本文分析日本NEC公司生产的PCM数字微波设备的基群、二次群、三次群的帧结构型式，为正确选择和使用国内、外不同公司或生产厂家的数字微波设备提供一点参考。1基群［30／32路制式」帧结构PCM数字微波的通信原理是把语音信号经过取样、量化、编码后变成一组组用8位码字来代替原 This paper analyzes the frame structure types of primary, secondary and tertiary groups of PCM digital microwave equipment produced by Japan NEC Company, which provides a little reference for the correct selection and use of digital microwave equipment of domestic and foreign companies or manufacturers. 1 基 群 [30/32 Road System] frame structure PCM digital microwave communication principle is the voice signal after sampling, quantization, encoding into a group with 8-bit codeword instead of the original