Asus p4b266 8.SMBus connector (6-1pin SMB), ASUS P4B266 motherboard user guide, 9.Internal audio connectors (4-pinCD1, AUX, MODEM) (optional)

8.SMBus connector (6-1 pin SMB)

This connector allows you to connect SMBus (System Management Bus) devices. Devices communicate with an SMBus host and/or other SMBus devices using the SMBus interface. SMBus is a specific implementation of an I2C bus, a multi-device bus that allows multiple chips to connect to the same bus and enable each one to act as a master by initiating data transfer.

P4B266

P4B266 SMBus Connector

SMB

1
FLOATING SMBCLK	Ground SMBDATA +3V

9.Internal audio connectors (4-pin CD1, AUX, MODEM) (optional)

These connectors allow you to receive stereo audio input from sound sources such as a CD-ROM, TV tuner, or MPEG card. The MODEM connector allows the onboard audio to interface with a voice modem card with a similar connector. It also allows the sharing of mono_in (such as a phone) and a mono_out (such as a speaker) between the audio and a voice modem card.

AUX (White)	Left Audio Channel
	Ground
	Ground
	Right Audio Channel
CD(Black)	Right Audio Channel
	Ground
	Ground
	Left Audio Channel
MODEM
P4B266	Modem-Out
	Ground
	Ground
	Modem-In

P4B266 Internal Audio Connectors

ASUS P4B266 motherboard user guide 2-31