Installing and Replacing Desktop Board Components
45
Front Panel HD Audio Header
Figure 20, D shows the location of the front panel audio header. Table 8 shows the pin
assignments for the front panel audio header.
Table 8. Front Panel Audio Header Signal Names
Pin Signal Name Pin Signal Name
1 PORT 1L 2 GND
3 PORT 1R 4 PRESENCE#
5 PORT 2R 6 SENSE1_RETURN
7 SENSE_SEND 8 KEY (no pin)
9 PORT 2L 10 SENSE2_RETURN
To install the cable that connects your front panel audio solution to the front panel
audio header, follow these steps:
1. Observe the precautions in "Before You Begin" on page 25.
2. Turn off all peripheral devices connected to the computer.
Turn off the computer
and disconnect the AC power cord.
3. Remove the cover.
4. Install a correctly keyed and shielded front panel audio cable.
USB 2.0 Headers
See Figure 20, E for the location of the three USB 2.0 headers. Table 9 shows the pin
assignments for each USB 2.0 header. Each USB header can be used to connect two
USB devices.
Table 9. 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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