以下为句子列表：
英文: Abstract: Combining the Tenth Five_Year Plan of Tianjin Telecommunication, the paper states some problems relating to the planning of the local telephone switching network in the new period, such as the situation that was faced for the telecommunication n
中文: 文摘:结合天津电信“十五”规划的编制，阐述了在新时期本地电话交换网规划中所涉及的几个问题，如电信网面临的形势和规划中需要解决的重大课题、电话业务持续发展的问题及由窄带网向宽带网过渡的问题等等。
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英文: China TieTong's switchingnetwork for long distance telephone covered 30 provincial capitals all over the country and switching network for local telephone covered more than 500 large or middle cities, more than 700 counties or towns, opened more than 1000
中文: 中国铁通长途电话交换网覆盖了全国30个省会城市，本地电话网已经覆盖全国500多个大中城市、700多个县乡镇，开通交换局1000余个，全国有200多个城市与其他电信运营商实现互联互通，开通电话业务。
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英文: The physical structure, physical layer protocol and multiple optimized opto-electronic and electronic to electronic design schemes for the next generation of cable digital TV optic packet switching network are discussed in the light of the generation of o
中文: 摘要从光分组的产生、编码方案、光分组的再生、光分组同步以及光分组交换的流量分配等入手，讨论了下一代有线数字电视光分组交换网络的物理结构、物理层协议配置及光－电、电－电的多种优化设计方案。
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