Specific parts of the Bluetooth protocol stack used by the profile.
配置文件使用的蓝牙协议栈的特定部分。
Like other profiles built on top of the serial port profile, the virtual serial link created by the lower layers of the Bluetooth protocol stack is transparent to applications using the DUN profile.
和其他建立在串口配置文件之上的配置文件一样，被更低层蓝牙通信协议实现的虚拟串行链接对使用DUN配置文件的应用程序是透明的。
Above the L2CAP layer, the remaining layers of the Bluetooth protocol stack aren't quite so linearly ordered.
在L2 CAP层之上，蓝牙协议栈中剩下的层没有很好的线性排列。
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