這一note主要解釋Regulatory Domain是什麼。以較新的思科AP的型號舉例，思科AP的PID一般都是按照如下的命名：

AIR-AP3802I-H-K9C

按照自己的理解：

AIR：其中的相關資訊都比較好理解，Aironet無線產品一般都是AIR開頭的，例如無線AP都是AIR-... ，無線WLC也是AIR-....

AP：AP自然不用多說，代表AP（Access Point）；

3802：代表AP的具體型號和系列，例如同系列的還有1810,1832,1852,2802,4800(4800是目前最新的AP）

H：代表的就是Regulatory Domain，這個和國家有關，因為不同的國家，允許的無線頻段不一樣，例如我們國家，-H就代表China，當然-C也可以在中國使用，因為-C的無線頻段也符合國家的允許。其實這個-H引數根本上代表的就是無線通道使用的頻段。

C (C regulatory domain):

●  2.412 to 2.472 GHz; 13 channels ●   5.745 to 5.825 GHz; 5 channels  

H (H regulatory domain):

●  2.412 to 2.472 GHz; 13 channels ●  5.150 to 5.320 GHz; 8 channels ●   5.745 to 5.825 GHz; 5 channels   其他監管域允許不同通道允許的頻段：

A (A regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.700 GHz; 8 channels
(excludes 5.600 to 5.640 GHz) ●   5.745 to 5.825 GHz; 5 channels

B (B regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.720 GHz; 12 channels ●   5.745 to 5.825 GHz; 5 channels

C (C regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.745 to 5.825 GHz; 5 channels

D (D regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.745 to 5.825 GHz; 5 channels

E (E regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.700 GHz; 8 channels
(excludes 5.600 to 5.640 GHz)

F (F regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.745 to 5.805 GHz; 4 channels

G (G regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.745 to 5.825 GHz; 5 channels

H (H regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.150 to 5.320 GHz; 8 channels ●   5.745 to 5.825 GHz; 5 channels

I (I regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels

K (K regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.620 GHz; 7 channels ●   5.745 to 5.805 GHz; 4 channels

N (N regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.745 to 5.825 GHz; 5 channels

Q (Q regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.700 GHz; 11 channels

R (R regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.660 to 5.700 GHz; 3 channels ●   5.745 to 5.805 GHZ; 4 channels

S (S regulatory domain):

●   2.412 to 2.472 GHz; 13 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.700 GHz;, 11 channels ●   5.745 to 5.825 GHz; 5 channels

T (T regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.280 to 5.320 GHz; 3 channels ●   5.500 to 5.700 GHz; 8 channels
(excludes 5.600 to 5.640 GHz) ●   5.745 to 5.825 GHz; 5 channels

Z (Z regulatory domain):

●   2.412 to 2.462 GHz; 11 channels ●   5.180 to 5.320 GHz; 8 channels ●   5.500 to 5.700 GHz; 8 channels
(excludes 5.600 to 5.640 GHz) ●   5.745 to 5.825 GHz; 5 channels

K9：代表加密，這個和路由器中的K9應該差不多，K9 Product bundels have strong AES/3DES encryption.

C：代表Configurable，對於該型別號的AP，帶C代表出廠時ME（Mobility Express）映象的，如果不帶C，出廠的映象應該是LAP的映象。