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。
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.
在第一次设置系统时，对于磁盘的配置，可以从最底层(物理层)开始，然后是设备层、逻辑卷、文件系统、文件和应用程序。
When first setting up your systems, start from the bottom (the physical layer) as you configure your disk, the device layer, its logical volumes, file systems, and the files and application.
甚至物理卷本身也是逻辑层的一部分，因为物理层仅包含实际的磁盘、设备驱动程序和任何可能配置的阵列。
Even your physical volumes themselves are part of the logical layer, as the physical layer only encompasses the actual disks, device drivers, and any arrays that you might have already configured.
本文描述了HART协议物理层的设备类型，配置准则，以及一些特性。
The article describe device type, configuration rule and characters of the physical Layer of HART protocol.
但在一些以小型手持设备为终端的自组网应用系统中物理层无法提供载波感知。
But the physics layer of some small hand-hold equipments can not provide carrier sense.
在第一次设置您的系统时，对于磁盘的配置，可以从底层(物理层)开始，然后是设备层、逻辑卷、文件系统、文件和应用程序。
When first setting up your systems, start from the bottom (the physical layer) as you configure your disk, the device layer, its logical volumes, file systems, and the files and application.
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.
物理层将内容从缓冲区传输到存储设备。
The physical layer transfers content from the buffer to the storage device.
由于以太网中的各种设备必需通物理层接口器件才能与网络传输介质相连，因此本部分主要介绍物理层器件。
Because all kinds of equipments in Ethernet must be though the physical layer interface devices can connected with network transmission media, thus this part mainly introduces the physic...
逻辑层分配了一个用来写数据到存储设备的缓冲区，物理层管理对存储设备的访问。
The logical layer allocates a buffer to use to write data to a storage device. The physical layer manages access to the storage device.
逻辑层分配了一个用来写数据到存储设备的缓冲区，物理层管理对存储设备的访问。
The logical layer allocates a buffer to use to write data to a storage device. The physical layer manages access to the storage device.
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