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前言脉码调制(PCM)通信比目前常用载波通信具有抗干扰性强、信号再生而不积累失真,适应性强和保密性强的优点。随着现代科学发展,通信网将向程控化、数字化和综合化的方向不断发展,而市话则是现代通信的基础。由于我国目前市内通信仍以电话通信为主,而数字通信又是发展方向,故需一种数、模兼容的市内通信电缆。本文着重介绍一种以模拟通信为主、兼容开通45个系统的脉码调制POM-30/32路
Introduction Pulse code modulation (PCM) communication has the advantages of strong anti-jamming, signal regeneration without distortion, adaptability and confidentiality than the common carrier communication. With the development of modern science, communication networks will continue to develop in the direction of digitalization and integration, while local calls will be the basis for modern communications. As China’s current city communications are still mainly telephone communications, and digital communications is the direction of development, it requires a number of modules compatible with the city’s communications cables. This article focuses on a simulation-based communications, open 45 systems compatible pulse code modulation POM-30/32 Road