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.
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