Abstract: Based on ARM7, a remote monitoring system for fixed telephone private network is developed and designed to solve the problem that the data of a certain communication private network cannot be collected and processed by the remote computer. AT91SAM7S64 is selected as the microprocessor, and the host communicates with it through the USB2.0 interface, and the data is collected in an asynchronous serial manner; the hardware module constructs MT8880 and MT88E39 dedicated chips and related peripheral circuits to complete the encoding and decoding of dual-tone multi-frequency (DTMF) and frequency shift keying FSK signals; based on C language, the software design of ARM firmware program and user program is completed. Experiments show that the system has low cost and stable operation.
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