基于DSP+CPLD的新型G.703同向接口转换装置

New-style G.703 codirectional interface converter based on DSP+CPLD

电力系统通信中常用的脉冲编码调制PCM(PulseCodeModulation)复用设备不仅能提供语音接口,同时也能提供符合ITU-TG.70364kbit/s同向接口标准的数据接口。这种数据接口能提供比Modem更高的通信速率。然而,由于接口匹配上的原因,用户在使用该接口时往往需要专用的转换装置进行接口转换。提出并实现一种新型的基于数字信号处理器DSP(DigitalSignalProcessor)+复杂可编程逻辑器件CPLD(ComplexProgrammableLogicDevice)的G.703同向接口转换装置。其突出优点在于能给用户数据端提供一个高速的通用异步串行口,为用户的通信接入提供一种灵活而廉价的解决方案。

The common PCM(Pulse Code Modulation)multiplexing equipments used in communi-cation of power systems can supply not only telephone interfaces,but also digital interfaces satisfying the standard of ITU-T Recommendation G.703at the communication rate of64kbit /s.This kind of digital interface offers higher communication speed than Modem.However,in order to satisfy the matching requirements,customers often need to convert signals by special interface converters when using this kind interfaces.A new kind of G.703codirectional interface converter based on DSP(Digital Signal Processor)+CPLD(Complex Programmable Logic Device)is designed and realized.It provides a high-speed universal asynchronous serial port as a flexible and inexpensive solution for easy connecting the communication equipment with the PCM multiplexing equipment.