BCM RX67Q - COM Port Ring-In; +12 V; +5 V Power Select: JCOMPWR1, JCOMPWR2, JCOMPWR3, JCOMPWR4; ATX;AT Mode Selection: PSON1

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1.11.2 COM Port Ring-in/ +12V/ +5V Power Select:
JCOMPWR1, JCOMPWR2, JCOMPWR3, JCOMPWR4
These headers provide ring-in, or 5V, or 12V on the com ports.
1.11.3 ATX/AT Mode Selection: PSON1
This header provides the option to boot the system in the form of ATX mode (default) or AT mode.
When the system is set in AT mode, the system power on/off will be controlled directly by the power switch
on power supply. And some of the power saving modes will not function as ATX mode provided.