All Aruba Networks APs require a controller unless they are part of the new Aruba Instant AP family (IAP-92, IAP-93, IAP-105) in which case the first AP acts as a virtual controller
Kyle Holladay / IPOfficeHelp.com
ACSS & APSS Avaya SME Communications
APDS Avaya Data
MCP/MCTS Exchange 2007/2010
Adtran ATSA, Aruba ACMA
"Thinking is the hardest work there is, which is the probable reason why so few engage in it." - Henry Ford