从技术上讲，网络交换机工作在OSI模型的第二层（数据链路层）。
Technically, network switches operate at layer two (Data Link Layer) of the OSI model.
数据有线传输采用DQDB“链路层”模型。
DQDB link layer model was adopted in data lineate transmission.
分别给出物理层、数据链路层、应用层、用户层的模型实施方案及技术要点的设计思想。
Main points of the model implementing scheme and designing idea are respectively given for physical layer, data link layer, application layer and user layer.
本文介绍了Petri网和数据链路层协议的一个Petri网模型，并且用S不变式和T不变式证明了该网的活性及其它性质。
This thesis introduces the Petri net and the Petri net model of a data link layer protocol, and illustrates the properties of the net with S-invariant and T-invariant.
由于受数据链路层和物理层的影响，PP测量模型本身存在着固有的测量误差；当网络负载较重时，PP测量模型就不能够通过过滤算法得出正确的测量结果。
But the intrinsic error exists in PP model for the effect of the data link layer and physical layer, and the incorrect result is obtained by filter algorithm when the network load is heavy.
在开放系统互连(osi)参考模型的通信，媒体访问管理执行的媒体访问控制(mac)子层的链路层的。
In the Open Systems Interconnection (OSI) communication reference model, media access management is performed by the media access Control (MAC) sublayer of the Data-Link layer.
在开放系统互连(osi)参考模型的通信，媒体访问管理执行的媒体访问控制(mac)子层的链路层的。
In the Open Systems Interconnection (OSI) communication reference model, media access management is performed by the media access Control (MAC) sublayer of the Data-Link layer.
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