数据电路暨数字调制解调器(dsu)由本公司供租与维护。用户终端设备(CPE)由用户自备与维护。

Data Circuit and Data Service Unit (DSU) are provided and maintained by CHT while the customer Premises Equipment (CPE) is provided and maintained by the customer.

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数字调制解调技术在数字通信中占有非常重要的地位，常用的数字调制有：移频键控(FSK)和移相键控(PS K)等。

Digital mod technology in the digital communication occupies a very important position, commonly used digital modulation are: frequency shift keying (FSK) and phase-shift keying (PSK), and so on.

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接着介绍了遥控遥测常用的数字调制信号的软件调制解调的数学模型和实现方法。

Then, the paper introduces the math module and achieving method of software modulation and demodulation of common digital modulating signals used in telecontrol & telemetry system.

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