08-30189351-DC.pdf
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1、a Date: 10 September 2008 Origin: European Latest date for receipt of comments: 14 November 2008 Project no.: 2008/02880 Responsible committee: GEL/86/1 Optical fibres and cables Interested committees: Title: Draft BS EN 60793-1-41 Optical fibres - Part 1-41: Measurement methods and test procedures
2、- Bandwidth Supersession information: If this document is published as a standard, the UK implementation of it will supersede BSEN60793-1-41 : 2003 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below)
3、. WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 14 November 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 sen
4、t. See overleaf for 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 limit
5、ed to dissemination 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 . British, International and foreign standards are also available from BSI Customer Services. Information on the
6、 co-operating 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 S
7、ervice on the BSI web site http:/. Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: 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 8.0 DPC: 08/30189351 D
8、C Licensed CopyChinese University of Hong Kong, 21/10/2008 08:41, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK took an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British S
9、tandard. If no comments are received to the contrary, then the UK will approve this draft and implement it as a British Standard. Comment is particularly welcome on national legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives
10、 the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft.
11、 Submission The guidance given below is intended to ensure that all comments receive efficient 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
12、 Secretary at the address given on the front cover. Comments should be compatible with Version 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 requireme
13、nts. All comments submitted should be presented as given in the example below. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/ Template for comments and secretariat observations Date: xx/xx/200x
14、Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 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 Defi
15、nition is ambiguous and needs clarifying. Amend to read . so that the mains connector 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. Micr
16、osoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:41, Uncontrolled Copy, (c) BSI FORM CD (IEC) 2008-08-01 86A/1239/CD COMMITTEE DRAFT (CD) IEC/TC or SC: SC 86A Project number IEC 60793-1-41 Ed.
17、 3.0 Title of TC/SC: Fibres and Cables Date of circulation 2008-09-05 Closing date for comments 2008-12-05 Also of interest to the following committees Supersedes document 86A/1238/MCR Proposed horizontal standard Other TC/SCs are requested to indicate their interest, if any, in this CD to the TC/SC
18、 secretary Functions concerned: Safety EMC Environment Quality assurance Secretary: Mr. Guy Perrot - France Email: THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE. IT SHOULD NOT BE USED FOR REFERENCE PURPOSES. RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICAT
19、ION OF ANY RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION. Title: IEC 60793-1-41 Ed. 3 : Optical fibres - Part 1-41: Measurement methods and test procedures - Bandwidth (Titre) : Introductory note Copyright 2008 International Electrotechnical Commission, IEC.
20、All rights reserved. It is permitted to download 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 withou
21、t permission in writing from IEC. Licensed CopyChinese University of Hong Kong, 21/10/2008 08:41, Uncontrolled Copy, (c) BSI 86A/1239/CD 2 CONTENTS Page FOREWORD 4 1 Scope6 2 Normative references .6 3 Definition .6 3.1 Bandwidth (-3 dB) 6 4 Apparatus 7 4.1 Radiation source7 4.1.1 Optical time domain
22、 measurement method (pulse distortion measurement) (method A).7 4.1.2 Frequency domain measurement method (method B).7 4.1.3 For both methods.7 4.2 Launch system.7 4.2.1 Overfilled launch (OFL) 7 4.2.2 Restricted mode launch (RML)8 4.3 Detection system .9 4.4 Recording system 9 4.5 Computational equ
23、ipment .9 4.6 Overall system performance .9 5 Sampling and specimens 10 5.1 Test sample.10 5.2 Reference sample 10 5.3 End preparation .10 5.4 Test sample packaging.10 5.5 Test sample positioning10 6 Procedure10 6.1 Method A Pulse distortion method (optical time domain) input pulse measurement10 6.1
24、.1 Input pulse measurement method A-1: reference sample from test sample 10 6.1.2 Input pulse measurement method A-2: Periodic reference sample 11 6.2 Method B Frequency domain measurement method 11 6.2.1 Method B-1: Reference length from test specimen .11 6.2.2 Method B-2: Reference length from sim
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