): Bulk upper layer network switch.
The patch panel (patch panel): The coupling equipment which eases touched cables and control cabling using patch cords.
Patch cable (patch cord): The cord used for the connection on the circuit panel.
Consolidation point : A connector within Cable Subsystem 1 used to directly connect cables running along building cable runs to equipment outlets.
Box for pulling cables (pull box): Cavity (box, cover), arranged in the cable track for wires or cables.
Cross -connect: A device that terminates cable elements and enables them to be directly or cross-connected.
Cross-connection : A diagram of how sections of a cabling system, subsystems and equipment are connected using patch cords or jumpers that are attached to cable connectors on each side.
The communication link (link): signal transmission path between two points, not including equipment and cords.
Backbone : A device (for example, a cable run, cable or ground conductor) for Cable Subsystem 2 and
Cable Subsystem 3.
Backbone cable : See Backbone .
Position input (telecommunications ) (entrance point (telecommunications), telecommunications entrance point): The entry point for telecommunications cabling through the outer wall, floor or round cross section of the cable route.
Multimode optical fiber: An optical fiber (light guide) in which a light signal travels along different paths.
Modular jack: A female telecommunication connector with or without a key guide, having 6 or 8 contact positions, but not all positions can be fitted with contacts.
Continuous service (concurrently maintainable): The ability to perform routine maintenance at any time and in any part of the path, equipment or system component without interrupting system operation.
Return loss : The ratio of the power of the original signal to the power of the reflected signal, expressed in dB.
Common equipment room (telecommunications): An enclosed space used to house equipment and connect the trunk lines of multiple buildings or complex.
Single -mode optical fiber (single-mode): An optical fiber in which a light signal travels along a single path.
Optical fiber cable: An assembly consisting of one or more optical fibers.
Fiber optic (optical fiber): Any filament made of dielectric materials that conducts light.
Fault tolerant: The ability to withstand one fault.
Jumper : (1) An assembly of twisted-pair wires without connectors, used to connect telecommunication lines at a distribution frame; (2) assembling a fiber optic cable with a connector at each end (the word cord is often used for this term).
Plenum : A compartment or chamber to which one or more ducts are connected and which forms part of the air distribution system.
Full mesh network Factory (full-mesh, fabric): The topology of the network factory, where each switch is directly connected to all other switches in the network.
The room entry (entrance room): The space in which the connection is internal or external main telecommunication cabling a building.
Room for mechanical equipment (mechanical room): Closed space for maintenance of the building mechanical systems.
Port : A connection point for one or more conductors or fibers.
Service provider: An operator of any service that delivers telecommunications content (i.e., transfers) through an access device.
Prestressed concrete (post-tensioned concrete): Type concrete structure in which the first stretch embedded steel elements, then poured concrete which must solidify and discharged voltage of steel elements, causing compression of the concrete.
Prestressed floor (post-tension floor): Sex made of prestressed concrete.
Service access (access provider): The operator of any apparatus used for the signaling connection to the user premises and back.
Wire : Individually insulated metallic conductor, solid or stranded.
Intermediate distribution area: The location in the data center where the intermediate distribution frame is located.
Intermediate cross-connect: Cross-connection between the main wiring of the first and second level, valve B.
Spanning Tree Protocol ( STP ): A communications control protocol that provides link redundancy by preventing unwanted network rings from forming.
Interconnection : An interconnection scheme that uses interconnection equipment to directly connect a cable to another cable, without a switch cord or jumper, or use a cord or jumper to connect interconnecting equipment and active equipment.
Radio frequency interference: Electromagnetic interference in the frequency band intended for the transmission of radio signals.
The dimensions of the cable of circular section track (conduit sizes): For the purposes of this standard size round cable routes are designated according to the metric system the size designation and trade dimensions, as shown below:
Table 1 : Dimensions of cable routes with circular cross-section
|Metric size designation||Trade sizes|
A distributor (Distributor A): Auxiliary coupling device in a hierarchical star topology which connects a cable between the socket and the hardware of the distributor B and distributor C.
Distributor B : An additional intermediate connection device in a hierarchical star topology that is cabled to Distributor C.
Distributor C (Distributor C): The central connecting device in a hierarchical star topology.
Server room (computer room): Architectural space that is designed primarily to be placed in it data-processing equipment.
Network full mesh network of factories (interconnected mesh fabric): The topology of the network factory, in which each part of the data center includes a full mesh network of the factory, and data centers are connected by interconnect switches.
Factory network (switch fabric): Network topology in which devices are connected to one another using the network switches with multiple communication channels.
Network Factory “thick tree» (FAT-tree, fabric or the leaf and spine switch fabric architecture): The topology of connections of network switches in which each access switch connected to each interconnect switch.
The coupling equipment (connecting hardware): The device providing a mechanical cable terminations.
Transmission media (Telecommunications) (media (telecommunications), telecommunications media): wire, cable, or conductors used for communication.
Splice : A connection of conductors assumed to be permanent.
Rack : A support frame fitted with side rails to which apparatus and equipment are attached.
Telecommunications : The transmission and reception of information using wired, radio, optical or other electromagnetic systems.
Telecommunications room : Closed architectural space for placing telecommunications equipment, terminating cables and cross-panels of the cable system.
Telecommunications space : The area used to house the installation and termination of telecommunications equipment and cables.
Dry -bulb temperature: Air temperature measured with a thermometer exposed freely to the air, but protected from radiation (such as sunlight, radiated heat) and moisture.
Topology : The physical or logical organization of a telecommunications system.
Star topology: A topology in which telecommunication cables are distributed from a central location.
Demarcation point: The point at which operational management or ownership changes.
Dew point: The temperature at which the air must cool (at constant air pressure and moisture content) to reach 100% relative humidity (i.e. saturation).
PBX (private branch exchange): Enterprise switching system of automatic telephone.
Raised floor (access floor): A system consisting of completely removable and interchangeable floor tiles, based on the adjustable stand or stringers (or on it, and on the other) and provide access to the space under the floor.
Data center, data center: A building (or part of it), the main function of which is that in this part there is a server room and auxiliary (utility) rooms.
Centralized cabling : Configuration of cabling from the workstation to a centralized cross-connect in Distributor B or Distributor C using continuous cables, direct connection or splice.
Centralized switch fabric: A network fabric architecture in a data center in which the network fabric is implemented in a single centralized switch.
Part of the data center (pod, data center): A modular subset of the data center.
Cabinet : A container that may contain connectors, terminations, hardware, wiring, and equipment.
Cord (telecommunications) : A cable assembly with a plug at one or both ends.
Screen : An element of a cable formed by the shielding layer of its sheath.
Shield : (1) A layer of metal placed around a conductor or group of conductors; (2) A cylindrical outer conductor with the same axis as the center conductor, which together form a coaxial transmission line.
Electromagnetic interferenceradiated or conducted electromagnetic energy that adversely affects electronic equipment or signal transmission.
3.3 Data Center Cabling Standards Symbols and abbreviations
UPS : Uninterruptible Power Supply
HVAC : Heating, ventilation and air conditioning
Data Center: Data Center
AHJ (authority having jurisdiction): Authority having jurisdiction
ANSI (American National Standards Institute): American National Standards Institute
ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers): American Society of Heating, Refrigerating and Air Conditioning Engineers
BNC (bayonet Neill-Concelman): Bayonet center connector
CCTV (closed-circuit television): Closed circuit television (no broadcast)
CER (common equipment room): Common equipment room
CP (consolidation point): Consolidation point
CPU (central processing unit): Central processing unit
CSA (Canadian Standards Association International): Canadian International Standards Association
DSX (digital signal cross-connect): Cross for digital signal
EDA (equipment distribution area): Hardware distribution area
EMI (electromagnetic interference): Electromagnetic interference
EMS (energy management system): Energy management system
ENI (external network interface): External network interface
EO (equipment outlet): Hardware outlet
HC (horizontal cross-connect): Horizontal cross
HDA (horizontal distribution area): Horizontal distribution area
HVAC (heating, ventilation and air conditioning): Heating, ventilation and air conditioning.
IC (intermediate cross-connect): Intermediate cross
IDA (intermediate distribution area): Intermediate distribution area
IDC (insulation displacement contact): Insulation displacement contact
KVM (keyboard, video, mouse): Keyboard, video, mouse
LAN (local area network): Local (computer) network
LFMC (liquid tight flexible metallic conduit): Flexible metal conduit for liquids
LFNC (liquid tight flexible non-metallic conduit): Flexible non-metallic conduit for liquids
MC (maincross-connect): Main cross
MDA (main distribution area): Main distribution area (MDA)
The NEC ® (National Electrical Code®): National Electrical Code ® (a set of rules and regulations)
NEMA (National Electrical Manufacturers Association): National Association of Electrical Industrialists
NFPA (National Fire Protection Association): National Fire Protection Association
OSHA (Occupational Safety and Health Administration): Occupational Safety and Health Administration
PBX (private branch exchange): Corporate telephone exchange, PBX (with outgoing and incoming communication (with the city))
PDU (power distribution unit): Power distribution unit
Pod (portion of data-center): Part of the data center.
RFI (radio frequency interference): Radio frequency interference
SAN (storage area network): storage area network
SDH (synchronous digital hierarchy): Synchronous digital hierarchy, SDH standard (European standard for optical fiber transmission media)
SONET (synchronous optical network): Synchronous optical network
STM (synchronous transport model): Synchronous transport model
TIA (Telecommunications Industry Association): Telecommunications Industry Associations (North America)
TNC (threaded Neill-Concelman): Threaded Neill-Concelman
TR (telecommunications room): Hardware communication system
UL (Underwriters Laboratories Inc): Safety Laboratory, UL, USA
UPS (uninterruptible power supply): Uninterruptible Power Supply
WAN (wide area network): A wide area network (a network that provides information transfer using dial-up or leased lines or special communication channels)
ZDA (zone distribution area): Zonal distribution area