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14.共用电信网 公用电信网 public telecommunication network 本地环路 local loop 交换节点 switching node 双绞线 twisted pair 外部呼叫 external call 端局 end office 数字数据系统 digital data systems 二线连接 two wire connection 收费中心 toll center 电路交换网 circuit-switching network 电话用户 telephone subscriber 数据流量 data traffic 链路 link 中继线 trunk 半双工的 half-duplex 全双工的 full-duplex 中间交换节点 intermediate switching node 音频电路 voice-frequency circuit 汇接交换机 tandem switch 拓扑 topology 接点间的 internode 路由 route 全双工的连接 full-duplex connection 集中话务量的功能 the funcion of concentrating traffic 被称为汇接交换机的交换节点 the switching node called tandem switch 一小部分用户 a fraction of subscribers 在站和网络之间的接口 the interface between the station and the network 发送数字信号的用户 the subscriber that transmit digital signal 国家网络 national network 结构部件 architectural components 接点间的支路 the branches between nodes 树状拓扑 tree topology 传输设备 transmission facilities 多条音频电路 multiple voice-frequency circuits 同步时分复用 synchronous TDM 相邻的端局 adjacent end offices 全连通性 full connectivity 被分离开的子网 isolated subnetworks 高效中继线 high-usage trunks 路由选择的基本次序 basic order of selection 主干体系网络 backbone hierarchical network 连到不同端局的俩个用户 two subscribers attached to different office 交换区 exchange area 15.综合业务数字网 全球通信 global communications 灵活性 flexibility 端到端的数字连接 end-to-end digital connectivity 开放网络 open network 语声编码 voice encoding 综合业务数字网 integrated services digital network 系统结构 infrastructure 国际标准化组织International Organization for Standardization 通信载体 communication carriers 传输媒体 transmission medium 接口设备 interface equipment 带宽限制 bandwidth limitation 交换设备 switching equipment 语音编码 voice encoding 脉码调制 pulse code modulation 基本接入 basic access 综合业务数字网 the integrated services digital network 国际标准化组织 the International Organization for Standardization 由于传输媒体导致的质量下降 degradation due to the transmission medium 4kHz话路中所固有的带宽限制 bandwidth limitations inherent in a 4kHz voice channel 标准化的接口 standardized ports 脉（冲编）码调制 pulse code modulation 数字通信 digital communication ISDN的标准和系统结构 ISDN standards and system architecture 全球通信 global communication 数字技术的逐步应用 progressive application of digital technology 共同通信载体 public communication carriers 高质量 enhanced quality 大量的接口设备 substantial quantity of interface equipment 在传送话音、数据、视频和其他业务上的灵活性 flexibility in the transmission of voice , data , video and other services 带宽的限制 bandwidth limitations 端到端的数字连接 end-to-end digital connectivity 语音编码技术 voice encoding techniques 基本接入信令速率 basic access signaling rate 统一的接入 universal access 试验性的技术 experimental technology 16.电信世界的业务和未来 X.25协议 X.25 protocol 电视信号 television signals 宽带业务 narrowband services 基本接入 basic access 电信业务 teleservice 用户电报 telex 无线电波 radio waves 地面天线 ground antenna 同轴的 coaxial 直接广播系统 direct broadcast system 端到端的时延 end-to-end delay 抖动 jitter 繁忙小时 peak hours 芯片技术 chip technology 高清晰度电视 high definition television 运行也维护 operations and maintenance 现有的公用网络 the existing public network 传统的双向对话 classical two-way voice conversation 基于X.25协议的分组交换数据网络 packet switched data network based onX.25 porotocols对网络的拥护接入 the user access to the network 对网络的拥护接入 the user access to the network 信道速率为70 Mbit/s的电路交换业务 a circuit switched service with a channel rate of 70 Mbit/S 与业务无关的网络 the service-independent network 对资源的最佳统计共享 the optimal statistical sharing of the resources 电信业务 telecommunication service 用户电报网 telex network 文字报 messages of characters 双向对话 two-way voice conversation 同轴树状网络 coaxial tree network 公用天线的电视网络 community antenna TV network 直接广播系统 16 direct broadcast system 以太网 Ethernet 令牌总线网和令牌环网 token bus and token ring network 全球范围的独立网络 world-wide independent networks 电话网络的繁忙小时 the peak hours in the telephone network 资源共享 resource pooling 繁忙小时流量 23 peak hour traffic 窄带业务的综合 integration of narrow-band services 在语声编码和芯片技术方面的进步 the progress in speech coding and chip technology 新的电信业务 a new teleservice 对新业务要求的适配 adapting to new service requirements
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