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筹建中的我国信息大通道——公用数字数据网(DDN)不久前已进入工程施工。这一工程是为适应信息高速度传输而兴建的。它能有效地提高现有电路的利用率,满足日益增多的电信新业务的要求。公用数字数据网,是利用数字数据交叉连接设备(DXG)以及终端设备在现有长途电路上组成的以传输数据信号为主的传输网,它可为用户提供2Mb/s以下各种速率的数字通道,可用于传输各类
Planning to build China’s information channel - the Common Digital Data Network (DDN) recently entered the construction. This project was built to accommodate the high-speed transmission of information. It can effectively improve the utilization of existing circuits to meet the growing demand for new telecommunications services. Public digital data network, is the use of digital data cross-connect equipment (DXG) and the terminal equipment in the existing long-distance circuit to transmit data signals based transmission network, which can provide users with 2Mb / s the following figures at various rates Channel, can be used for transmission of various types