Installing and Replacing Desktop Board Components
49
Alternate Front Panel Power LED Header
Figure 21, G on page 45 shows the location of the alternate front panel power LED
header. Pins 1 and 3 of this header duplicate the signals on pins 2 and 4 of the front
panel header. If your chassis has a three-pin power LED cable, connect it to this
header.
Table 13 shows the pin assignments for the al
ternate front panel power LED header.
Table 13. Alternate Front Panel Power LED Header
Pin Description In/Out
1 Front panel green LED Out
2 No pin
3 Front panel yellow LED Out
USB 2.0 Headers
Before connecting to the USB 2.0 headers, observe the precautions in "Before You
Begin" on page 27. See Figure 21, H on page 45 for the location of the three USB 2.0
headers. Table 14 shows the pin assignments for each USB 2.0
header. Each USB
header can be used to connect two USB devices.
Table 14. 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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