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Installing and Replacing Desktop Board Components 
55 
Connecting to the USB 2.0 Headers  
Before connecting to the USB 2.0 headers, observe the precautions in "Before You 
Begin" on page 31.  
See Figure 23, G on page 51 for the location of the three USB 2.0 
headers.  Table 11 shows the pin assignments for each USB 2.0 header.  Each USB 
header can be used to connect two USB devices. 
Table 11. USB 2.0 Header Signal Names  
USB Port A 
USB Port B 
Pin 
Signal Name 
Pin 
Signal Name 
Power (+5 V) 
Power (+5 V) 
3 D- 
4 D- 
5 D+ 
6 D+ 
7 Ground 
8 Ground 
9 Key 
10 
No 
Connection 
Note:  USB ports may be assigned as needed. 
 
 
NOTE 
Computer systems that have an unshielded cable attached to a USB port might not 
meet FCC Class B requirements, even if no device or a low-speed USB device is 
attached to the cable.  Use a shielded cable that meets the requirements for a 
full-speed USB device. 
Connecting to the Audio System 
After installing the RealTek audio driver from the Intel Express Installer DVD-ROM, the 
multi-channel audio feature can be enabled.  Figure 24 shows the back panel audio 
connectors.  The default connector assignments are shown in the table.   
 
Item Description 
A Audio 
line 
in 
Audio line out 
C Mic 
in 
Figure 24.  Back Panel Audio Connectors