实时数码数据传送专线 realtime digital datafeed
高速数据专线 High rate data lease line
市场数据传送专线 Market Datafeed
提升数码数据输送专线 enhanced digital datafeed
专线数据通信业务 Circuit Switching Data Communication Service
智能网上，明确地指定了服务用于语音，所有其他数据类型需要专线接入，或者烦人的调制解调器。
The Intelligent Network is tightly specified for voice. All other data types require special leased access lines, or awful kludges like modems.
这种接入方式降低了投入和应用的成本，又保证了DDN专线数据传输的速率和质量。
The new way not only lowered the cost of investment and application but also ensured the speed and quality of DDN data transmission.
服务器使用数据库技术管理数据，铁路各应用部门可在终端上通过专线或拨号线路随时查询数据。
The server stores and sorts all data on database. Any department of railway administration can browse data anytime on the terminal by dialup or leased line to server.
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