Part B: Core & I/O Frame

Core 250i – A total of 64 flexible channels with 32 channels of integrated I/O (eight card slots) onboard.
Core 500i – A total of 128 flexible channels with 32 channels of integrated I/O (eight card slots) onboard.
Core 1000 – A total of 128 channels with 4 channels of integrated I/O (one card slot) onboard.
Core 3000 – A total of 256 channels with 4 channels of integrated I/O (one card slot) onboard.
Core 4000 – A total of 512 channels (or 1024 depending on network architecture) with 4 channels of integrated I/O (one card slot) onboard.