i DEN VPN解决方案 ,是通过专网或 Internet网接入 ,来提供 i DEN数字集群 VPN客户相对独立的开户、用户信息及部门管理等营运系统业务 ,是对 i DEN数字集群作为公网而不具备专网用户使用的一种补充。本文着重介绍了 i DEN VPN的概念 ,体系结构及组网策略 ,并对大唐无线 i DEN VPN子系统的功能进行了描述 i DEN VPN solution is to provide i DEN digital trunking VPN customers with relatively independent operating systems such as account opening, user information and departmental management through the private network or Internet access, With a special network users to use a supplement. This article focuses on i DEN VPN concept, architecture and networking strategy, and Datang wireless i DEN VPN subsystem functions described