本文介绍了一种新型的用户载波电话机.它是在分析了国内外同类设备,采众家之长,用全新的设计思想研制成的新型环路载波设备.在频谱安排上可与国内普遍采用的“1+1”环路设奋迭加开放,组成“1+2”系统.取消了传统的二/四线音频差接系统,提高了电路稳定度和清晰度指标.结构上将调制设备与用户话机合为一体,简化了铃流设备.设计中采用了先进的集成电路,工作可靠性高,电气性能好,并便于生产和维护.本文自一九八三年全国载波年会上发表后,文中提出的设计思想已被许多厂家采用,收到了良好的效果. This paper introduces a new type of subscriber carrier telephone which is a new type of loop carrier equipment developed by using new design ideas after analyzing the similar equipment at home and abroad, The “1 + 1” loop is designed to be “1 + 2” system, eliminating the traditional 2/4-wire audio differential connection system and improving the stability and clarity of the circuit. Equipment and user phone into one, simplifying the ring current equipment. Design uses advanced integrated circuits, high reliability, electrical performance, and easy to produce and maintain.This article from the National Carrier Annual Conference 1983 After the publication, the design ideas put forward in the paper have been adopted by many manufacturers and received good results.