ITU-T G.651-1998 Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm

pdf标准 ITU-T G.651-1998 Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm

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ITU-T G.651-1998  Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm 第 1 页 ITU-T G.651-1998  Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm 第 2 页 ITU-T G.651-1998  Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm 第 3 页 ITU-T G.651-1998  Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm 第 4 页 ITU-T G.651-1998  Characteristics of a 50/125 Micrometer Multimode Graded Index Optical Fibre Cable - Series G: Transm 第 5 页
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INTERNATIONAL TELECOMMUNICATION UNION ITU-T G.651 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (02/98) SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS Transmission media characteristics – Optical fibre cables Characteristics of a 50/125 µm multimode graded index optical fibre cable ITU-T Recommendation G.651 (Previously CCITT Recommendation) ITU-T G-SERIES RECOMMENDATIONS TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS INTERNATIONAL TELEPHONE CONNECTIONS AND CIRCUITS INTERNATIONAL ANALOGUE CARRIER SYSTEM GENERAL CHARACTERISTICS COMMON TO ALL ANALOGUE CARRIERTRANSMISSION SYSTEMS INDIVIDUAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON METALLIC LINES GENERAL CHARACTERISTICS OF INTERNATIONAL CARRIER TELEPHONE SYSTEMS ON RADIO-RELAY OR SATELLITE LINKS AND INTERCONNECTION WITH METALLIC LINES COORDINATION OF RADIOTELEPHONY AND LINE TELEPHONY TESTING EQUIPMENTS TRANSMISSION MEDIA CHARACTERISTICS General Symmetric cable pairs Land coaxial cable pairs Submarine cables Optical fibre cables Characteristics of optical components and sub-systems DIGITAL TRANSMISSION SYSTEMS TERMINAL EQUIPMENTS DIGITAL NETWORKS DIGITAL SECTIONS AND DIGITAL LINE SYSTEM For further details, please refer to ITU-T List of Recommendations. G.100–G.199 G.200–G.299 G.300–G.399 G.400–G.449 G.450–G.499 G.600–G.609 G.610–G.619 G.620–G.629 G.630–G.649 G.650–G.659 G.660–G.699 G.700–G.799 G.800–G.899 G.900–G.999 ITU-T RECOMMENDATION G.651 CHARACTERISTICS OF A 50/125 µm MULTIMODE GRADED INDEX OPTICAL FIBRE CABLE Summary This Recommendation covers the geometrical and transmissive properties of multimode fibres having a 50 µm nominal core diameter and a 125 µm nominal cladding diameter. Test methods and the meanings of the terms used are in clauses 6 and 2 respectively. Source ITU-T Recommendation G.651 was revised by ITU-T Study Group 15 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 10th of February 1998. FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-T’s purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. © ITU 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ii Recommendation G.651 (02/98) CONTENTS Page 1 Scope .......................................................................................................................... 1 2 Definitions.................................................................................................................. 1 3 Fibre characteristics.................................................................................................... 3 3.1 Geometrical characteristics of the fibre...................................................................... 3 3.1.1 Core diameter................................................................................................ 3 3.1.2 Cladding diameter ....................................

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