Asus P4B-LS Motherboard DIY Troubleshooting Guide - Page 51
SMBus Connector, optional, Internal Audio Connectors
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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. ® P4B-LS SMB 1 FLOATING SMBCLK Ground SMBDATA +3V P4B-LS SMBus Connector Figure 2-38 SMBus Connector 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. CD1 (Black) AUX (White) ® P4B-LS MODEM Modem-Out Ground Ground Modem-In Right Audio Channel Ground Ground Left Audio Channel P4B-LS Internal Audio Connectors Figure 2-39 Internal Audio Connectors ASUS P4B-LS motherboard user guide 2-29