8.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) CD (Black)

Left Audio Channel

Ground

Ground

Right Audio Channel

P4B-M

 

MODEM

Modem-Out

 

Ground

 

Ground

 

Modem-In

P4B-M Internal Audio Connectors

Figure 2-36 Internal Audio Connectors

9.Headphone true-level line out connector (3-pin HPHONE) (optional)

This connector connects to an optional front panel audio module using a 3-pin audio cable. If your chassis has this audio module, you can connect a headphone/speaker on the front panel.

P4B-M

P4B-M True-Level Line Out Connector

HPHONE

1

 

Headphone

GND Headphone

Left

Right

Figure 2-37 Headphone True-level Line Out Connector

ASUS P4B-M motherboard user guide

2-27