藍牙4部分模塊：最后準備好黃金時間

　　在批準了任何新標準或對現有的協作規范進行重大更改之后，該行業需要時間來適應。如果該標準得到廣泛認可并在市場中根深蒂固，情況尤其如此。在無線消費品和工業產品中，沒有比藍牙更根深蒂固的東西了。自1998推出以來，藍牙技術已成為世界上最具影響力的技術之一，成為便攜式設備中無線通信的標準。

　　然而，雖然傳統的藍牙協議已經證明是有用的，并且在諸如中等數據速率的流音頻等任務中占據了個人區域網絡（PAN）空間，最新的迭代，藍牙4，完全改變了游戲。這是通過包括“經典藍牙”與“藍牙高速”，跳躍的Wi-Fi來實現更高的利率，和“藍牙低能量（LE）”，這使得它能夠在一個范圍內的高達160英尺（50米）是吝嗇的。

　　Bluetooth Low Energy technology operates in the same spectrum range （the 2.400 GHz-2.4835 GHz ISM band） as Classic Bluetooth technology， but uses a different set of channels. Instead of Bluetooth’s traditional seventy-nine 1 MHz-wide channels， LE has forty 2 MHz-wide channels. The bit rate is 1 Mbit/s， and the maximum transmit power is 10 mW.

　　While the Bluetooth 4.0 specification has been out for several years， it has taken that long for parts， stacks， and modules to arrive from competitive sources. Beyond that， and as is often the case with new standards， early offerings were fraught with misinterpretations of the specification （even from companies represented on the standards committee）。 First-pass silicon was early on the learning curve， and even companies with a lot of RF expertise found several passes were needed to get it right.