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随着电子计算机使用范围的不断扩大,为了满足用户使用计算机实时性、独用性和经济性的要求,计算机网络正在迅速的发展。从我国目前情况来看,由于各种因素的影响,组建全国性远程网的条件尚不具备,但就一个地区或企业内组建计算机局部网络的工作,在一些地区和企业中正在进行。这种计算机局部网可实现本行业各种信息集于一体,提高管理水平。在组建计算机局部网和其他数据通信中,首先遇到的问题,就是数字信号的传输。对于远距离数字信号传输,要采用带有调制-解调器的频带传输模式来
With the expanding use of electronic computers, computer networks are rapidly developing in order to meet the real-time, unique and economical requirements of users using computers. Judging from the current situation in our country, due to various factors, the conditions for establishing a nationwide long-distance network are not yet available. However, the establishment of a local network of computers in a region or an enterprise is under way in some regions and enterprises. This local network of computers can achieve a variety of information gathered in the industry, improve management. The first problem encountered in setting up computer local networks and other data communications is the transmission of digital signals. For long-distance digital signal transmission, to use a modulation-demodulator band transmission mode