Services are enforced and policed on the edges of the network via the SR/PE device. Service comprises of soft-switch, video conference, VPN. Internet, ATM/FR/DDN etc.

• 所有业务在边缘实现，只能通过业务路由器（SR/PE）接入，包括软交换、视频会议、VPN业务、互连网专线、ATM/FR/DDN业务接入等等。