为了使延迟和抖动减到最小，网络设备必须能够在语音数据包一到达时就进行处理，换句话说，就是严格的优先级方式。
To minimize delay and jitter, the network devices must be able to service voice packets as soon as they arrive, or in other words, in strict priority fashion.
如果控制器向设备发送了suspend信号，那么这个事件以最高优先级得到处理。
If the controller has sent a suspend signal to the device, this event gets processed with the highest priority.
有时你可能需要更改设备的启动优先级以便能够从光驱启动一个live版的Linxu发行版。
Occasionally you will need to change the device boot priority to be able to boot a live Linux distro from your optical drive.
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