Data Center

TIA-942-B 2017 Data Center Cabling Standards Guidelines

data center cabling standards

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.

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Below is the detailed content of the TIA-942-B standard





Scope 10

Normative references 10

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

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

Data center cabling infrastructure 24

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 General 33 Telecommunication cabling 33 Telecommunication channels 35 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 Location 37 Dimensions 37 Guidelines for other equipment 38 Ceiling height 38 Lighting 38 Doors 39 Floor load 39 Plywood Sheets 39 Uninterruptible power supply notification 40 Signs (symbols, inscriptions) 40 Accounting for seismic conditions 40

6.4.3 Environmental requirements 40 Environment 40 Contaminants 40 Heating, ventilation and air conditioning 40 Radio sources 41 Batteries 41 Vibration 41

6.4.4 Power design 41 Power supply 41 Standby power supply 41 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 General 45 Dimensions 45 Climate planning 46 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

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 Star topology 58 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

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

Data center redundancy 69

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


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.

3.2 Definitions

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 : Dimensions of cable routes with circular cross-section

Metric size designation Trade sizes
sixteen ½
21 ¾
27 1
35 1 ¼
41 1 ½
53 2
63 2 ½
78 3
91 3 ½
103 4
129 five
155 6

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.

  1. 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

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