ITU-T X 57-1988 METHOD OF TRANSMITTING A SINGLE LOWER SPEED DATA CHANNEL ON A 64 kbit s DATA STREAM《在64kbit s数据流中单个低速数据信道的传输方法》.pdf

上传人:twoload295 文档编号:805256 上传时间:2019-02-04 格式:PDF 页数:3 大小:42.70KB
下载 相关 举报
ITU-T X 57-1988 METHOD OF TRANSMITTING A SINGLE LOWER SPEED DATA CHANNEL ON A 64 kbit s DATA STREAM《在64kbit s数据流中单个低速数据信道的传输方法》.pdf_第1页
第1页 / 共3页
ITU-T X 57-1988 METHOD OF TRANSMITTING A SINGLE LOWER SPEED DATA CHANNEL ON A 64 kbit s DATA STREAM《在64kbit s数据流中单个低速数据信道的传输方法》.pdf_第2页
第2页 / 共3页
ITU-T X 57-1988 METHOD OF TRANSMITTING A SINGLE LOWER SPEED DATA CHANNEL ON A 64 kbit s DATA STREAM《在64kbit s数据流中单个低速数据信道的传输方法》.pdf_第3页
第3页 / 共3页
亲,该文档总共3页,全部预览完了,如果喜欢就下载吧!
资源描述

1、INTERNATIONAL TELECOMMUNICATION UNION)45G134 8 TELECOMMUNICATIONSTANDARDIZATION SECTOROF ITU05“,)#G0G0$!4!G0G0.%47/2+342!.3-)33)/. G0G03).!,).G0G0!.$G0G037)4#().-%4(/$G0G0/(b) that Recommendation X.50 defines some envelope data formats which can be used in public datanetworks;(c) that the use of a f

2、ull 64 kbit/s data stream for the transmission of a single lower speed synchronous datachannel may be economically attractive in some applications, when a low cost 64 kbit/s channel is available;(d) that for customer access to circuit switched data services in the ISDN, a method for adaption ofsynch

3、ronous user data rates to a 64 kbit/s bearer rate is defined in Recommendation X.30, but that in certainapplications as mentioned under (c) a simpler method is preferred,unanimously declaresthat for networks using a 6 + 2 envelope structure, a single low speed synchronous data channel (i.e. 600,2400

4、, 4800, 9600 bit/s) shall be transmitted through a 64 kbit/s data stream by using the following method:The 6 + 2 envelopes related to the low speed channel shall be repeated as many times as required to reach the64 kbit/s speed.The receive end can recover the original data signal by taking out of th

5、e received 64 kbit/s stream an envelopefor every envelope period of the chosen data rate.In the networks which transmit the 8 kHz envelope timing, no alignment circuit is required in the receiver; inthe networks not transmitting the 8 kHz timing, the alignment is obtained by transmitting an alignment pattern in theframing bit position of each envelope. When the framing bit is not used for alignment, it is available to transmithousekeeping information or, when this is not required, it is set to zero. Further study is needed for the case of 8 + 2envelope structure.

展开阅读全文
相关资源
猜你喜欢
  • DIN EN ISO 294-4 Berichtigung 1-2011 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 Determination of moulding shrinkage (ISO 294-4 2001) German.pdf DIN EN ISO 294-4 Berichtigung 1-2011 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 Determination of moulding shrinkage (ISO 294-4 2001) German.pdf
  • DIN EN ISO 294-4-2003 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 Determination of moulding shrinkage (ISO 294-4 2001) German version EN ISO.pdf DIN EN ISO 294-4-2003 Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4 Determination of moulding shrinkage (ISO 294-4 2001) German version EN ISO.pdf
  • DIN EN ISO 295-2004 Plastics - Compression moulding of test specimens of thermosetting materials (ISO 295 2004) German version EN ISO 295 2004《塑料 热固性材料试样的压模塑法》.pdf DIN EN ISO 295-2004 Plastics - Compression moulding of test specimens of thermosetting materials (ISO 295 2004) German version EN ISO 295 2004《塑料 热固性材料试样的压模塑法》.pdf
  • DIN EN ISO 3001-1999 Plastics - Epoxide compounds - Determination of epoxide equivalent (ISO 3001 1999) German version EN ISO 3001 1999《塑料 环氧化合物 环氧基当量的测定》.pdf DIN EN ISO 3001-1999 Plastics - Epoxide compounds - Determination of epoxide equivalent (ISO 3001 1999) German version EN ISO 3001 1999《塑料 环氧化合物 环氧基当量的测定》.pdf
  • DIN EN ISO 3035-2012 Corrugated fibreboard - Determination of flat crush resistance (ISO 3035 2011) German version EN ISO 3035 2011《瓦楞纤维板 抗平压强度的测定(ISO 3035-2011) 德文版本EN ISO 3035-20.pdf DIN EN ISO 3035-2012 Corrugated fibreboard - Determination of flat crush resistance (ISO 3035 2011) German version EN ISO 3035 2011《瓦楞纤维板 抗平压强度的测定(ISO 3035-2011) 德文版本EN ISO 3035-20.pdf
  • DIN EN ISO 3037-2013 Corrugated fibreboard - Determination of edgewise crush resistance (unwaxed edge method) (ISO 3037 2013) German version EN ISO 3037 2013《瓦楞纤维纸板 边压强度的测定(边缘不涂蜡法).pdf DIN EN ISO 3037-2013 Corrugated fibreboard - Determination of edgewise crush resistance (unwaxed edge method) (ISO 3037 2013) German version EN ISO 3037 2013《瓦楞纤维纸板 边压强度的测定(边缘不涂蜡法).pdf
  • DIN EN ISO 3040-2016 Geometrical product specifications (GPS) - Dimensioning and tolerancing - Cones (ISO 3040 2016) German version EN ISO 3040 2016《几何产品规范(GPS) 尺寸和公差 锥体(ISO 3040-2.pdf DIN EN ISO 3040-2016 Geometrical product specifications (GPS) - Dimensioning and tolerancing - Cones (ISO 3040 2016) German version EN ISO 3040 2016《几何产品规范(GPS) 尺寸和公差 锥体(ISO 3040-2.pdf
  • DIN EN ISO 305-1999 Plastics - Determination of thermal stability of poly(vinyl chloride) related chlorine-containing homopolymers and copolymers and their compounds - Discoloratio.pdf DIN EN ISO 305-1999 Plastics - Determination of thermal stability of poly(vinyl chloride) related chlorine-containing homopolymers and copolymers and their compounds - Discoloratio.pdf
  • DIN EN ISO 3059-2013 Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing conditions (ISO 3059 2012) German version EN ISO 3059 2012《无损检测 渗透法检验和磁粉检验 .pdf DIN EN ISO 3059-2013 Non-destructive testing - Penetrant testing and magnetic particle testing - Viewing conditions (ISO 3059 2012) German version EN ISO 3059 2012《无损检测 渗透法检验和磁粉检验 .pdf
  • 相关搜索
    资源标签

    当前位置:首页 > 标准规范 > 国际标准 > 其他

    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