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
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26、ense with EIANot for ResaleNo 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 Definition of terms, acron
27、yms 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 5.3 Visible light
28、 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 Measuring link atte
29、nuation9 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 for multimod
30、e 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 (multimode)7 Figure 2
31、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 Provided by IHS un
32、der license with EIANot for ResaleNo 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 Example link attenuation measurement of singlemode cabling using an OLTS 10 Figure 7 OTDR s
33、etup 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 Example OTDR trace illustrating insertion loss measurement . 17 List of Tables Table 1 Acceptable
34、 mandrel diameters for common multimode cable types (five wraps) . 14 ii Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/TSB-140 Foreword (This foreword is not part of the T
35、elecommunications Systems Bulletin) Designers, end-users and installers that are involved in telecommunications cabling systems are continually using optical fiber cabling systems to support a variety of networking technologies. These designers, end-users and installers have expressed a need to clar
36、ify testing of optical fiber cabling. This expressed concern was brought to the Telecommunications Industry Association (TIA) TR-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. T
37、R-42 asked that the TIA Fiber Optics Engineering Committee, FO-4, be involved in the development of this Telecommunications Systems Bulletin. The FO-4 Engineering Committee graciously accepted endeavoring to help designers, end-users and installers understand proper testing of optical fiber cabling.
38、 TIA Telecommunications Systems Bulletins are developed within the Technical Engineering Committees of the TIA and the standards coordinating committees of the TIA standards board. Members of the committees serve voluntarily and without commission. The companies that they represent are not necessari
39、ly members of the TIA. The bulletins developed within the TIA represent a consensus of a broad expertise on the subject. This expertise 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 Syste
40、ms Bulletin was developed is from the contributors experience and the state of the art at that time. This Telecommunications Systems Bulletin has been prepared by the TR-42.8 Subcommittee and approved by the TR-42 Technical Engineering Committee. iii Copyright Telecommunications Industry Association
41、 Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA/TSB
42、-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 interconnected) with a connector or
43、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 installed connectors or even the pres
44、ence 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 information that demonstrates t
45、he 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 constitutes Tier 1 testing. Tier 2 tes
46、ting, 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 f
47、or descriptions of test measurement methods. 2 SCOPE Testing conducted on optical fiber cabling should be in accordance with a published standard. This Telecommunications Systems Bulletin (TSB) describes field-testing of length, optical attenuation and polarity in optical fiber cabling using an opti
48、cal loss test set (OLTS), optical time domain reflectometer (OTDR) and a visible light source such as a visual fault locator (VFL). The purpose of this document is to clarify, not replace, ANSI/TIA/EIA-526-7 and ANSI/TIA/EIA-526-14A. Tier 1 criteria, unless otherwise instructed or requested, constit
49、utes testing in accordance with this TSB. 2.1 Safety All tests performed on optical fiber cabling that use a laser or light emitting diode (LED) in a test set are to be carried out with safety precautions in accordance with ANSI Z136.2. 2.2 References The following documents contain provisions, which through reference in this text, constitute provisions of this TSB. At the time of public
