ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ

pdf标准 ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ

18 页 0 下载 0 浏览 0 评论 0 收藏 3.0分
温馨提示:当前标准最多只能预览 10 页,若标准超出了 10 页,请下载原标准以浏览全部内容。
ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ 第 1 页 ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ 第 2 页 ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ 第 3 页 ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ 第 4 页 ITU-T K.50-2000 由网络供电的通信系统的工作电压和电流的安全限值 Safe Limits of Operating Voltages and Currents for Telecommunication Systems Powered over the Networ 第 5 页
下载标准到电脑,方便使用
还有 5 页未阅读,继续阅读
本标准由 5zbz2018-09-16 14:11:50上传分享

国外分类,ITU,ITU-T(电信标准分局),itu,网络,供电,通信,系统,工作,电压,工作电压,电流,安全,限值,safe,limits,of,operating,voltages,and,currents,for,telecommunication,systems,powered,over,the,networ

INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU K.50 (02/2000) SERIES K: PROTECTION AGAINST INTERFERENCE Safe limits of operating voltages and currents for telecommunication systems powered over the network ITU-T Recommendation K.50 (Formerly CCITT Recommendation) ITU-T RECOMMENDATION K.50 SAFE LIMITS OF OPERATING VOLTAGES AND CURRENTS FOR TELECOMMUNICATION SYSTEMS POWERED OVER THE NETWORK Summary This Recommendation provides guidance on voltages and currents that may safely be used to power telecommunication systems that are part of the network. These systems use the paired-conductor cables of the network or specific power feeding cables to provide power to equipment at remote locations. This equipment and the current carrying conductors can be accessed in the energized state by service personnel without using insulated gloves or tools. These systems are not intended to be part of the subscriber's installation, and are not accessible to users of the network. They are located in the networks between different telecommunication centres and between a telecommunication centre and public network interfaces. This Recommendation covers only systems that use continuous dc powering. Source ITU-T Recommendation K.50 was prepared by ITU-T Study Group 5 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 25 February 2000. Keywords Remote power feeding, safety. Recommendation K.50 (02/2000) i 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. ã ITU 2000 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 K.50 (02/2000) CONTENTS Page 1 Scope........................................................................................................................... 1 2 References................................................................................................................... 2 3 Abbreviations.............................................................................................................. 2 4 Definitions .................................................................................................................. 3 5 Voltage and current limits........................................................................................... 4 5.1 General........................................................................................................................ 4 5.2 Method 1: Voltage limited RFT circuits..................................................................... 4 5.3 Method 2: Current limited RFT circuits ..................................................................... 4 6 Work practices ............................................................................................................ 4 6.1 General work practices ........................

给标准打分
您好可以输入 255 个字符
本站的中文名字叫什么( 答案:找标准 )
评论列表
  • 暂时还没有评论,期待您的金玉良言