1、TIA/EIA TELECOMMUNICATIONS SYSTEMS BULLETIN Guidelines for Maintaining Optical Fiber Polarity Through Reverse-Pair P osit ion in g TSB125 June 2001 TELECOMMUNICATIONS INDUSTRY ASSOCIATION The Telecoininiiiiicatioiis Industry Associatiou represents tlie communications sector of Eiectron ic Industries
2、 Alliance NOTICE TIA/EIA 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 and obtaining wi
3、th minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect 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 Sta
4、ndards and Publications preclude their voluntary use by those other than TIMEIA members, whether the standard is to be used either domestically or internationally. Standards, Publications and Bulletins are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent poli
5、cy. 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, Publication, or Bulletin. Technical Bulletins are distinguished from TIMEIA Standards or Interim Standards, in that they contain a compilation o
6、f 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 approaches that similarly represent good engineering practice, or
7、 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 encouraged to do so. It is the intention of the formulating commi
8、ttee to revise and update this Bulletin from time to time as may be occasioned by changes in technology, industry practice, or government regulations, or for other appropriate reasons. (From Project No. 4890, formulated under the cognizance of the TIA TR-42.8 Subcommittee on Telecommunications Optic
9、al Fiber Cabling Systems.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION 200 1 Standards and Technology Department 2500 Wilson Boulevard Arlington, VA 22201 PRICE: Please refer to the current Catalog of ELECTRONIC INDUSTRIES ALLIANCE STANDARDS and ENGINEERING PUBLICATIONS or call Global Engin
10、eering Documents, USA and Canada (1-800-854-7179) International (303-397-7956) All rights reserved Printed in U. S.A. TIAIEIA TSB125 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Guidelines for Maintaining Optical Fiber Polarity Through Reverse-Pair Positi
11、oning January 25,2001 Prepared by: TIAIEIA Optical Fiber Cabling Subcommittee TIA TR-42.8 NOTICE: This TSB is intended to provide additional information for maintaining optical fiber polarity through reverse pair positioning. Intellectual Property Statement The individuals preparing this contributio
12、n do not know of patents, the use of which may be essential to a standard resulting in whole or part from this contribution. Copyright Statement The Contributors grants a free, irrevocable license to the Telecommunications Industry Association (TIA) to incorporate text contained in this contribution
13、 and any modifications thereof in the creation of a TIA standards publication; to copyright in TIAS name any standards publication even though it may include portions of this contribution; and at TIA?S sole discretion to permit others to reproduce in whole or in part the resulting TIA standards publ
14、ication. NOTE - This TSB is copyright protected and shall not be reproduced in whole or in part without the permission of the Telecommunications Industry Association. TIAIEIA TSB125 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Guidelines for Maintaining Optical Fiber
15、 Polarity Through Reverse-Pair Positioning Table of Contents II FOREWORD . 1 . 1 2 Purpose and Scope 1 3 1 4 Guidelines 1 4.1 General . 1 4.2 Implementing reverse-pair positi . 2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16、. . . . . Normative References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . List of Figures Figure 1 - Reverse-pair positioning utilizing cross-connects 3 Figure 2 - Reverse-pair positioning utilizing cross-connects wit
17、h an interconnect 3 Figure 3 - Reversepair positioning with a duplex connector type utilizing cross connects and an interconnect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 List of Tables Table 1 - Fiber number and color identification . 2 I TINEIA TSB125 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 FOREWORD (This foreword is not part of the Telecommunications Systems Bulletin)
19、 After ANSIITINEIA-568-B.l was approved for publication, it was realized that there was a need to explain and illustrate the concept of maintaining optical fiber polarity through reversepair positioning. The TIA TR42 Engineering Committee on User Premises Telecommunications Cabling Infrastructure ac
20、cepted the task and assigned it to the TR-42.8 Subcommittee, Telecommunications Optical Fiber Cabling Systems. The TR-42.8 Subcommittee cooperated with the TR42.1 Subcommittee on Commercial Building Cabling which is related to this activity. TIA Telecommunications Systems Bulletins are developed wit
21、hin 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 necessarily members of the TIA. The bulletins developed within the T
22、IA represent a consensus of the 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 Systems Bulletin was approved was from the contributors experi
23、ence and the state of the art at that time. Users are encouraged to verify that they have the latest revision of the telecommunications systems bulletin. This Telecommunications Systems Bulletin has been prepared by the TR-42.8 Subcommittee and approved by TR-42, the Technical Engineering Committee
24、on User Premises Telecommunications Infrastructure. II TIAIEIA TSB125 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 1. INTRODUCTION Maintaining optical fiber cabling polarity through the cabling system is crucial to the delivery of services. Once a c
25、abling system is installed and correct polarity of the fiber pairs is verified, the administration of transmit and receive fibers will not be of concern to the encCuser. Reverse fiber pair positioning assures polarity by using identical adapter orientation on both ends of the cable and reversing the
26、 order of the fibers within each pair. 2 PURPOSE AND SCOPE This Telecommunications Systems Bulletin (TSB) is intended to provide installation guidelines for maintaining polarity of transmit and receive fibers in optical fiber cabling systems. These guidelines are intended for cabling installations r
27、egardless of the connector type (simplex or duplex types), the number of cross-connects, or the inclusion of an interconnect. This TSB expands upon the description of reversepair positioning within ANSIITIAIEIA-568-B.l, sub-clause 10.3.2. 3 NORMATIVE REFERENCES The following standards contain provis
28、ions, which through reference in this text, constitute provisions of this TSB. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this TSB are encouraged to investigate the possibility of applying the most recent e
29、ditions of the standards indicated below. ANSI and TIA maintain registers of currently valid national standards published by them. 0 ANSI/TIAIEIA-568B.I, Commercial Building Telecommunications Cabling Standard: Part 1, 0 0 General Requirements ANSI/TIAIEIA-568B.3, Optical Fiber Cabling Components St
30、andard ANSI/TIAIEIA-598A, Optical Fiber Cable Color Coding 4 GUIDELINES 4.1 General Optical fiber cable should be color-coded as described in ANSIITIAIEIA-598-A. This color-code is used for ease of identification and numbering of the individual fibers as reflected in table 1. Optical fiber cabling s
31、hould be installed so that the odd numbered fiber within the cable is paired with the next consecutive even numbered fiber (e.g., fiber l-blue paired with fiber 2-orange, fiber 3-green paired with fiber 4-brown). This installation of paired fibers forms the transmit and the receive transmission path
32、s used in providing a two-fiber telecommunications circuit. To achieve these transmission paths while retaining cable integrity, reversepair positioning may be used. Reversepair positioning is achieved by installing fibers in consecutive numbering sequence (i.e., 1,2,3,4 ) on one end of an optical f
33、iber link, and installing fibers using reverse-pair numbering (i.e., 2,1,4,3 ) on the other end of the optical fiber link. Optical fiber patch cords, as specified in ANSI/TIAIEIA-568B.3 clause 6, should be used when completing circuits using reversepair positioning. 1 TINEIA TSB125 1 I Blue 1 7 I Re
34、d 2 2 3 4 5 6 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Orange 8 Black Green 9 Yellow Brown 10 Violet Slate 11 Rose White 12 Aaua Table 1 - Fiber number and color identification I Fiber I I Fiber I 4.2 Implementing reverse -pair positioning To implement reverse pair positioning in the cab
35、ling system, the following steps should be taken. a) Assign each fiber in a given cable a sequential number, following the same order as described in ANSI/TIA/ElA-598-A (see table 1). b) Install connectors in adapters on both ends of the cable as follows (see figures 1, 2, and 3): 1) On one end of t
36、he cable, install the connectors in the adapters in consecutive order (i.e., 1, 2, 3, 4, .) from left to right. 2) On the other end of the cable, install the connectors in the adapters in reversepair numbering (i.e., 2, 1, 4, 3, .) from left to right. NOTES 1 - From the installers point of view, fib
37、er l-blue will appear on the left on one end and on the right on the other end. Fiber 2-orange will appear in the opposite manner, right on one end of the link and left on the other end of the link. 2 - Reversepair positioning may be obtained by installing the fibers on the connectors in this manner
38、 or by installing connectors into the adapters in this orientation. c) Successive cables placed in the channel (e.g., MC to IC, IC to HC) should be installed as described above. 2 TINEIA TSB125 4 5 6 Key-Wp Figure 1 - Reverse-pair positioning utilizing cross-connects MC Id 3 TINEIA TSB125 1 2 5 q? HC WA Key-Up # Kay-Daislri: Figure 3 - Reverse-pair positioning with a duplex connector type utilizing cross connects an interconnect and 4
