of full concatenation of the SONET payload and ATM bandwidth management also gives carriers the ability to offer new data services, such as virtual private network services at native LAN speeds.

• SONET负荷的全部连入与ATM带宽管理的结合也给予了电话公司提供新型数据服务的能力，如以本地局域网的速度提供虚拟专网服务。