When devices are emulated, such as virtual network adapters, the emulation provides a layer to abstract away the physical hardware.
当设备被模拟(比如虚拟网络适配器)时，模拟提供一个抽象层以抽象物理硬件。
The link layer refers to the device drivers providing access to the physical layer, which could be numerous mediums, such as serial links or Ethernet devices.
链路层是指提供对物理层访问的设备驱动程序，这可以是各种介质，例如串口链路或以太网设备。
This caching layer optimizes access to the physical devices by keeping data around for a short time (or speculatively read ahead so that the data is available when needed).
这个缓存层通过将数据保留一段时间(或者随即预先读取数据以便在需要是就可用)优化了对物理设备的访问。
Using this integrated physical and link layer controller chip, PC can be connected to all kinds of 1394 video and audio devices according to 1394 bus.
结果表明，通过该接口转换电路能将个人的计算机按照1394电缆连接到各种1394视频音频设备。
The PHY (physical layer) provides the electrical and mechanical interface between the device and the cable and ensures that all devices have fair access to the bus.
物理层为设备提供了一个物理和电气接口，保证总线上的所有设备都能公平地访问总线。
The PHY (physical layer) provides the electrical and mechanical interface between the device and the cable and ensures that all devices have fair access to the bus.
物理层为设备提供了一个物理和电气接口，保证总线上的所有设备都能公平地访问总线。
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