Usb Connector; Usb Cable Data - HP Compaq D315 Technical Reference Manual

5.7.3 USB CONNECTOR

These systems provide type-A USB ports as shown in Figure 5-9 below.
Figure 5-9. Universal Serial Bus Connector
Table 5–19. 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 5–20. 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 5-19.
USB Connector Pinout
Description
+5 VDC
Data (minus)
Table 5-20.
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
Second Edition - April 2003
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)
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Technical Reference Guide
Description
Data (plus)
Ground
5-25