TIA EIA 568B.3-2000光纤布线连接硬件标准

568

TIA/EIASTANDARD

Optical Fiber Cabling ComponentsStandard

TIA/EIA-568-B.3

(Revision of TIA/EIA-568-A) APRIL 2000

TELECOMMUNICATIONS INDUSTRY ASSOCIATION

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NOTICE

TIA/EIA Engineering Standards and Publications are designed to serve the public interest through

eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability andimprovement of products, and assisting the purchaser in selecting and obtaining with minimum delay theproper product for his particular need. Existence of such Standards and Publications shall not in anyrespect preclude any member or nonmember of TIA/EIA from manufacturing or selling products not

conforming to such Standards and Publications, nor shall the existence of such Standards and Publicationspreclude their voluntary use by those other than TIA/EIA members, whether the standard is to be usedeither domestically or internationally.

Standards and Publications are adopted by TIA/EIA in accordance with the American National StandardsInstitute (ANSI) patent policy. By such action, TIA/EIA does not assume any liability to any patent owner,nor does it assume any obligation whatever to parties adopting the Standard or Publication.

Note:The user’s attention is called to the possibility that compliance with this standard mayrequire use of an invention covered by patent rights.

By publication of this standard, no position is taken with respect to the validity of this claim or ofany patent rights in connection therewith. The patent holder has, however, filed a statement ofwillingness to grant a license under these rights on reasonable and nondiscriminatory terms andconditions to applicants desiring to obtain such a license. Details may be obtained from thepublisher.

This Standard does not purport to address all safety problems associated with its use or all applicableregulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safetyand health practices and to determine the applicability of regulatory limitations before its use.

(From Standards Proposal Nos. 3894 and 3894-A, formulated under the cognizance of the TIA TR-42Committee on User Premises Telecommunications Infrastructure.)

Published by

TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2000

Standards and Technology Department

2500 Wilson BoulevardArlington, VA 22201

PRICE: Please refer to current Catalog of

EIA ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING

PUBLICATIONS or call Global Engineering Documents, USA and Canada

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

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All rights reserved Printed in U.S.A.

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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

copies through entering into a license agreement. For information, contact:

Global Engineering Documents 15 Inverness Way East Englewood, CO 80112-5704 or call U.S.A. and Canada 1-800-854-7179, International (303) 397-7956

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OPTICAL FIBER CABLING COMPONENTS STANDARD

Table of Contents

1.

INTRODUCTION..........................................................................................................................11.11.21.31.42.

Purpose................................................................................................................................1Specification of criteria...........................................................................................................1Metric equivalents of US customary units.................................................................................1Life of the Standard................................................................................................................1

SCOPE.......................................................................................................................................22.12.2

Applicability...........................................................................................................................2Normative references..............................................................................................................2

3.DEFINITIONS, ABBREVIATIONS AND ACRONYMS, UNITS OF MEASURE....................................33.1General.................................................................................................................................33.1.1Definitions......................................................................................................................33.1.2Abbreviations and acronyms.............................................................................................63.1.3Units of measure.............................................................................................................6

4.OPTICAL FIBER CABLES............................................................................................................74.1General.................................................................................................................................74.2Cable transmission performance..............................................................................................74.3Physical cable specifications..................................................................................................74.3.1Inside plant cable specifications.......................................................................................74.3.2Outside plant cable specifications.....................................................................................84.3.2.1Drop cable...................................................................................................................8

5.CONNECTING HARDWARE..........................................................................................................95.1General.................................................................................................................................95.2Connector and adapter...........................................................................................................95.2.1Physical design..............................................................................................................95.2.2Performance...................................................................................................................95.2.3Multimode and singlemode identification............................................................................95.2.4Keying and labeling.........................................................................................................95.2.4.1568SC Connector.........................................................................................................95.2.4.2Other duplex connectors.............................................................................................105.3Telecommunications outlet box.............................................................................................105.4Patch panels.......................................................................................................................105.4.1Mounting......................................................................................................................105.4.2Mechanical termination density......................................................................................105.4.3Design.........................................................................................................................115.5Connecting hardware for centralized cabling...........................................................................115.6Optical fiber splice...............................................................................................................12

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6.PATCH CORDS.........................................................................................................................136.16.26.36.4

General...............................................................................................................................13Patch cord cable..................................................................................................................13Patch cord connectors.........................................................................................................13Termination configuration......................................................................................................13

7.FIELD TEST INSTRUMENTS......................................................................................................14

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7.17.2Multimode...........................................................................................................................14Singlemode.........................................................................................................................14

ANNEX A (NORMATIVE) OPTICAL FIBER CONNECTOR PERFORMANCE SPECIFICATIONS..............15A.1Introduction.........................................................................................................................15A.2Intermateability requirements................................................................................................15A.3Performance requirements....................................................................................................15A.3.1Visual and mechanical inspections: FOTP-13..................................................................15A.3.2Attenuation: FOTP-171 Methods A1 or D1, or FOTP-34 Method A2 for multimode...............15FOTP-171 Methods A3 or D3, or FOTP-34 Method B for singlemode...............................................15A.3.3Return loss: FOTP-107 or FOTP-8..................................................................................15A.3.4Low temperature: FOTP-188...........................................................................................16A.3.5Temperature life: FOTP-4...............................................................................................16A.3.6Humidity: FOTP-5.........................................................................................................16A.3.7Impact: FOTP-2............................................................................................................17A.3.8Strength of coupling mechanism: FOTP-185....................................................................17A.3.9Durability: FOTP-21.......................................................................................................17A.3.10Cable retention: FOTP-6................................................................................................18A.3.11Flex: FOTP-1................................................................................................................19A.3.12Twist: FOTP-36.............................................................................................................19ANNEX B (INFORMATIVE) BIBLIOGRAPHY AND REFERENCES........................................................20

List of Tables

Table 1 – Optical fiber cable transmission performance parameters..........................................................7

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List of Figures

Figure 1 – Position A and B configuration of a 568SC...........................................................................10Figure 2 – Optical fiber patch cord......................................................................................................13

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FOREWORD

(This foreword is not a part of this Standard.)

This Standard was developed by TIA/EIA Subcommittee TR-42.8.

Approval of Standard

This Standard was approved by TIA/EIA Subcommittee TR-42.8, TIA/EIA Engineering Committee TR-42, andthe American National Standards Institute (ANSI).

ANSI/TIA/EIA reviews standards every 5 years. At that time, standards are reaffirmed, rescinded, or revisedaccording to the submitted updates. Updates to be included in the next revision should be sent to thecommittee chair or to ANSI/TIA/EIA.

Contributing Organizations

More than 30 organizations within the telecommunications industry contributed their expertise to thedevelopment of this Standard (including manufacturers, consultants, end users, and other organizations).Documents Superseded

This Standard replaces, in part, ANSI/EIA/TIA-568-A, published October, 1995 and TIA TSB-72, publishedOctober, 1995.

Significant technical changes from the previous edition

— This foreword has been changed per the requirements of the TIA style manual.

— All definitions have been harmonized across all of TIA’s telecommunications infrastructure

standards.— Provides performance specifications for 50/125 µm optical fiber cables.

— Provides a minimum bend radius and maximum pulling tensions for horizontal cable, inside plant

cable, and outside plant optical fiber cable.— Allows for the use of alternate connector designs in addition to the 568SC.— Provides complete generic performance specifications for optical fiber connectors.— Specifies requirements for connecting hardware in support of centralized cabling.

Relationship to other TIA standards and documents

-Commercial Building Telecommunications Cabling Standard, Part 1, General Requirements(ANSI/TIA/EIA-568-B.1);---Commercial Building Standard for Telecommunications Pathways and Spaces (ANSI/TIA/EIA-569-A);Residential Telecommunications Cabling Standard (ANSI/TIA/EIA-570-A);

Administration Standard for the Telecommunications Infrastructure of Commercial Buildings(ANSI/TIA/EIA-606);

Commercial Building Grounding and Bonding Requirements for Telecommunications(ANSI/TIA/EIA-607).

Customer-Owned Outside Plant Telecommunications Cabling Standard (ANSI/TIA/EIA-758).

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The following documents may be useful to the reader:a)National Electrical Safety Code® (NESC®)

(IEEE C 2)b) National Electrical Code® (NEC®)

(NFPA 70)

Useful supplements to this Standard are the Building Industry Consulting Service International (BICSI)Telecommunications Distribution Methods Manual, the Customer-owned Outside Plant Methods Manual, andthe Cabling Installation Manual. These manuals provide practices and methods by which many of therequirements of this standard are implemented.Other references are listed in annex B.

Annexes

Annex A is normative and is considered a requirement of this Standard. Annex B is informative and notconsidered a requirement of this Standard.

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1.

1.1

INTRODUCTION

Purpose

This Standard specifies the component and transmission requirements for an optical fiber cabling system(e.g., cable, connectors). 50/125 µm and 62.5/125 µm multimode, and singlemode optical fiber cables arerecognized cables.

1.2Specification of criteria

In accordance with EIA Engineering Publication, EP-7B, two categories of criteria are specified; mandatoryand advisory. The mandatory requirements are designated by the word "shall"; advisory requirements aredesignated by the words "should”, "may", or "desirable" which are used interchangeably in this Standard.Mandatory criteria generally apply to protection, performance, administration and compatibility; they specifythe absolute minimum acceptable requirements. Advisory or desirable criteria are presented when theirattainment will enhance the general performance of the cabling system in all its contemplated applications.A note in the text, table, or figure is used for emphasis or offering informative suggestions.

1.3Metric equivalents of US customary units

The majority of the metric dimensions in this Standard are soft conversions of US customary units; e.g., 100millimeters (mm) is the soft conversion of 4 inches (in).

1.4Life of the Standard

This Standard is a living document. The criteria contained in this Standard are subject to revisions andupdating as warranted by advances in building construction techniques and telecommunications technology.

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2.

2.1

SCOPE

Applicability

This Standard specifies minimum requirements for optical fiber components used in premises cabling, suchas cable, connectors, connecting hardware, patch cords and field test equipment.

2.2Normative references

The following standards contain provisions that, through reference in this text, constitute provisions of thisStandard. At the time of publication, the editions indicated were valid. All standards are subject to revision;parties to agreements based on this Standard are encouraged to investigate the possibility of applying themost recent editions of the standards indicated. ANSI and TIA maintain registers of currently valid nationalstandards published by them.

OTE: -- The Commercial Building Telecommunications Cabling Standard: Part 1, GeneralN

Requirements was under development at the time of this Standard being approved and isexpected to be published as ANSI/TIA/EIA-568-B-1.

ANSI/TIA/EIA-598-A-1995, Optical Fiber Cable Color Coding

ANSI/TIA/EIA-604-3-1997, FOCIS 3 Fiber Optic Connector Intermateability Standard

ANSI/TIA/EIA-606-1993, Administration Standard For The Telecommunications Infrastructure OfCommercial Buildings

ANSI/EIA/TIA-455-A-1991, Standard Test Procedures for Fiber Optic Fibers, Cables and Transducers,Sensors, Connecting and Terminating Devices, and other Fiber Optic ComponentsANSI/ICEA S-83-596-1994, Fiber Optic Premises Distribution Cable

ANSI/ICEA S-87-640-2000, Fiber Optic Outside Plant Communications Cable

ANSI/TIA/EIA-526-7-1998, Optical Power Loss Measurements of Installed Single-mode Fiber CablePlant-OFSTP-7

ANSI/TIA/EIA-526-14-A-1998, Optical Power Loss Measurements of Installed Multimode Fiber CablePlant OFSTP-14A

ANSI/TIA/EIA-568-B.1, Commercial Building Telecommunications Cabling Standard: Part 1, GeneralRequirements

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3.

3.1

DEFINITIONS, ABBREVIATIONS AND ACRONYMS, UNITS OFMEASURE

General

This clause contains definitions of terms, acronyms, and abbreviations that have a special meaning or thatare unique to the technical content of this Standard. The terms that are used in only one clause may bedefined within, and at the beginning of, that clause.

3.1.1Definitions

The generic definitions in this subclause have been formulated for use by the entire family oftelecommunications infrastructure standards. As such, the definitions do not contain mandatoryrequirements of the Standard. Specific requirements are to be found in the normative subclauses of theStandard.

adapter; optical fiber duplex: A mechanical device designed to align and join two duplex optical fiberconnectors (plugs) to form an optical duplex connection.

administration: The method for labeling, identification, documentation and usage needed to implementmoves, additions and changes of the telecommunications infrastructure.

backbone: A facility (e.g., pathway, cable or conductors) between telecommunications rooms, or floordistribution terminals, the entrance facilities, and the equipment rooms within or between buildings.cable: An assembly of one or more insulated conductors or optical fibers, within an enveloping sheath.cable run: A length of installed media, which may include other components along its path.

cable sheath: A covering over the optical fiber or conductor assembly that may include one or moremetallic members, strength members, or jackets.

cabling: A combination of all cables, jumpers, cords, and connecting hardware.campus: The buildings and grounds having legal contiguous interconnection.

centralized cabling: A cabling configuration from the work area to a centralized cross-connect using pullthrough cables, an interconnect, or splice in the telecommunications room.connecting hardware: A device providing mechanical cable terminations.

connector (plug), duplex; optical fiber: A remateable device that terminates two fibers and mates with aduplex receptacle.

consolidation point: A location for interconnection between horizontal cables extending from buildingpathways and horizontal cables extending into furniture pathways.

cross-connect: A facility enabling the termination of cable elements and their interconnection orcross-connection.

cross-connection: A connection scheme between cabling runs, subsystems, and equipment using patchcords or jumpers that attach to connecting hardware on each end.

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equipment cable; cord: A cable or cable assembly used to connect telecommunications equipment tohorizontal or backbone cabling.fiber optic: See optical fiber.

horizontal cabling: The cabling between and including the telecommunications outlet/connector and thehorizontal cross-connect.

horizontal cross-connect: A cross-connect of horizontal cabling to other cabling, e.g., horizontal,backbone, equipment.

hybrid optical fiber cable: An optical fiber cable containing two or more fiber types (e.g., multimode andsinglemode).

infrastructure (telecommunications): A collection of those telecommunications components, excludingequipment, that together provide the basic support for the distribution of all information within a building orcampus.

interconnection: A connection scheme that employs connecting hardware for the direct connection of acable to another cable without a patch cord or jumper.

intermediate cross-connect: A cross-connect between first level and second level backbone cabling.keying: The mechanical feature of a connector system that guarantees correct orientation of a connection,or prevents the connection to a jack, or to an optical fiber adapter of the same type intended for anotherpurpose.

link: A transmission path between two points, not including terminal equipment, work area cables, andequipment cables.

listed: Equipment included in a list published by an organization, acceptable to the authority havingjurisdiction, that maintains periodic inspection of production of listed equipment, and whose listing stateseither that the equipment or material meets appropriate standards or has been tested and found suitable foruse in a specified manner.

main cross-connect: A cross-connect for first level backbone cables, entrance cables, and equipmentcables.

media (telecommunications): Wire, cable, or conductors used for telecommunications.mode: A path of light in an optical fiber.

multimode optical fiber: An optical fiber that carries many paths of light.

open office: A floor space division provided by furniture, moveable partitions, or other means instead of bybuilding walls.

optical fiber: Any filament made of dielectric materials that guides light.optical fiber cable: An assembly consisting of one or more optical fibers.

outlet box (telecommunications): A metallic or nonmetallic box mounted within a wall, floor, or ceilingand used to hold telecommunications outlets/connectors or transition devices.

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outlet cable: A cable placed in a residential unit extending directly between the telecommunicationsoutlet/connector and the distribution device.

outlet/connector (telecommunications): A connecting device in the work area on which horizontal cableor outlet cable terminates.

outside plant: Telecommunications infrastructure designed for installation exterior to buildings.patch cord: A length of cable with a plug on one or both ends.

patch panel: A connecting hardware system that facilitates cable termination and cabling administrationusing patch cords.

pathway: A facility for the placement of telecommunications cable.pull strength: See pull tension.

pull tension: The pulling force that can be applied to a cable.sheath: See cable sheath.

shield: A metallic layer placed around a conductor or group of conductors.singlemode optical fiber: An optical fiber that carries only one path of light.splice: A joining of conductors in a splice closure, meant to be permanent.

telecommunications: Any transmission, emission, and reception of signs, signals, writings, images, andsounds, that is, information of any nature by cable, radio, optical, or other electromagnetic systems.work area (work station): A building space where the occupants interact with telecommunicationsterminal equipment.

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3.1.2

ANSIBICSIEIAFOCISFOTPICEALEDN/ANEC®NESC®TIATSB

Abbreviations and acronyms

American National Standards Institute

Building Industry Consulting Service InternationalElectronic Industries Alliance

Fiber Optic Connector Intermateability StandardFiber Optic Test Procedure

Insulated Cable Engineers Associationlight emitting diodenot applicable

National Electrical Code®

National Electrical Safety Code®

Telecommunications Industry AssociationTelecommunications System Bulletin

3.1.3

dBºCºFginkgkmlblbfMHzmmNnmµm

Units of measure

decibel

degrees Celsiusdegrees Fahrenheitgraminchkilogramkilometerpound

pound-forcemegahertzmillimeterNewtonnanometer

micrometer or micron

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4.

4.1

OPTICAL FIBER CABLES

General

This clause contains the performance specifications for the optical fiber cables recognized in premisescabling standards.

4.2Cable transmission performance

The outside plant telecommunications cable shall comply with ANSI/ICEA S-87-640. Inside plant opticalfiber telecommunications cable shall comply with ANSI/ICEA S-83-596.Each cabled fiber shall meet the graded performance specifications of table 1.

Table 1 – Optical fiber cable transmission performance parameters

Minimum informationtransmission capacityfor overfilled launch

(MHz km)

500500160500N/AN/AN/AN/A

Optical fibercable type50/125 µmmultimode

Wavelength

(nm)

8501300850

Maximum attenuation

(dB/km)

3.51.53.51.51.01.00.50.5

62.5/125 µmmultimode

singlemodeinside plant cable

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13001310155013101550

singlemodeoutside plant cable

NOTE - The information transmission capacity of the fiber, as measured by the fibermanufacturer, can be used by the cable manufacturer to demonstrate compliance with thisrequirement.

4.3Physical cable specifications

The optical fiber cable construction shall consist of 50/125 µm or 62.5/125 µm multimode optical fibers orsinglemode optical fibers, or a combination of these media. Individual fibers and groups of fibers shall beidentifiable in accordance with ANSI/TIA/EIA-598-A. The cable shall be listed and marked as required underthe applicable electrical code and local building code requirements.

4.3.1Inside plant cable specifications

The mechanical and environmental specifications for inside plant optical fiber cable shall be in accordancewith ANSI/ICEA S-83-596.

2- and 4-fiber cables intended for horizontal or centralized cabling shall support a bend radius of 25 mm

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(1 in) under no-load conditions. 2- and 4-fiber cables intended to be pulled through horizontal pathwaysduring installation shall support a bend radius of 50 mm (2 in) under a pull load of 222 N (50 lbf). All otherinside plant cables shall support a bend radius of 10 times the cable outside diameter when not subject totensile load, and 15 times the cable outside diameter when subject to tensile loading up to the cable’s ratedlimit.

4.3.2Outside plant cable specifications

The mechanical and environmental specifications for outside plant optical fiber cable shall be in accordancewith ANSI/ICEA S-87-640.

Outside plant optical fiber cables shall be of a water-block construction and meet the requirements forcompound flow and water penetration as established by ANSI/ICEA S-87-640. Outdoor cable shall have aminimum pull strength of 2670 N (600 lbf).

Outside plant cables shall support a bend radius of 10 times the cable outside diameter when not subject totensile load, and 20 times the cable outside diameter when subject to tensile loading up to the cable’s ratedlimit.

4.3.2.1Drop cable

Drop cables are typically small diameter, low fiber count cables with limited unsupported span distances.They are used to feed a small number of fibers from a higher fiber count cable into a single location. Dropcable shall have a minimum pull strength of 1335 N (300 lbf).

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5.

5.1

CONNECTING HARDWARE

General

This clause contains the performance specifications for the optical fiber connectors, connecting hardwareand splices recognized in premises cabling standards. These requirements apply to connecting hardware atthe main cross-connect, intermediate cross-connect, horizontal cross-connect, centralized cablinginterconnection and splice, consolidation point and work area.

Various connector designs may be used provided that the connector design satisfies the performancerequirements specified within annex A. These connector designs shall meet the requirements of thecorresponding TIA Fiber Optic Connector Intermateability Standard (FOCIS) document. The duplex SCconnector and adapter (referred to as the 568SC) are used for references and illustrative purposes in thisStandard.

NOTE - The term adapter, when used in reference with optical fiber, should not be confusedwith its definition when used in reference with other media types, such as twisted-paircabling. The term adapter has been adopted by the optical fiber industry and standardsorganizations to define a mechanical termination device designed to align and join two likeoptical connectors.

5.2

5.2.1

Connector and adapter

Physical design

Connector designs shall meet the requirements of the corresponding TIA FOCIS document. For example,the 568SC connector and adapter shall meet the requirements of ANSI/TIA/EIA-604-3; designation FOCIS3P-0-2-1-1-0 for singlemode plugs, designation FOCIS 3P-0-2-1-4-0 for multimode plugs, and designationFOCIS 3A-2-1-0 for adapters. No means to prevent mating singlemode to multimode fibers is required.

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5.2.2Performance

The performance of the connector designs shall meet the requirements specified in annex A.

5.2.3Multimode and singlemode identification

The multimode connector or a visible portion of it shall be beige in color. The multimode adapter or outletshall be identified by the color beige. The singlemode connector or a visible portion of it shall be blue incolor. The singlemode adapter or outlet shall be identified by the color blue.

5.2.45.2.4.1

Keying and labeling

568SC Connector

The two fiber positions in a 568SC connector and the corresponding 568SC adapter shall be referred to asPosition A and Position B. Figure 1 shows the locations of Position A and Position B in the 568SCconnector and adapter with respect to the keys and keyways. As the figure indicates, the 568SC adaptershall perform a pair-wise crossover between connectors. Additionally, the plane (frontal) view inset in figure 1shows Position A and Position B in the two possible horizontal and two possible vertical orientations. Theshading used in figure 1 is for clarification only and is not a specified identification scheme. The twopositions of the 568SC adapter shall be identified as Position A and Position B by using the letterdesignators A and B respectively. Labeling may be either field or factory installed.

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Figure 1 – Position A and B configuration of a 568SC

5.2.4.2Other duplex connectors

Alternate connector designs shall employ similar labeling and identification schemes. Position A andPosition B on alternate duplex connector designs shall be in the same position as the 568SC in figure 1. Foralternate connector designs utilizing latches, the latch defines the positioning in the same manner as thekey and keyways.

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5.3Telecommunications outlet box

As a minimum, the telecommunications outlet box shall be capable of housing two terminated optical fibers.The outlet box shall have the ability to secure the optical fiber cable and provide for a minimum fiber bendradius of 25 mm (1 in).

5.4

5.4.1

Patch panels

Mounting

Optical fiber cable connecting hardware should be designed to provide flexibility for mounting on walls, inracks, or on other types of distribution frames and standard mounting hardware.

5.4.2Mechanical termination density

Optical fiber cable connecting hardware should incorporate high-density termination to conserve space andprovide for ease of optical fiber cable and patch cord management upon installation.

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5.4.3Design

The optical fiber patch panel shall be designed to provide a:

a)means to cross-connect cabling with patch cords;

b)means to interconnect premises equipment to the optical fiber cabling;

c)means to identify cabling for administration in accordance with ANSI/TIA/EIA-606;

d)means to use standard colors to functionally identify termination groups per ANSI/TIA/EIA-606;e)means of handling optical fiber cables and patch cords, and to promote orderly management;f)

means of access to monitor or test optical fiber cabling and premises equipment; and,

g)means of adequate protection for connectors and adapters on the cabling side from accidental

contact with foreign objects that may temporarily or permanently degrade the optical performance.

5.5Connecting hardware for centralized cabling

The optical fiber connecting hardware used to join horizontal cables to intrabuilding backbone cables in acentralized cabling configuration shall be designed to:

a)provide a means of joining the fibers between the backbone and horizontal cables by using either

re-mateable connectors or splices. It is recommended that only one method be used at a facility;

1)Re-mateable connectors shall meet the requirements of subclause 5.2.

2)Splices may be either fusion or mechanical. Splices shall meet the requirements of subclause

5.6.b)provide joining technology which allows fibers to be joined as single fibers or as fiber pairs, but

organizes and manages the fiber by pairs;c)provide a means to uniquely identify each joining position;

d)allow for removal of existing horizontal connections, and the addition of new horizontal connections;e)provide a means to store and identify non-connected fibers from either the backbone or the

horizontal cables;f)

provide a means to accommodate the addition of backbone cables, or horizontal cables, or both;

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g)provide a means for migration from an interconnection or splice to a cross-connection;h)provide a means of access to test optical fiber cabling; and,i)

provide adequate protection for the connections against accidental contact with foreign objects thatmay disturb optical continuity.

The manufacturer shall provide installation and design instructions and recommendations to accomplish theabove requirements.

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5.6Optical fiber splice

Optical fiber splices, fusion or mechanical, shall not exceed a maximum optical attenuation of 0.3 dB whenmeasured in accordance with ANSI/EIA/TIA-455-34, Method A (factory testing) or ANSI/EIA/TIA-455-59 (fieldtesting).

Optical fiber splices, fusion or mechanical, shall have a minimum return loss of 20 dB for multimode, 26 dBfor singlemode, when measured in accordance with ANSI/EIA/TIA-455-107. The minimum singlemode returnloss for broadband analog video (CATV) applications is 55 dB.

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6.

6.1

PATCH CORDS

General

This clause contains the performance specifications for the optical fiber patch cords recognized in premisescabling standards. These patch cords are used to connect optical fiber links at cross-connects and asequipment or work area cords used to connect telecommunications equipment to horizontal or backbonecabling.

NOTE - The requirements for special application cable assemblies are outside the scope ofthis Standard.

6.2Patch cord cable

The optical fiber patch cord shall be a two-fiber cable, of the same fiber type as the optical fiber cabling, ofan indoor construction, and shall meet the requirements of subclauses 4.2 and 4.3.1.

6.36.4

Patch cord connectorsTermination configuration

The patch cord connector shall meet the requirements of subclause 5.2.

Optical fiber patch cords, whether they are used for cross-connection or interconnection to equipment, shallbe of an orientation such that Position A goes to Position B on one fiber, and Position B goes to Position Aon the other fiber of the fiber pair (figure 2). Each end of the optical fiber patch cord shall be identified toindicate Position A and Position B if the connector can be separated into its simplex components. Foralternate connector designs utilizing latches, the latch defines the positioning in the same manner as thekeys.

For simplex connectors, the connector that plugs into the receiver shall be considered Position A, and theconnector that plugs into the transmitter shall be considered Position B.

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= Connector

Figure 2 – Optical fiber patch cord

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