Therefore, Professor Qian Hualin put forward the idea of Hierarchically Switched Networks (HSNet).
为此，钱华林老师提出了层次式交换网络的思想。
The QoS model for HSNet includes three sorts of service: virtual leased line, assured forwarding and best effort.
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.
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。
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