7/23/2019 273332598-TIA-568-B-1-5

1/28

TIA

STANDARD

Commercial Building Telecommunications Cabling

Standard Part 1: General Requirements

Addendum 5 Telecommunications Cabling for

Telecommunications Enclosures

TIA-568-B.1-5(Supplement to TIA/EIA-568-B.1)

TELECOMMUNICATIONS INDUSTRY ASSOCIATION

Representing the telecommunications industry in

association with the Electronic Industries Alliance

ANSI/TIA-568-B.1-5-2004Approved: March 18, 2004

http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

2/28

7/23/2019 273332598-TIA-568-B-1-5

3/28

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 andobtaining 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. 3-4425-AD5, formulated under the cognizance of the TIA TR-42

Committee on User Premises Telecommunications Cabling Infrastructure.)

Published by

TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2002

Standards and Technology Department2500 Wilson Boulevard

Arlington, VA 22201 U.S.A.

PRICE: Please refer to current Catalog of

TIA TELECOMMUNICATIONS INDUSTRY ASSOCIATION STANDARDS

AND ENGINEERING PUBLICATIONS

or call Global Engineering Documents, USA and Canada

(1-800-854-7179) International (303-397-7956)

or search online at http://www.tiaonline.org/standards/search_n_order.cfm

All rights reserved

Printed in U.S.A.

http://www.tiaonline.org/standards/search_n_order.cfmhttp://www.tiaonline.org/standards/search_n_order.cfm

7/23/2019 273332598-TIA-568-B-1-5

4/28

PLEASE!

DON'T VIOLATE

THE

LAW!

This document is copyrighted by the TIA and may not be reproduced without

permission.

Organizations may obtain permission to reproduce a limited number of copiesthrough entering into a license agreement. For information, contact:

Global Engineering Documents

15 Inverness Way East

Englewood, CO 80112-5704 U.S.A. or call

U.S.A. and Canada 1-800-854-7179, International (303) 397-7956

7/23/2019 273332598-TIA-568-B-1-5

5/28

NOTICE OF DISCLAIMER AND LIMITATION OF LIABILITY

The document to which this Notice is affixed has been prepared by one or more Engineering

Committees of the Telecommunications Industry Association (TIA). TIA is not the author of the

document contents, but publishes and claims copyright to the document pursuant to licenses and

permission granted by the authors of the contents.

TIA Engineering Committees are expected to conduct their affairs in accordance with the

TIA Engineering Manual (Manual), the current and predecessor versions of which are available at

http://www.tiaonline.org/standards/sfg/engineering_manual.cfm. TIAs function is to administer

the process, but not the content, of document preparation in accordance with the Manual and, when

appropriate, the policies and procedures of the American National Standards Institute (ANSI).

THE USE OR PRACTICE OF CONTENTS OF THIS DOCUMENT MAY INVOLVE THE

USE OF INTELLECTUAL PROPERTY RIGHTS (IPR), INCLUDING PENDING OR ISSUED

PATENTS, OR COPYRIGHTS, OWNED BY ONE OR MORE PARTIES. TIA MAKES NO

SEARCH OR INVESTIGATION FOR IPR. WHEN IPR CONSISTING OF PATENTS AND

PUBLISHED PATENT APPLICATIONS ARE CLAIMED AND CALLED TO TIAS

ATTENTION, A STATEMENT FROM THE HOLDER THEREOF IS REQUESTED, ALL IN

ACCORDANCE WITH THE MANUAL. TIA TAKES NO POSITION WITH REFERENCE TO,

AND DISCLAIMS ANY OBLIGATION TO INVESTIGATE OR INQUIRE INTO, THE SCOPE

OR VALIDITY OF ANY CLAIMS OF IPR.

ALL WARRANTIES, EXPRESS OR IMPLIED, ARE DISCLAIMED, INCLUDING

WITHOUT LIMITATION, ANY AND ALL WARRANTIES CONCERNING THE ACCURACY

OF THE CONTENTS, ITS FITNESS OR APPROPRIATENESS FOR A PARTICULAR PURPOSE

OR USE, ITS MERCHANTABILITY AND ITS NON-INFRINGEMENT OF ANY THIRD

PARTYS INTELLECTUAL PROPERTY RIGHTS. TIA EXPRESSLY DISCLAIMS ANY AND

ALL RESPONSIBILITIES FOR THE ACCURACY OF THE CONTENTS AND MAKES NO

REPRESENTATIONS OR WARRANTIES REGARDING THE CONTENTS COMPLIANCE

WITH ANY APPLICABLE STATUTE, RULE OR REGULATION.

TIA SHALL NOT BE LIABLE FOR ANY AND ALL DAMAGES, DIRECT OR

INDIRECT, ARISING FROM OR RELATING TO ANY USE OF THE CONTENTS

CONTAINED HEREIN, INCLUDING WITHOUT LIMITATION ANY AND ALL INDIRECT,

SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR

LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED

UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING

NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES IS A

FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESECONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS.

http://www.tiaonline.org/standards/sfg/engineering_%20manual.cfmhttp://www.tiaonline.org/standards/sfg/engineering_%20manual.cfmhttp://www.tiaonline.org/standards/sfg/engineering_%20manual.cfm

7/23/2019 273332598-TIA-568-B-1-5

6/28

7/23/2019 273332598-TIA-568-B-1-5

7/28

TIA-568-B.1-5

1

Telecommunications Cabling for Telecommunications EnclosuresAddendum 5 to ANSI/TIA/EIA-568-B.1

1 INTRODUCTION

The purpose of this addendum is to complement the recognition of TEs in TIA-569-B by providing

cabling requirements on when and where to use this space. This maintains structured cabling whileproviding additional flexibility offered by a TE in certain situations. Revisions are identified in thefollowing text with additions shown in bold italics and deletions shown as strikeout.

2 SCOPE

This Standard specifies minimum requirements for telecommunications cabling within an environmentthat uses telecommunications enclosures in its infrastructure. A telecommunications enclosure asdefined inANSI/TIA/EIA-569-B is a case or housing that is dedicated to the telecommunicationsfunction and related support facilities. Just like a telecommunications room, the telecommunicationsenclosure is a common access point for backbone and building pathways. The use oftelecommunications enclosures is a specific implementation and not a general case. Atelecommunications enclosure is intended to serve a smaller floor area than a telecommunications

room (see TIA-EIA 569-B). One must plan in advance if a telecommunications enclosure is neededand make sure that the introduction of this space will not create issues regarding the structuredcabling systems, the management and administration of the installation.

TEs may be used as an addition to the minimum requirements of TIA-569-B that require onetelecommunications room per floor and recommend an additional TR for each area up to 1000 m

2

(10000 ft2). The number of TRs required or recommended inTIA-569-B is not reduced by the use of

TEs. TEs may also be used for serving certain environments like classrooms, entrance lobbies, orhistoric buildings.

This Standard provides requirements to retain the integrity of a structured cabling system, when atelecommunications enclosure is required.

3 CLAUSE REVISIONS

1.5 Telecommunications cabling system structu re

Figure 1-1 illustrates a representative model for the various functional elements that comprise acommercial building telecommunications cabling system. It depicts the relationship between theelements and how they are configured to create a total system.

The elements of the telecommunications cabling system structure are:

a) Horizontal cabling(clause 4);

b) Backbone cabling (clause 5);

c) Work area (clause 6);

d) Telecommunications rooms and telecommunicationsenclosures(clause 7);

e) Equipment rooms(clause 8);

f) Entrance facilities (clause 9);and,

g) Administration.

http://tia-eia-568-b.1.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

8/28

TIA-568-B.1-5

2

NOTE Basic administrationinformation is covered in various locations throughoutthis Standard. Refer to ANSI/TIA/EIA-606-A for more information regardingadministration.

NOTES

1 This figure is not meant to be an all-inclusive representation of thetelecommunications cabling system and is provided only as a typical example.

2 All cross-connects located in the telecommunications rooms (TRs) andtelecommunications enclosures (TEs) in this figure are horizontal cross-connects(HCs).

Figure 1-1 Typical telecommunications cabling system

Building 2Building 3

Building 4

EF

InterbuildingBackboneCabling

Legend

Access provider AP

Entrance facility EF

Equipment room ER

Intermediate cross-connect IC

Main cross-connect MC

Telecommunications room TR

Telecommunications

Enclosure.TE

Work area WA

Telecommunicationsoutlet/connector

Cross-connect

Splice

Building 1

AP

HorizontalCabling

IntrabuildingBackbone Cabling

TR

ER/TR

IC

TR

MC

EF&

ERWA

TR

ICTE

EF

EF&

ERWA

TR

ICTR

EF&

ERWA

TE

ICTR

WA

http://tia-eia-606-a-final.pdf/http://tia-eia-606-a-final.pdf/http://tia-eia-606-a-final.pdf/

7/23/2019 273332598-TIA-568-B-1-5

9/28

TIA-568-B.1-5

3

3.2 Defini tion of terms

The generic definitions in this clause have been formulated for use by the entire family oftelecommunications infrastructure standards. Specific requirements are found in the normative clausesof this Standard. For the purposes of this Standard, the following definitions apply.

backbone: 1) A facility (e.g., pathway, cable or conductors) between any of the following spaces:telecommunications rooms, telecommunications enclosures, common telecommunications rooms,floor serving terminals, entrance facilities, equipment rooms, and common equipment rooms. 2) in adata center, a facility (e.g. pathway, cable or conductors) between any of the following spaces: entrancerooms or spaces, main distribution areas, horizontal distribution areas, telecommunications rooms.(TR-42.1.1)

building backbone: Pathways or cabling between telecommunications service entrance rooms,equipment rooms, telecommunications rooms, or telecommunications enclosureswithin a building.

centralized cabling: A cabling configuration from the work area to a centralized cross-connect usingpull through cables, an interconnect, or splice in the telecommunications room ortelecommunications enclosure.

enclosure, telecommunications: A case or housing for telecommunications equipment, cableterminations, or horizontal cross-connect cabling.

intrabuilding telecommunications backbone:This term is out dated term. See building backbone.

space (telecommunications): An area used for housing the installation and termination oftelecommunications equipment and cable, e.g., common equipment rooms, equipment rooms, commontelecommunications rooms, telecommunications rooms, telecommunications enclosures, workareas, and maintenance holes/handholes.

telecommunications enclosure: See enclosure, telecommunications .

3.3 Acronyms and abbreviations

TE telecommunications enclosure

7/23/2019 273332598-TIA-568-B-1-5

10/28

TIA-568-B.1-5

4

4.1 General

The horizontal cabling is the portion of the telecommunications cabling system that extends from thework area telecommunications outlet/connector to the horizontal cross-connect in thetelecommunications room or when used, in the telecommunications enclosure. The horizontalcabling includes horizontal cables, telecommunications outlet/connectors in the work area,

mechanical terminations, and patch cords or jumpers located in the telecommunications room orwhen used, in the telecommunications enclosure, and may include multi-usertelecommunications outlet assemblies and consolidation points.

NOTE - The term "horizontal" is used since typically the cable in this part of thecabling system runs horizontally along the floor(s) or ceiling(s) of a building.

The following list of common services and systems should be considered when the horizontal cablingis designed. (The list is not intended to be complete.)

a) Voice telecommunications service

b) Premises switching equipment

c) Data communications

d) Local area networks (LAN)

e) Video

f) Other building signaling systems (building automation systems such as fire, security, HVAC,EMS, etc.)

In addition to satisfying today's telecommunications requirements, the horizontal cabling should beplanned to reduce on-going maintenance and relocation. It should also accommodate futureequipment and service changes. After construction of the building, the horizontal cabling is often

much less accessible than the backbone cabling. The time, effort, and skills required for changescan be extremely high. In addition, access to the horizontal cabling frequently causes disruption tooccupants and their work. These factors make the choice and layout of horizontal cable types veryimportant to the design of the building cabling. Consideration should be given to accommodating adiversity of user applications in order to reduce or eliminate the probability of requiring changes to thehorizontal cabling as user needs evolve.

The pathways and spaces shall be designed and installed to support horizontal cabling in accordancewith the requirements of ANSI/TIA/EIA-569-AANSI/TIA/EIA-569-B .

4.2 Topology

The horizontal cabling shall be installed in a star topology as shown in figure 4-1. Each work area

telecommunications outlet/connector shall be connected to a horizontal cross-connect in atelecommunications room or when used, in the telecommunications enclosurevia the horizontalcable. A telecommunications room or when used, a telecommunications enclosure should belocated on the same floor as the work areas served.

Some networks or services require applications-specific electrical components (such as impedancematching devices). These application-specific electrical components shall not be installed as part ofthe horizontal cabling. When needed, such electrical components shall be placed external to thetelecommunications outlet/connector.

http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/

7/23/2019 273332598-TIA-568-B-1-5

11/28

TIA-568-B.1-5

5

Keeping application-specific components external to the telecommunications outlet/connector willfacilitate the use of the horizontal cabling for varying network and service requirements.

Horizontal cabling shall contain no more than one transition point or consolidation point between thehorizontal cross-connect and telecommunications outlet.

Bridged taps and splices shall not be installed as part of the copper horizontal cabling. Splitters shallnot be installed as part of the optical fiber horizontal cabling.

NOTES

1 Cabling between telecommunications rooms or telecommunicationsenclosuresfor the purpose of creating "bus" and "ring" topologies is considered partof the backbone cabling. The direct connections between nearbytelecommunications rooms or telecommunications enclosures are covered insubclause5.2.3.

2 Centralized optical fiber cabling is designed as an alternative to the opticalcross-connection located in the telecommunications room or telecommunicationsenclosures when deploying recognized optical fiber cable in the horizontal insupport of centralized electronics. Specifications concerning centralized cabling arefound inannex A.

Figure 4-1 Typical horizontal and work area cabling using a star topology

90 m (295 ft) Maximum

WA

TR/TEHorizontal

Cabling

Legend

X HC Horizontal cross-connect

Mechanical termination

Telecommunications outlet/connector

TR Telecommunications room

TE Telecommunications enclosure

Transition/consolidation pointWA Work area

4-pair UTP/ScTP

4-pair UTP/ScTP-or-

2-fiber multimode fiber

HC

WA

X

http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

12/28

TIA-568-B.1-5

6

4.3 Horizontal distances

The horizontal distance is the cable length from the mechanical termination of the media at thehorizontal cross-connect in the telecommunications room or telecommunications enclosureto thetelecommunications outlet/connector in the work area. The maximum horizontal distance shall be 90

m (295 ft), independent of media type (see figure 4-1). If a multi-user telecommunications outletassembly (MUTOA) is used, the maximum horizontal distances of copper media shall be reduced inaccordance with subclause6.4.1.4.

The length of the cross-connect jumpers and patch cords in the cross-connect facilities, includinghorizontal cross-connects, jumpers, and patch cords that connect horizontal cabling with equipmentor backbone cabling, should not exceed 5 m (16 ft) in length. For each horizontal channel, the totallength allowed for cords in the work area plus patch cords or jumpers plus equipment cables or cordsin the telecommunications room or telecommunications enclosureshall not exceed 10 m (33 ft),unless a multi-user telecommunications assembly is used (see subclauses6.4.1.4 and6.4.1.5).

NOTE In establishing the maximum distance for each horizontal channel, anallowance was made for 5 m (16 ft) from the telecommunications outlet/connector to

the workstation.

4.6 Grounding considerations

Grounding systems are an integral part of the signal or telecommunications cabling system that theysupport. In addition to helping protect personnel and equipment from hazardous voltages, a propergrounding system may reduce electromagnetic interference (EMI) to and from thetelecommunications cabling system. Improper grounding can produce induced voltages and thosevoltages can disrupt other telecommunications circuits.

Grounding and bonding shall meet the requirements and practices of applicable authorities or codes.In addition, telecommunications grounding/bonding shall conform to ANSI/TIA/EIA-607

ANSI/TIA/EIA-J-STD-607-Arequirements.

The screen of ScTP cables shall be bonded to a telecommunications grounding busbar (TGB).Grounding at the work area is usually accomplished through the equipment power connection.Shield connections at the work area are accomplished through an ScTP patch cord. At the work areaend of the horizontal cabling, the voltage measured between the shield and the ground wire of theelectrical outlet used to supply power to the workstation shall not exceed 1.0 V rms. The cause ofany higher voltage should be removed before using the cable.

5.1 General

The function of the backbone cabling is to provide interconnections between telecommunicationsrooms, telecommunications enclosures, equipment rooms, main terminal space and entrancefacilities in the telecommunications cabling system structure (see figure 1-1). Backbone cabling

consists of the backbone cables, intermediate and main cross-connects, mechanical terminations,and patch cords or jumpers used for backbone-to-backbone cross-connection. Backbone cablingalso includes cabling between buildings.

The backbone cabling is expected to serve the needs of building occupants for one or severalplanning periods, each period spanning three to ten years. During each planning period, thebackbone cabling design should accommodate growth and changes in service requirements withoutthe installation of additional cabling. The length of the planning period should be based upon thestability and growth of the end user organization.

http://tia-eia-568-b.1.pdf/http://j-std-607-a.pdf/http://j-std-607-a.pdf/http://j-std-607-a.pdf/http://tia-eia-568-b.1.pdf/http://j-std-607-a.pdf/

7/23/2019 273332598-TIA-568-B-1-5

13/28

TIA-568-B.1-5

7

In order to estimate the maximum amount of backbone cabling required, calculate the number offibers or copper pairs that will be required in each backbone segment to support the maximumnumber of users and simultaneous applications projected for the planning period of the cablingsystem. Estimate the size of the cross-connect facilities to accommodate the cable and number ofconnections required.

5.2.1 Star topo logy

The backbone cabling shall use the hierarchical star topology as illustrated by figure 5-1 whereineach horizontal cross-connect in a telecommunications room or telecommunications enclosure iscabled either directly to a main cross-connect or to an intermediate cross-connect, then to a maincross-connect. There shall be no more than two hierarchical levels of cross-connects in thebackbone cabling. From the horizontal cross-connect, no more than one cross-connect shall bepassed through to reach the main cross-connect. Therefore, connections between any two horizontalcross-connects shall pass through three or fewer cross-connect facilities (seefigure 5-1).

Backbone cabling cross-connects may be located in telecommunications rooms,telecommunications enclosures, equipment rooms, or at entrance facilities. Bridged taps andsplitters shall not be used as part of the backbone cabling.

NOTES

1 The topology required by this Standard has been selected because of itsacceptance and flexibility in meeting a variety of application requirements. Thelimitation to two levels of cross-connects is imposed to limit signal degradation forpassive systems and to simplify moves, adds and changes. This limitation may notbe suitable for facilities that have a large number of buildings or those that cover alarge geographical area, such as universities, industrial parks and military bases. Inthese cases, it may be necessary to divide the entire facility into smaller areas withinthe scope of this Standard and then connect these areas together.

2 The star topology is applicable to the individual units of the transmission medium,such as individual fibers or twisted-pairs. Depending on the physical characteristics

of a site and the facility architecture, cable sub-units that are terminated at differentlocations may be part of the same cable over a portion of the distance or may useindividual cables over the entire distance.

3 Centralized optical fiber cabling is designed as an alternative to the opticalcross-connection located in the telecommunications room or telecommunicationsenclosure when deploying recognized optical fiber to the work area from acentralized cross-connect. Specifications concerning centralized cabling are found inannex A.

http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

14/28

TIA-568-B.1-5

8

Figure 5-1 Backbone hierarchical star topology

5.2.2 Accommodation of non-star configurations

The topology in figure 5-1, through the use of appropriate interconnections, electronics, or adapters inthe telecommunications rooms or telecommunications enclosures, can often accommodatesystems that are designed for non-star configurations such as ring, bus, or tree.

5.2.3 Cabling direct ly between telecommunications rooms or telecommunicationsenclosures

If requirements for "bus" or "ring" configurations are anticipated, then cabling directly betweentelecommunications rooms or telecommunications enclosures is allowed. Such cabling is inaddition to the connections for the star topology specified in subclause 5.2.1. See

ANSI/EIA/TIA-569-AANSI/EIA/TIA-569-B for pathway considerations.

6.4.1 Multi-user telecommunications outlet assembly

HorizontalCabling

TR

HC

WA

TR

HC

WA

TE

HC

WA

TR

HC

WA

TR

HC

WA

TE

HC

WA

ER/TR

IC

ER

MC

BackboneCabling

Legend

Equipment room ER

Horizontal cross-connect HC

Intermediate cross-connect ICMain cross-connect MC

Mechanical termination

Telecommunications room TR

Telecommunications enclosure TE

Telecommunicationsoutlet/connector

Work area WA

TR

TR

http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/

7/23/2019 273332598-TIA-568-B-1-5

15/28

TIA-568-B.1-5

9

Multi-user telecommunications outlet assemblies (MUTOAs) may be advantageous in open officespaces that are moved or reconfigured frequently. A multi-user telecommunications outlet assemblyfacilitates the termination of single or multiple horizontal cables in a common location within afurniture cluster or similar open area. The use of multi-user telecommunications outlet assembliesallows horizontal cabling to remain intact when the open office plan is changed. Work area cablesoriginating from the multi-user telecommunications outlet assembly should be routed through workarea pathways (e.g., furniture pathways). The work area cables shall be connected directlyto work

station equipment without the use of any additional intermediate connections (seefigure 6-3).

Multi-UserTelecommunicationsOutlet Assembly

Telecommunications Room

or Telecommunications

Enclosure

Horizontal

cablesTelecommunication

outlet/connectors

Work Area

Work area cables

Patch cords/

jumperscable

Equipment

Backbonecable

Horizontal

cross-connect

Figure 6-3 Application of mul ti-user telecommunications outlet assembly

6.4.1.4 Maximum lengths for copper cabling

Copper work area cables used in the context of multi-user telecommunications outlet assemblies andopen office furniture, shall meet the requirements of ANSI/TIA/EIA-568-B.2. Based upon insertionloss considerations, the maximum length shall be determined according to:

C = (102 - H)/(1+D) (1)

W = C - T 22 m (72 ft)for 24 AWG UTP/ScTP or 17 m (56 ft) for 26 AWG ScTP (2)

Where:

C is the maximum combined length (m) of the work area cable, equipment cable, and patchcord.

H is the length (m) of the horizontal cable (H + C 100 m).

D is a de-rating factor for the patch cord type (0.2 for 24 AWG UTP/24 AWG ScTP and 0.5 for26 AWG ScTP).

W is the maximum length (m) of the work area cable

T is the total length of patch and equipment cords in the telecommunications room ortelecommunications enclosure.

http://tia-eia-568-b.2.pdf/http://tia-eia-568-b.2.pdf/http://tia-eia-568-b.2.pdf/

7/23/2019 273332598-TIA-568-B-1-5

16/28

TIA-568-B.1-5

10

Table 6-1 applies the above formulae assuming that there is a total of 5 m (16 ft) of 24 AWG UTP/24AWG ScTP or 4 m (13 ft) of 26 AWG ScTP patch cords and equipment cables in thetelecommunications room or telecommunications enclosure. The multi-user telecommunicationsoutlet assembly shall be marked with the maximum allowable work area cable length. One method toaccomplish this is to evaluate cable length markings.

Table 6-1 Maximum length of horizontal and work area cables

24 AWG UTP/24 AWG ScTPpatch cords

26 AWG ScTPpatch cords

Length ofhorizontal

cable

Maximumlength ofwork area

cable

Maximum combinedlength of work areacables, patch cords,and equipment cable

Maximumlength ofwork area

cable

Maximum combinedlength of work areacables, patch cords,and equipment cable

Hm (ft)

Wm (ft)

Cm (ft)

Wm (ft)

Cm (ft)

90 (295) 5 (16) 10 (33) 4 (13) 8 (26)

85 (279) 9 (30) 14 (46) 7 (23) 11 (35)

80 (262) 13 (44) 18 (59) 11 (35) 15 (49)

75 (246) 17 (57) 22 (72) 14 (46) 18 (59)70 (230) 22 (72) 27 (89) 17 (56) 21 (70)

6.4.2 Consol idation poin t

The consolidation point is an interconnection point within the horizontal cabling usingANSI/TIA/EIA-568-B.2 or ANSI/TIA/EIA-568-B.3 compliant connecting hardware installed inaccordance with the requirements ofclause 10 and rated for at least 200 cycles of reconnection. Itdiffers from the multi-user telecommunications outlet assembly in that it requires an additionalconnection for each horizontal cable run. Cross-connections shall not be used at a consolidationpoint. No more than one consolidation point shall be used within the same horizontal cable run. Atransition point and consolidation point shall not be used in the same horizontal-cabling link. Eachhorizontal cable extending to the work area outlet from the consolidation point shall be terminated toa telecommunications outlet/connector or multi-user telecommunications outlet assembly, provided

the requirements of subclause 6.4.1.4 and the transmission performance ofclause 11 are met. Thecables and connections used at a consolidation point shall meet the requirements of

ANSI/TIA/EIA-568-B.2 orANSI/TIA/EIA-568-B.3 and be installed in accordance with the requirementsofclause 10 (see figure 6-4).

For copper cabling, in order to reduce the effect of multiple connections in close proximity on NEXTloss and return loss, the consolidation point should be located at least 15 m (49 ft) from thetelecommunications room or telecommunications enclosure.

http://tia-eia-568-b.2.pdf/http://tia-eia-568-b.2.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.2.pdf/http://tia-eia-568-b.2.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.2.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.2.pdf/

7/23/2019 273332598-TIA-568-B-1-5

17/28

TIA-568-B.1-5

11

ConsolidationPoint

Telecommunications Room orTelecommunications Enclosure

Work Area

Work areacables

HorizontalCabling

Work area telecommunicationsoutlet/connector or multi-usertelecommunications outlet assembly

Connectinghardware

HorizontalCross-Connect

Backbonecable

Figure 6-4 Application of consolidation point

A consolidation point may be useful when reconfiguration is frequent, but not so frequent as torequire the flexibility of the multi-user telecommunications outlet assembly.

6.4.2.3 Administration

Consolidation points shall be administered in the same manner as connecting hardware described inANSI/TIA/EIA-606. Moves, adds, and changes of service not associated with open officerearrangements should be implemented at the horizontal cross-connect in the telecommunicationsroom or telecommunications enclosure.

7 TELECOMMUNICATIONS ROOMSAND TELECOMMUNICATIONSENCLOSURES

7.1 General

Telecommunications rooms (TRs) and telecommunications enclosures (TEs) provide manydifferent functions for the cabling system and are often treated as a distinct sub-system within thehierarchical cabling system described inclauses 4 and 5.

7.2 Design

Telecommunications rooms and telecommunications enclosures shall be designed andprovisioned according to the requirements in ANSI/EIA/TIA-569-AANSI/TIA/EIA-569-B .

7.3 Functions

The primary function of a telecommunications room or telecommunications enclosure is the

termination of horizontal and backbone cables to compatible connecting hardware. Thecross-connection of horizontal and backbone cable terminations using jumpers or patch cords allowsflexible connectivity when extending various services to telecommunications outlet/connectors.Connecting hardware, jumpers, and patch cords used for this purpose are collectively referred to ashorizontal cross-connections.

A telecommunications room may also contain the intermediate cross-connect or the maincross-connect for different portions of the backbone cabling system. Sometimesbackbone-to-backbone cross-connections in the telecommunications room or telecommunications

http://tia-eia-606-a-final.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-606-a-final.pdf/

7/23/2019 273332598-TIA-568-B-1-5

18/28

TIA-568-B.1-5

12

enclosureare used to tie different telecommunications rooms or telecommunications enclosurestogether in a ring, bus, or tree configuration as described in subclause5.2.2.

A telecommunications room or telecommunications enclosure also provides a controlledenvironment to house telecommunications equipment, connecting hardware, and splice closuresserving a portion of the building. The telecommunications room or telecommunications enclosureprovides for the administration and routing of the equipment cables/cords from the horizontal

cross-connect to the telecommunications equipment. In some cases, the demarcation point andassociated protection apparatus may be located in the telecommunications room.

7.4 Cross-connections and interconnections

Horizontal and backbone building cables shall be terminated on connecting hardware that meets therequirements ofANSI/TIA/EIA-568-B.2 andANSI/TIA/EIA-B.3. These cable terminations shall not berelocated to implement cabling system moves, adds, and changes. All connections betweenhorizontal and backbone cables shall be cross-connections.

NOTE Centralized optical fiber cabling is designed as an alternative to the opticalcross-connect located in the telecommunications room or telecommunicationsenclosure, when deploying recognized optical fiber cable in the horizontal in support

of centralized electronics. Specifications concerning centralized cabling are found inannex A.

Equipment cables/cords that consolidate several ports on a single connector shall be terminated ondedicated connecting hardware. Equipment cables/cords that extend a single port appearance mayeither be permanently terminated or interconnected directly to horizontal or backbone terminations.Direct interconnections reduce the number of connections in a link, but may reduce flexibility (seefigure 7-1).

http://tia-eia-568-b.2.pdf/http://tia-568-c.3.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.2.pdf/

7/23/2019 273332598-TIA-568-B-1-5

19/28

TIA-568-B.1-5

13

TELECOMMUNICATIONS ROOM OR

TELECOMMUNICATIONS ENCLOSURE

ConnectingHardware

Common Equipment

EquipmentCable

Connecting Hardware

EquipmentCable

PatchCord

Cross-connectionInterconnection

NOTE- Thehorizontal cabling toWork Area 1 is interconnected to thecommon equipment.

Telecommunications

outlet/connector

WORK AREA 1

Telecommunications

outlet/connector

WORK AREA 2

Horizontal Cabling

NOTE- The horizontal cabling toWork Area2 is cross-connectedto thecommon equipment.

Connecting Hardware

Figure 7-1 Illustration of interconnection and cross-connection schemes

11.2.3 Test configurations

This subclause is intended to specify requirements for field test instruments and procedures for fieldmeasurement practices that will yield repeatable measurements of installed 100 Ohm twisted-paircabling links.

7/23/2019 273332598-TIA-568-B-1-5

20/28

TIA-568-B.1-5

14

Channel and permanent link test configurations are defined in the following paragraphs. Othercompliant test configurations shall be tested using limits computed according tosubclause 11.2.4.

The channel test configuration is to be used by system designers and users of data communicationssystems to verify the performance of the overall channel. The channel includes up to 90 m (295 ft) ofhorizontal cable, a work area equipment cord, a telecommunications outlet/connector, an optionaltransition/consolidation connector, and two connections in the telecommunications room or

telecommunications enclosure. The total length of equipment cords, patch cords or jumpers andwork area cords shall not exceed 10 m (33 ft). The connections to the equipment at each end of thechannel are not included in the channel definition. The channel definition does not apply to thosecases where the horizontal cabling is cross-connected to the backbone cabling. See figure 11-1 for aschematic representation of a channel.

Figure 11-1 Schematic representation of a channel test configuration

The permanent link test configuration is to be used by installers and users of datatelecommunications systems to verify the performance of permanently installed cabling. A schematicrepresentation of the permanent link is illustrated in figure 11-2. The permanent link consists of up to90 m (295 ft) of horizontal cabling and one connection at each end and may also include an optionaltransition/consolidation point connection. The permanent link excludes both the cable portion of thefield test instrument cord and the connection to the field test instrument.

A B

C

D

LegendWork area cord AOptional transition cabling BHorizontal cabling CPatch cord or jumper cable DTelecommunications room

equipment cord E

Maximum lengthB+ C 90 m (295 ft)

A+ D+ E 10 m (32.8 ft)

Telecommunications

outlet/connector

End channel

Fieldtest

instrument

Fieldtest

instrument

E

Work area

Telecommunications room ortelecommunications enclosure

Horizontalcross-connector interconnect

Optional transition/consolidationpoint connector

Begin channel

http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

21/28

TIA-568-B.1-5

15

Figure 11-2 Schematic representation of a permanent link test configu ration

NOTE If cross-connections are used, then channel testing is recommended.

11.3.2 Link segment

An optical fiber link segment is the passive cabling, to include cable, connectors, and splices (ifpresent), between two optical fiber connecting hardware termination points as indicated in figure11-5. A typical horizontal link segment is from the telecommunications outlet/connector to thehorizontal cross-connect. There are three typical backbone link segments: main cross-connect to

intermediate cross-connect, main cross-connect to horizontal cross-connect, and intermediatecross-connect to horizontal cross-connect. Additionally, centralized optical fiber cabling provides alink from the telecommunications outlet to the centralized cross-connect through a splice orinterconnect in the telecommunications room or telecommunications enclosure. As figure 11-5illustrates, the test includes the representative connector performance at the connecting hardwareassociated with the mating of patch cords. It does not, however, include the performance of theconnector at the equipment interface.

Telecommunications

outlet/connector

End permanent link

Fieldtest

instrument

Fieldtest

instrument

F

H

F

Begin permanent linkWork area

Telecommunications room or

telecommunications enclosure

LegendTest equipment cord FOptional transition cabling GHorizontal cabling H

Maximum lengthG + H 90 m (295 ft)

Horizontalcross-connector interconnect

Optional transition/consolidationoint connector

G

http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/

7/23/2019 273332598-TIA-568-B-1-5

22/28

TIA-568-B.1-5

16

Figure 11-4 Optical fiber passive link

NOTES

1 Optical power budgets specified in application standards, such as FDDI,10BASE-F, and others, include the optical loss of the connector at the equipmentinterface.

2 If the desired system link is created by the concatenation of two (2) or morepassive link segments, i.e., a cross-connect patch cord linking cross-connects

together, then the expected attenuation for the system link is the sum of theconcatenated passive link segment attenuation.

11.3.3.3 Centralized opti cal fiber link measurement

The centralized optical fiber cabling link shall be tested at 850 nm or 1300 nm in one direction.Because of the short length of cabling (300 m [984 ft] or less), attenuation deltas due to wavelengthare insignificant. The centralized link shall be tested at 850 nm or 1300 nm (850 nm recommended)in one direction in accordance withANSI/EIA/TIA-526-14A,Method B, One Reference Jumper. Theattenuation test results shall be less than 3.3 dB. This value is based on the loss of three connectorpairs, one pair at the telecommunications outlet/connector, one pair at the interconnect center in thetelecommunications room or telecommunications enclosure, and one pair at the centralizedcross-connect, plus 300 m (984 ft) of optical fiber cable.

For centralized optical fiber cabling link segments implemented in conjunction with open officecabling with a consolidation point, the attenuation results shall be less than 4.1 dB.

http://tia-526-14.pdf/http://tia-526-14.pdf/http://tia-526-14.pdf/

7/23/2019 273332598-TIA-568-B-1-5

23/28

TIA-568-B.1-5

17

A.1 Int roduct ion

Many single tenant users of high performance optical fiber are implementing data networks withcentralized electronics versus distributed electronics in the building. Centralized optical fiber cablingis designed as an alternative to the optical cross-connection located in the telecommunications roomor telecommunications enclosurewhen deploying recognized optical fiber cable in the horizontal in

support of centralized electronics.

Centralized cabling provides connections from work areas to centralized cross-connects by allowingthe use of pull-through cables, an interconnect, or splice in the telecommunications room ortelecommunications enclosure.

The horizontal cross-connection as specified in clause 4, and clause 7 of this Standard andsubclause 5.4 ofANSI/TIA/EIA-568-B.3 provides the user with maximum flexibility, specifically in thedeployment of distributed electronics or in multi-tenant buildings.

Careful planning and implementation of centralized optical fiber cabling will help assure that the usermaintains adequate flexibility and manageability with the cabling network. Users of this Standard areadvised to consult with equipment manufacturers and system integrators to determine the suitabilityof these requirements for specific networking applications.

A.2 Appl icabi li ty

The guidelines and requirements for centralized optical fiber cabling networks are intended for thosesingle-tenant users who desire to deploy centralized electronics rather than distributed electronicsand want an alternative to locating the cross-connection in the telecommunications room ortelecommunications enclosure.

This annex specifies requirements for the connecting hardware and general implementationguidelines that will ensure adequate flexibility and manageability of optical fiber links including theability to migrate to a cross-connection located in the telecommunications room ortelecommunications enclosure, if required.

A.3 General guidel ines

This annex specifies the use of either pull-through cables, an interconnect, or splice in thetelecommunications room or telecommunications enclosure. The use of an interconnectionbetween the backbone and horizontal cabling is recognized to offer increased flexibility,manageability, and ease to migrate to a cross-connection (seefigure A-1).

http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/http://tia-568-c.3.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/

7/23/2019 273332598-TIA-568-B-1-5

24/28

TIA-568-B.1-5

18

Pos.

Interconnector Splice

Term. Pos.

Term. Pos.

Pull-through

Cable

Telecommunications RoomsorTelecommunications Enclosures

HorizontalCable

Pathway

Pathway

Term.

Term.

Hdwr.

Centralized

Cross-Connect

BackbonePathway

BackboneCable

Work Area

Equipment Room

Equipment

Work Area

Figure A-1 Centralized optical fiber cabling

The specifications of ANSI/TIA/EIA-569-AANSI/TIA/EIA-569-Bshall be followed.

The maximum horizontal cabling distance is as specified inclause 4.

The installation shall be limited to 300 m (984 ft) consisting of the combined length of the horizontal,intrabuilding backbone, and patch cords.

Centralized cabling implementations shall be located within the same building as the work areasserved. The administration of moves and changes shall be performed at the centralizedcross-connect. The addition and removal of horizontal links should be performed at thetelecommunications room or telecommunications enclosure. Pull-through cables are continuoussheath cables that are pulled through a telecommunications room or telecommunications

enclosure from the centralized cross-connect to the telecommunications outlet/connector. Thepull-through cable length shall be less than or equal to 90 m (295 ft). Pull-through cables shall meetthe same requirements of recognized horizontal optical fiber cable per clause 4 of

ANSI/TIA/EIA-568-B.3.

Centralized cabling design shall allow for migration (in part or in total) of the pull-through,interconnect, or splice implementation to a cross-connection implementation. Sufficient space shallbe left in the telecommunications room or telecommunications enclosureto allow for the additionof patch panels needed for the migration of the pull-through, interconnect, or splice to across-connection. Sufficient cable slack shall exist in the telecommunications room ortelecommunications enclosure to allow movement of the cables when migrating to across-connection.

NOTE Specifications on pull-through implementations apply equally to all mediatypes. Cross-connects for different media types are required by subclause 5.4 to bein the same location.

Slack may be stored as cable or unjacketed fiber (buffered or coated). Slack storage shall providebend radius control so that cable and fiber bend radius limitations are not violated. Cable slack maybe stored within enclosures or on the walls of the telecommunications room or telecommunicationsenclosure. Fiber slack shall be stored in protective enclosures.

http://tia-569-b.pdf/http://tia-569-b.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/http://tia-568-c.3.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-569-b.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/http://tia-eia-568-b.1.pdf/http://tia-568-c.3.pdf/

7/23/2019 273332598-TIA-568-B-1-5

25/28

TIA-568-B.1-5

19

Centralized cabling design shall allow for the addition and removal of horizontal and intrabuildingbackbone fibers. The layout of both rack-mount and wall-mount termination hardware shouldaccommodate modular growth in an orderly manner.

The intrabuilding backbone subsystem should be designed with sufficient spare capacity to serviceadditional outlet/connectors from the centralized cross-connect without the need to pull additionalintrabuilding backbone cables. The intrabuilding backbone fiber count should be sized to deliver

present and future applications to the maximum work area density within the area served by thetelecommunications room or telecommunications enclosure. Generally, two fibers are required foreach application delivered to a work area.

Centralized cabling shall support the labeling requirements of ANSI/TIA/EIA-606-A. In addition,splice and interconnect hardware in the telecommunications room or telecommunicationsenclosureshall be labeled with unique identifiers on each termination position. Field color-coding isnot used at the interconnect or splice. The centralized cross-connect termination positions connectedto telecommunications outlet/connector shall be labeled as a blue field. The blue field shall move tothe telecommunications room or telecommunications enclosurefor each circuit that is converted toa cross-connection in the telecommunications room or telecommunications enclosure.

Centralized cabling shall be implemented to ensure the correct fiber polarity as specified in subclause

10.3.2 (i.e., A-B orientation at the telecommunications outlet/connector and B-A orientation at thecentralized cross-connect).

http://tia-eia-606-a-final.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-568-b.1.pdf/http://tia-eia-606-a-final.pdf/

7/23/2019 273332598-TIA-568-B-1-5

26/28

7/23/2019 273332598-TIA-568-B-1-5

27/28

7/23/2019 273332598-TIA-568-B-1-5

28/28