Usb Connector; Usb Cable Data - HP Compaq d330 DT Technical Reference Manual

5.7.3 USB CONNECTOR

These systems provide type-A USB ports as shown in Figure 5-9 below.
Figure 5-10. Universal Serial Bus Connector
Table 5-22. USB Connector Pinout
Pin Signal
1 Vcc
2 USB-

5.7.4 USB CABLE DATA

The recommended cable length between the host and the USB device should be no longer than
sixteen feet for full-channel (12 MB/s) operation, depending on cable specification (see following
table).
Table 5-23. USB Cable Length Data
Conductor Size
20 AWG
22 AWG
24 AWG
26 AWG
28 AWG
NOTE:
For sub-channel (1.5 MB/s) operation and/or when using sub-standard cable
shorter lengths may be allowable and/or necessary.
The shield, chassis ground, and power ground should be tied together at the host end but left
unconnected at the device end to avoid ground loops.
Color code:
1 2
Table 5-22.
USB Connector Pinout
Description
+5 VDC
Data (minus)
Table 5-23.
USB Cable Length Data
Resistance
0.036 Ω
0.057 Ω
0.091 Ω
0.145 Ω
0.232 Ω
Signal Insulation color
Data + Green
Data - White
Vcc Red
Ground Black
hp compaq d330 and d530 Series of Personal Computers
First Edition – June 2003
Technical Reference Guide
3 4
Pin Signal
3 USB+
4 GND
Maximum Length
16.4 ft (5.00 m)
9.94 ft (3.03 m)
6.82 ft (2.08 m)
4.30 ft (1.31 m)
2.66 ft (0.81 m)
Featuring the Intel Pentium 4 Processor
Description
Data (plus)
Ground
5-27