Installing and Replacing Desktop Board Components
51
Front Panel Header
See Figure 22, G for the location of the front panel header. Table 12 shows the pin
assignments for the front panel header.
Table 12. Front Panel Header Signal Names
Pin Signal Name In/Out
Pin Signal Name In/Out
Hard Drive Activity LED Power LED
1 Hard disk LED pull-up to +5 V
Out 2 Front panel green LED Out
3 Hard disk active LED Out 4 Front panel yellow LED Out
Reset Switch On/Off Switch
5 Ground 6 Power switch In
7 Reset switch In 8 Ground
Power Not Connected
9 Power Out 10 No pin
USB 2.0 Headers
See Figure 22, H for the location of the three USB 2.0 headers. Table 13 shows the
pin assignments for each USB 2.0 header. Each USB header can be used to connect
two USB devices.
Table 13. USB 2.0 Header Signal Names
USB Port A USB Port B
Pin Signal Name Pin Signal Name
1 Power (+5 V) 2 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.
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