蓝牙协议栈是一组分层程序，其下方为基带，包括无线电硬件及直接控制无线电的软件；上方为蓝牙配置文件。配置文件规定了使用协议栈的具体方式，针对不同设备类型和用途有不同的配置文件，例如手机通常实现耳机配置文件，而传真机则可能实现传真配置文件。配置文件可以视为对通用协议使用的特定约束，有助于确保采用相同配置文件的不同设备间的互操作性。
A: A Bluetooth protocol stack is a set of layered programs. Each layer in a protocol stack talks to the layer above it and the layer below it. Below a Bluetooth protocol stack is the baseband, which consists of radio hardware and the software that directly controls the radio; above it are Bluetooth profiles. A profile is a set of instructions for using the protocol stack in a certain way. There are different profiles for different types of devices and different purposes. For example, a cell phone might implement the Headset Profile, while a fax machine might implement the Fax Profile. Profiles can be thought of as purpose-specific constraints put on the use of the underlying multi-purpose protocols, where such constraints help to ensure interoperability between devices using the same profile.
From: http://www.oi-us.com/service/faq_pre_stack_details.htm
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