Motherboards and Buses - Upgrading and Repairing PCs - page 260

pinout of a standard dual USB motherboard header connector is shown in Figure 4.33 and
Table 4.40 .
Figure 4.33 Dual-USB header connector configuration.
Table 4.40 USB Header Connector Pinout
Many chassis include multiple inline connectors for the dual USB-to-front panel or rear
bracket connection, instead of a single keyed connector. An example of this is shown in
Figure 4.34 .
Figure 4.34 Front panel USB cable using multiple individual nonkeyed connectors.