在一个流量控制系统中同时设计实现确保服务、奖赏服务、尽力而为服务三种业务类型，可以同时满足不同的流量控制需求。
The traffic control system have Premium Services and Assured Services and Best Effort Service, it can meet different traffic control requirements.
层次式交换网络支持三种类型服务：虚拟专线业务、确保服务和尽力而为。
The QoS model for HSNet includes three sorts of service: virtual leased line, assured forwarding and best effort.
随着各种新兴业务的开展，IP网络尽力而为的服务方式无法满足网络中很多业务，特别是实时业务的服务需求。
With the development of rising services , the Best Effort service of IP network can't satisfy much services, especially the real time services.
随着各种新兴业务的开展，IP网络尽力而为的服务方式无法满足网络中很多业务，特别是实时业务的服务需求。
With the development of rising services , the Best Effort service of IP network can't satisfy much services, especially the real time services.
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