近几年来，各铁路局陆续开通了无线列调“大三角”通信系统，因此“大三角”通信系统的维护管理工作就成为一个重要课题。现简要介绍我局5年来，就TW－12A型“大三角”通信系统维护管理过程中，遇到的问题及采取的措施和做法。ITW－12A型“大三角”通信系统的构成和功能1991年 In recent years, the railway administrations have successively launched the wireless delta communication system. Therefore, the maintenance and management of the “big delta” communication system has become an important issue. In the past five years, I briefly introduced the problems encountered in the maintenance and management of the TW-12A “big triangle” communications system and the measures and measures it has taken. Composition and Function of ITW-12A “Big Triangle” Communication System 1991