ASRock A75 Extreme6 manual 34

USB 2.0 Headers							Besides two default USB 2.0
(9-pin USB6_7)							ports on the I/O panel, there
(see p.12 No. 31)							are three USB 2.0 headers on
							this motherboard. Each USB 2.0
							header can support two USB
							2.0 ports.
(9-pin USB8_9)		USB_PWR
			P-9
(see p.12 No. 21)				P+9
					GND
	1					DUMMY
					GND
				P+8
			P-8
		USB_PWR
(9-pin USB10_11)		USB_PWR
			P-11
(see p.12 No. 30)				P+11
					GND
	1					DUMMY
					GND
				P+10
			P-10
		USB_PWR
USB 3.0 Header							Besides four default USB 3.0
(19-pin USB3_2_3)							ports on the I/O panel, there is
(see p.12 No. 10)							one USB 3.0 header on this
							motherboard. This USB 3.0
							header can support two USB
							3.0 ports.

Infrared Module Header	+5VSB
	IRTX
(5-pin IR1)	DUMMY
(see p.12 No. 29)	1
	GND
	IRRX

This header supports an optional wireless transmitting and receiving infrared module.

Consumer Infrared Module Header	This header can be used to
(4-pin CIR1)	connect the remote
(see p.12 No. 32)	controller receiver.

Front Panel Audio Header			PRESENCE#
		GND
(9-pin HD_AUDIO1)				MIC_RET
						OUT_RET
(see p.12 No. 35)	1
						OUT2_L
					J_SENSE
				OUT2_R
			MIC2_R
		MIC2_L

This is an interface for the front panel audio cable that allows convenient connection and control of audio devices.

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