1. Reliability,Availability and Serviceability -- 可靠性、可用性及可维修性
2. Remote Access Server -- 远程接入服务器
3. Remote Access Service -- 远程接入服务
4. Replication-At-Sending -- 发端重复
5. Route Accounting Subsystem -- 路由记帐分系统
6.RAS--Registration, Admission, and Status--登录，准入和状态
