也就是说，编码数据包对丢包较不敏感，因而有助于提升传输的可靠性。
In other words, coded packet is less sensitive to loss, which indicates its possibility to improve transmission reliability.
操作系统会因为一个硬件事件而产生中断(例如出现了一个来自网卡的数据包)，对该事件的处理过程从一个中断开始。
When an operating system is interrupted because of a hardware event (such as the presence of a packet through a network adapter), the processing begins in an interrupt.
数据包指示符（对UART接口而言）为4
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