Looks like the CS 11 has dropped the AC port and sag control from the 12, and it has an output to power an XP 5 or XP 8. The XP 5 and 8 drop the IEC power plugs, and have outputs to daisy chain to more XP 5/8 units. The XP 5 has SKUs for with and without a power supply, the XP 8 is only sold with a power supply.