Asalam

[abdulsalamsadik]

I have 2504 wireless controller with  9 pcs 17021-E-K9, i need to add another 6 outdoor AP's which model will be compatible with the available one and insure data streaming

[Scott Fella]

Well it also depends on the code you are running. Fist make sure you reference this:

http://www.cisco.com/c/en/us/td/docs/wireless/compatibility/matrix/compatibility-matrix.html

I would say look at the IW3702 or if you will need mesh, then the 1550 or 1570.  You can reference the data sheets for more info also.

-Scott

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