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在大型计算机或某些微型计算机上,往往配有多台终端,如键盘字符显示终端和键盘字符针型打印终端.应用计算机的很多场合,如:数据收集、物资管理、资料检索、办公室自动化等须将这些终端远置机房,本文介绍的基带传输机,就是应这种需要而研制的.该机适配EIA-RS-232C或CCITT·V_(24)接口,以四线全双工方式工作,用0.5φ市话线可连接5KM距离,传输速率在0～9.6kb/s任选,误码率低于10_(-6).使用联接如图1.
In large computers or some microcomputers, often with multiple terminals, such as keyboard character display terminal and keyboard character pin-type terminal.Application of computer in many occasions, such as: data collection, materials management, data retrieval, office automation, etc. These terminals should be far away from the engine room, the baseband transmitter described in this article is developed to meet the needs of this machine to adapt to EIA-RS-232C or CCITT · V 24 interface, four-wire full-duplex work , With 0.5φ local telephone line can be connected to 5KM distance, the transmission rate of 0 ~ 9.6kb / s optional, bit error rate less than 10 _ (- 6).