ITU-T V 1-1988 EQUIVALENCE BETWEEN BINARY NOTATION SYMBOLS AND THE SIGNIFICANT CONDITIONS OF A TWO - CONDITION CODE《二进制表示法的符号与双态码两个有效状态之间的对等关系-电话网络上的数据交流 第IX研究组 第2页》.pdf
《ITU-T V 1-1988 EQUIVALENCE BETWEEN BINARY NOTATION SYMBOLS AND THE SIGNIFICANT CONDITIONS OF A TWO - CONDITION CODE《二进制表示法的符号与双态码两个有效状态之间的对等关系-电话网络上的数据交流 第IX研究组 第2页》.pdf》由会员分享,可在线阅读,更多相关《ITU-T V 1-1988 EQUIVALENCE BETWEEN BINARY NOTATION SYMBOLS AND THE SIGNIFICANT CONDITIONS OF A TWO - CONDITION CODE《二进制表示法的符号与双态码两个有效状态之间的对等关系-电话网络上的数据交流 第IX研究组 第2页》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 6 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU$!4!G0G0#/-5.)#!4)/./6%2G0G04(%G0G04%,%0(/.%G0G0.%47/2+%15)6!,%.#%G0G0“%47%.G0G0“).!29G0G0./4!4)/.39-“/,3G0G0!.$G0G04(%G0G03).) amended at Geneva, 1964 and I972)Binary numbering expresses numbers by means of
2、two digits normally represented by the symbols 0 and 1.Transmission channels are especially well suited to the transmission of signals by a modulation having two significantconditions (two-condition modulation). These two significant conditions are sometimes called “space“ and “mark“ or“start“ and “
3、stop“, or they may be called condition A or condition Z 1.It is very useful to make the two conditions of a two-condition modulation correspond to the binary digits 0and 1. Such equivalence will facilitate the transmission of numbers resulting from binary calculation, the conversion ofcodes for bina
4、ry numbers and of codes for decimal numbers, maintenance operations and relations betweentransmission personnel and the personnel in charge of data-processing machines.At first sight, it does not seem to matter whether the symbol 0 corresponds in transmission to condition A orcondition Z, the symbol
5、 1 then corresponding to condition Z or condition A or vice versa.In telegraphy, however, when a telegraphic communication is set up and the sending of signals is stopped(called the idle condition of the line), the signal sent over the line consists of condition Z throughout the suspension oftransmi
6、ssion.It is logical (and for certain VF telegraph systems also essential) to use the same rule in data transmission.During the “idle periods“ of transmission, condition Z should be applied to the circuit input.Data transmission on a circuit is often controlled by perforated tape. On perforated tapes
7、 used for telegraphy,condition Z is represented by perforation. When binary numbers are represented by means of perforations, it iscustomary to represent the symbol 1 by a perforation. It is therefore logical to make this symbol 1 correspond tocondition Z.For these reasons, the CCITTunanimously decl
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ITUTV11988EQUIVALENCEBETWEENBINARYNOTATIONSYMBOLSANDTHESIGNIFICANTCONDITIONSOFATWOCONDITIONCODE 二进制 表示

链接地址:http://www.mydoc123.com/p-804171.html