In network layer link bandwidth and available bandwidth capture the relevant properties of network path, which is baseline of performance management and QoS control.
网络层的链路带宽与有效带宽直接反映了端到端路径的基本状况，是对网络进行性能管理和服务质量控制的基础。
The structure of physical layer, link layer and application layer was applied in field-bus of network control, data was gained through cyclic query of principal and subordinate PC in link layer.
控制网络现场总线采用物理层、链路层和应用层结构。链路层以主从循环查询获取数据。
The structure of physical layer, link layer and application layer was applied in field-bus of network control, data was gained through cyclic query of principal and subordinate PC in link layer.
控制网络现场总线采用物理层、链路层和应用层结构。链路层以主从循环查询获取数据。
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