Conceptually, the logical volume layer sits between the application and physical layers.
从概念上讲，逻辑卷层位于应用程序层和物理层之间。
Because RPR is a layer 2 MAC-based technology, it can operate over multiple physical layers, including SONET.
由于RPR是第二层基于MAC的技术，所以它能在多个物理层上工作，包括SONET。
The design of MAC protocol can be improved by extracting information in network and physical layers.
通过提取网络层和物理层中的一些信息，可以改进MAC(介质访问控制)层协议的设计。
This paper analyzes the main problems of product data exchange using IGES with the idea that data exchange on both logic and physical layers.
本文分析了IGES在数据交换中存在的主要问题，提出了产品数据在逻辑和物理两个层次上进行交换的思想。
This paper analyzes the main problems of product data exchange using IGES with the idea that data exchange on both logic and physical layers.
本文分析了IGES在数据交换中存在的主要问题，提出了产品数据在逻辑和物理两个层次上进行交换的思想。
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