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1、 TIA TELECOMMUNICATIONS SYSTEMS BULLETIN Additional Guidelines for Field- Testing Length, Loss and Polarity of Optical Fiber Cabling Systems TSB-140 FEBRUARY 2004 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecommunications Industry Association represents the communications sector of Copyright Tel
2、ecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- NOTICE TIA Engineering Standards and Publications are designed
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7、A Standards or Documents, in that they contain a compilation of engineering data or information useful to the technical community, and represent approaches to good engineering practices that are suggested by the formulating committee. This Bulletin is not intended to preclude or discourage other app
8、roaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the attention of the formulating committee to be considered for inclusion in future revisions of this Bulletin are enc
9、ouraged to do so. It is the intention of the formulating committee to review this document every five years, but it maybe revised and updated at any time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 3
10、-0063, formulated under the cognizance of the TIA TR-42.8 Subcommittee on Telecommunications Optical Fiber Cabling Systems) . Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 2004 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 U.S.A. PRICE: Please refer to current
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24、iation Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- PLEASE! DONT VIOLATE THE LAW! This document is copyrighted by the TIA and may not be reprodu
25、ced without prior permission of the Telecommunications Industry Association. For information consult our website at http:/www.tiaonline.org/about/faqDetail.cfm?id=18 Organizations may obtain permission to reproduce a limited number of copies through entering into a license agreement. For information
26、, 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 Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, B
27、ernie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA/TSB-140 Additional Guidelines for Field-Testing Length, Loss and Polarity of Optical Fiber Cabling Systems Contents 1 Introduction.1 2 Scope1 2.1 Safety1 2.2 References .1 3 Defini
28、tion of terms, acronyms and abbreviations, units of measure, symbols .2 3.1 General.2 3.2 Definition of terms.2 3.3 Acronyms and abbreviations 3 3.4 Units of measure.3 4 Test criteria.3 4.1 General.3 4.2 Tier 1.3 4.3 Tier 2 (Optional)4 5 Test instruments.4 5.1 General.4 5.2 Optical loss test set.4 5
29、.3 Visible light source4 5.4 Optical time domain reflectometer5 6 Precautions to measurement testing5 7 Test measurement methods.5 7.1 Optical link attenuation .5 7.1.1 General.5 7.1.2 Verifying test jumper quality .6 7.1.3 Multimode .7 7.1.3.1 General.7 7.1.3.2 Setting the reference 8 7.1.3.3 Measu
30、ring link attenuation9 7.1.3.4 Calculating link attenuation.9 7.1.4 Singlemode.9 7.1.4.1 General.9 7.1.4.2 Setting the reference 10 7.1.4.3 Measuring link attenuation10 7.1.4.4 Calculating link attenuation.11 7.2 Length.11 7.3 Polarity11 7.4 OTDR trace.11 8 Documentation12 ANNEX A Mandrel wrap usage
31、 for multimode fiber testing with an OLTS LED source13 ANNEX B Interpreting length, attenuation rate, and insertion loss from an OTDR trace15 B.1 Length.15 B.2 Attenuation rate 16 B.3 Insertion loss.17 List of Figures Figure 1 Example of OLTS reference measurement (P1) with one test jumper (multimod
32、e)7 Figure 2 Example of a measurement (P2) when verifying OLTS test jumpers (multimode)7 Figure 3 Example of OLTS reference measurement (P1) with one test jumper (multimode)8 Figure 4 Example of a multimode link attenuation measurement (P2)9 i Copyright Telecommunications Industry Association Provid
33、ed by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA/TSB-140 Figure 5 Example of OLTS reference measurement (P1) one test jumper (singlemode). 10 Figure 6
34、 Example link attenuation measurement of singlemode cabling using an OLTS 10 Figure 7 OTDR setup illustration of fiber link testing 12 Figure 8 Effect of mandrel wrap 13 Figure 9 Example OTDR trace illustrating length . 15 Figure 10 Example OTDR trace illustrating attenuation rate 16 Figure 11 Examp
35、le OTDR trace illustrating insertion loss measurement. 17 List of Tables Table 1 Acceptable mandrel diameters for common multimode cable types (five wraps) . 14 ii Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Be
36、rnie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without license from IHS -,-,- TIA/TSB-140 Foreword (This foreword is not part of the Telecommunications Systems Bulletin) Designers, end-users and installers that are involved in telecommunications cabling systems a
37、re continually using optical fiber cabling systems to support a variety of networking technologies. These designers, end-users and installers have expressed a need to clarify testing of optical fiber cabling. This expressed concern was brought to the Telecommunications Industry Association (TIA) TR-
38、42.8 Subcommittee on Optical Fiber Cabling Systems as a proposed project. In turn, Engineering Committee TR-42 agreed with this need and assigned the project to TR-42.8. TR-42 asked that the TIA Fiber Optics Engineering Committee, FO-4, be involved in the development of this Telecommunications Syste
39、ms Bulletin. The FO-4 Engineering Committee graciously accepted endeavoring to help designers, end-users and installers understand proper testing of optical fiber cabling. TIA Telecommunications Systems Bulletins are developed within the Technical Engineering Committees of the TIA and the standards
40、coordinating committees of the TIA standards board. Members of the committees serve voluntarily and without commission. The companies that they represent are not necessarily members of the TIA. The bulletins developed within the TIA represent a consensus of a broad expertise on the subject. This exp
41、ertise comes from within the TIA as well as those outside of the TIA that have an expressed interest. The viewpoint expressed at the time that this Telecommunication Systems Bulletin was developed is from the contributors experience and the state of the art at that time. This Telecommunications Syst
42、ems Bulletin has been prepared by the TR-42.8 Subcommittee and approved by the TR-42 Technical Engineering Committee. iii Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:54:06 M
43、DTNo reproduction or networking permitted without license from IHS -,-,- Copyright Telecommunications Industry Association Provided by IHS under license with EIALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/29/2007 21:54:06 MDTNo reproduction or networking permitted without
44、 license from IHS -,-,- TIA/TSB-140 1 INTRODUCTION Accurate characterization and testing of installed optical fiber cabling is crucial to ensuring overall network integrity and performance. An optical fiber cabling link may consist of a fiber or concatenated fibers (spliced, cross-connected or inter
45、connected) with a connector or adapter on each end. The fiber type, link length, the number and quality of terminations and splices, cable stresses, and wavelength can all affect attenuation measurements. For example, link attenuation can be negatively influenced by severe cable bends, poorly instal
46、led connectors or even the presence of dirt on the endface of connectors. The attenuation measurement result should always be less than the designed attenuation budget (also known as loss budget) that is based on the number of terminations and cable length. Documenting the test results provides the
47、information that demonstrates the acceptability of the cabling system or support of specific networking technologies. Testing installed optical fiber cabling for attenuation with an optical loss test set (OLTS), as described in cabling standards, and verifying the cabling length and polarity constit
48、utes Tier 1 testing. Tier 2 testing, which is optional, includes the Tier 1 tests plus the addition of an optical time domain reflectometer (OTDR) trace. An OTDR trace can be used to characterize the installed fiber link resulting in an indication of the uniformity of cable attenuation and connector insertion loss. See clause 7 for descriptions of test measurement methods. 2 SCOPE Testing conducted on optical fiber cabling should be in accordance with a published standard. This Telecommuni