此外，PDSN也可以同时作骨干网的PE, PDF在BCF和PDSN之间传递资源状态信息和承载控制信息。

In addition, PDSN can also be as PE and PDF for transferring information of resource state and information of carrying control between BCF and PDSN.

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应用服务器不仅负责承载和执行服务，而且还要使用SIP协议提供针对控制层的接口。

The application servers are not only responsible for hosting and executing the services, but also provide the interface against the control layers using the SIP protocol.

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APC的工作是基于对系统的需求控制承载指定应用程序的集群大小。

The APC's job is to control the size of the cluster hosting a given application based on the demand on the system.

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