针对长江南京通信管理局外部接入点的日益增多,传输链路备份变得越来越重要,而布放光缆实现双路由备份或者租用运营商电路备份都有费用高、周期长、缺乏灵活性的缺点。本文主要介绍了3G备网的优缺点,使用需求及应用方案几个方面内容。 In view of the increasing number of external access points of the Nanjing Communications Administration of the Yangtze River, transmission link backup becomes more and more important. However, laying optical cables for dual-route backup or leasing of carrier circuit backups is costly, long-term and inflexible Shortcomings. This article introduces the pros and cons of 3G backup network, the use of the requirements and application aspects of several aspects.