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.
各种网络设备驱动程序在接口层运行，该层从物理链路接收数据，并向物理链路传输数据。
The various network device drivers run at the interface layer, which receives and transmits data from and to the physical link.
大多数处于 SIR 模式的 IrDa 芯片是 UART 16650 兼容的（16650 是一种公共 PC UART），因此传统 Linux 串口驱动程序可以充当链路级别的驱动程序。
Most IrDa chips in the SIR mode are UART 16650-compatible (16650 is a common PC UART), so the legacy Linux serial port drivers can serve as link-level drivers.
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