GA BlueLine² DUPLEX+ /CI is a combination of a redundant DUPLEX system with an independent single system in a compact 19” rack, perfect for mounting in a swing frame. DUPLEX+ /CI supports up to three times six I/O cards (including CPU) for three BASIC /C units as well as three FSx switch cards. Logically the three units are configured as one DUPLEX /CI plus one BASIC /C architecture.