08-30175854-DC.pdf
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1、a Date: 7 January 2008 Origin: International Latest date for receipt of comments: 30 April 2008 Project no.: 2006/01924 Responsible committee: GEL/86 Fibre optics Interested committees: Title: Draft IEC 61746-2 Ed 1 : Calibration of optical time-domain reflectometers (OTDR) - Part 2 : OTDR for multi
2、mode fibres Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS I
3、S A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 30 April 2008. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for
4、information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination
5、by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email ordersbsi-. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operat
6、ing organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on
7、the BSI web site http:/www.bsi-. Direct tel: 020 8996 7298 Responsible Committee Secretary: Mr Ciaran Molloy (BSI) E-mail: ciaran.molloybsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 08/301
8、75854 DC Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:51:33 GMT+00:00 2008, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on international discussions in which the UK has taken an active part. Your comments on this draft are welcom
9、e and will assist in the preparation of the consequent standard. If no comments are received to the contrary, then the UK will approve this draft. There is a high probability that this text could be adopted by CENELEC as a reference document for harmonization or as a European Standard. Recipients of
10、 this draft are requested to comment on the text bearing in mind this possibility. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments receive efficient
11、 and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compatible with Version
12、 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example below. Further informa
13、tion on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g.
14、3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector
15、to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Co
16、rporation. Licensed Copy: London South Bank University, London South Bank University, Fri Feb 15 06:51:33 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 86/291/CD COMMITTEE DRAFT (CD) IEC/TC or SC: TC 86 Project number IEC 61746-2 Ed. 1.0 Title of TC/SC: Fibre optics Date of circulation 2007-12-21 Closi
17、ng date for comments 2008-03-21 Also of interest to the following committees Supersedes document 86/262/CD and 86/269/CC Functions concerned: Safety EMC Environment Quality assurance Secretary: James E. Matthews III - USA THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT SHOULD NOT BE USE
18、D FOR REFERENCE PURPOSES. RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. Title: IEC 61746-2 Ed. 1.0: Calibration of optical time-domain reflectometers (OTDR) - Part 2:
19、 OTDR for multimode fibres (Titre) : Introductory note When published, IEC 61746-2 Ed. 1.0, along with IEC 61746-1 Ed. 1.0, will cancel and replace IEC 61746 Ed. 2.0. FORM CD (IEC) 2002-08-08 Copyright 2007 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to downl
20、oad this electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy or “mirror“ the file or printed version of the document, or any part of it, for any other purpose without permission in writing from IEC. Licensed Co
21、py: London South Bank University, London South Bank University, Fri Feb 15 06:51:33 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 86/291/CD 2 CONTENTS 1 FOREWORD . 4 2 INTRODUCTION 6 3 1 Scope . 7 4 2 Normative references 7 5 3 Terms, definitions and symbols 7 6 4 Preparation for calibration 13 7 4.1 O
22、rganization13 8 4.2 Traceability .13 9 4.3 Preparation .14 10 4.4 Test conditions14 11 4.5 Documentation 14 12 5 Distance calibration General14 13 5.1 Introduction .14 14 5.2 Location deviation model .15 15 5.3 Using the calibration results.16 16 6 Distance calibration methods17 17 6.1 General.17 18
23、 6.2 External source method.17 19 6.2.1 Short description and advantage 17 20 6.2.2 Equipment .17 21 6.2.3 Calibration of the equipment 18 22 6.2.4 Measurement procedure 19 23 6.2.5 Calculations and results.20 24 6.2.6 Uncertainties .21 25 6.3 Concatenated fibre method22 26 6.3.1 Short description a
24、nd advantages 22 27 6.3.2 Equipment .23 28 6.3.3 Measurement procedures.24 29 6.3.4 Calculations and results.24 30 6.3.5 Uncertainties .25 31 7 Vertical scale calibration General.26 32 7.1 Introduction .26 33 7.2 Backscattered power calibration 27 34 7.2.1 Determination of the displayed power level
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