Asus P4B Figure 2-38SMBus Connector, 8.SMBus connector (6-1pin SMB), ASUS P4B motherboard user guide, Figure 2-39Internal Audio Connectors

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 an2CI 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.

P4B

P4B SMBus Connector

SMB

1
FLOATING SMBCLK	Ground SMBDATA +3V

Figure 2-38 SMBus Connector9.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.

P4B

P4B Internal Audio Connectors

CD1 (Black) AUX (White)

MODEM

Modem-In

Ground

Ground

Modem-Out

Channel	Ground	Ground Channel
Right Audio		Left Audio

Figure 2-39 Internal Audio Connectors

ASUS P4B motherboard user guide 2-29