欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ITU-T F 30-1993 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service Telegraph Services (Study Group I) 5 pp《特殊目的的各种组合序列的使用 操作和服务质电报业务(.pdf

    • 资源ID:795626       资源大小:147.61KB        全文页数:5页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ITU-T F 30-1993 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service Telegraph Services (Study Group I) 5 pp《特殊目的的各种组合序列的使用 操作和服务质电报业务(.pdf

    1、CCITT RECMN*F-30 93 m 4862593 0576993 535 m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU OPERATIONS AND QUALITY OF SERVICE TELEGRAPH SERVICES F.30 (03/93) USE OF VARIOUS SEQUENCES OF COMBINATIONS FOR SPECIAL PURPOSES ITU-T Recommendation F.30 (Previousl

    2、y “CCITT Recommendation”) CCITT RECMN*F=30 93 4862593 0576972 Y53 FOREWORD The ITU Telecommunication Standardization Sector (1721-T) is a permanent organ of the International Telecom- munication Union. The 1721-T is responsible for studying technical, operating and tariff questions and issuing Recom

    3、mendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, established the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topi

    4、cs. ITU-T Recommendation F.30 was revised by the IT-T Study Group I (1988-1993) and was approved by the WTSC (Helsinki, March 1-12, 1993). NOTES 1 As a consequence of a reform process within the International Telecommunication Union (ITU), the CCITT ceased to exist as of 28 February 1993. In its pla

    5、ce, the I721 Telecommunication Standardization Sector (ITU-T) was created as of 1 March 1993. Similarly, in this reform process, the CCIR and the FRI3 have been replaced by the Radiocommunication Sector. In order not to delay publication of this Recommendation, no change has been made in the text to

    6、 references containing the acronyms “CCITT, CClR or IFRB” or their associated entities such as Plenary Assembly, Secretariat, etc. Future editions of this Recommendation will contain the proper terminology related to the new ITU structure. 2 telecommunication administration and a recognized operatin

    7、g agency. In this Recommendation, the expression “Administration” is used for conciseness to indicate both a O ITU 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, elecuonic or mechanical, including photocopying and microfilm, without p

    8、ermission in writing from the ITU. CCITT RECMNxF.30 93 m Y862571 057b993 398 m Recommendation F30 USE OF VARIOUS SEQUENCES OF COMBINATIONS FOR SPECIAL PURPOSES (Melbourne, 1988; revised Helsinki, 1993) The CCITT, unanimously declares that 1) when it is necessary to provide for switching of telegrams

    9、 to different routes in semi-automatic or fuiiy automatic telegram retransmission systems, the beginning and ending of each telegram are identified by the insertion of start-of-message and end-of-message signals; 2) the start-of-message signal consists of the sequence ZCZC in letter case; 3) the end

    10、-of-message signal consists of the sequence “N, in letter case; 4) the equipment that recognizes the start-of-message and end-of-message signals may be designed to do so by searching only for the sequence of four combinations corresponding to ZCZC or NNNN respectively (i.e. combinations 26, 3, 26, 3

    11、 or 14, 14, 14, 14 in International Telegraph Alphabet No. 2 regardless of whether they are in letter or figure case); 5) Table 1 lists other sequences of combinations used for special purposes. Recommendation F.30 (03D3) 1 CCITT RECMN*F-30 93 4862593 057b994 224 = 11 11 11 11 11 12 11 12 Purpose of

    12、 sequence KKKK ( R.79, R.79 bis KLKLA O0 s .4 Connection of reperforator Disconnection of reperforator or eauivalent device) 14 14 14 14 19 19 19 19 I Suppression of delay signals NNNN 9979 F.l, F.31, S.4, U.22 ssss S.15 IIII Switching a reader (or equivalent device) into circuit by remote control 2

    13、6 3 26 3 26 26 26 26 End of message or enabling of delay Change of alphabet zczc +: +: F.l, F.31 zzzz + F.200 I Error signal 13 13 13 13 (Note 2) (Note3) 1 MMMM (Note 3) 1 Start of message End of input s.4, u.44 Request for automatic advice of parties cleared prematurely during the broadcast cai1 fo

    14、llowed by call cleared 20 20 20 . (Note 4) 10 (Notes 4 and 5) Operator recall over radiotelegraph circuit T T T . 5 5 5 1 s .4 (Note 4) (Notes 4 and 5) J. a s.4, s.22 JL Stop transmission from distant auto terminal interngation of distant terminal I Follow-on call TABLE 1LF.30 Printed position Lette

    15、r case Figure case Recommendation reference Sequence of combination 6666 (Note 1) 8888 HHHH (Note 1) s.4, u.22 2424242424 I XXXXX I Illll I F.l (C111) 12121212 I LLLL I )I) I s.4,u.43 I NOTES 1 Administration. 2 3 4 Repeated if necessagr. 5 6 See also Table 2K.1. As noted in C5S.1, the figure case o

    16、f combinations 6, 7 and 8 is available for the internal service of each As noted in Recommendation U.44 this sequence is to be recognized in letter case only. A minimum of 4 Ms would clear a telex broadcast call. The usage of a 5th or more Ms is a national matter. Function only applicable in figure case. 2 Recommendation F.30 (0-3) CCITT RECMN*F-30 93 m 48b259L 05b995 LbO = Printed in Switzerland Geneva, 1993


    注意事项

    本文(ITU-T F 30-1993 Use of Various Sequences of Combinations for Special Purposes - Operations and Quality of Service Telegraph Services (Study Group I) 5 pp《特殊目的的各种组合序列的使用 操作和服务质电报业务(.pdf)为本站会员(cleanass300)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开