@ElvisV 

The SSID is just a name, there is no limit on the SSID provided you have the appropriate number of APs to service the clients.   

In answer to your question, the user capacity is 15k users for the OC300.   It doesnt matter if that is spread over 1, 2 or 10 SSIDs, its ultimately just a naming convention.

  @Philbert 

Thanks in advance, i have 2 SSID configures in OC-300 with Mac-Filtering, when i try to create a Mac Group with more of 500 device, the message is The mac address up to the limit, I read that the limit is 500 Mac for group, is there any possibility to create a group with more of 500 Mac Address?, Can I apply an update for the controller? that allows correcting this requirement.

Many thanks

  @ElvisV 

Hey

Sadly no the limit on MAC address filtering is 500 enteries.   Is there a reason you are using MAC filtering and not standard PSK or even PPSK?  Are you running an open network