Technical Reference Guide
Compaq Deskpro EXS and Workstation 300 Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition - December 2000
5-25
5.7.3 USB
CONNECTOR
Four series-A connectors are accessible on the rear panel of the chassis.
Figure 5-8.
Universal Serial Bus Connector
Table 5–19. USB Connector Pinout
Table 5-19.
USB Connector Pinout
Pin
Signal
Description
Pin
Signal
Description
1
Vcc
+5 VDC
3
USB+
Data (plus)
2
USB-
Data (minus)
4
GND
Ground
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
Table 5-20.
USB Cable Length Data
Conductor Size
Resistance
Maximum Length
20 AWG
0.036
Ω
16.4 ft (5.00 m)
22 AWG
0.057
Ω
9.94 ft (3.03 m)
24 AWG
0.091
Ω
6.82 ft (2.08 m)
26 AWG
0.145
Ω
4.30 ft (1.31 m)
28 AWG
0.232
Ω
2.66 ft (0.81 m)
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:
Signal
Insulation color
Data +
Green
Data -
White
Vcc
Red
Ground
Black
1
2
3
4
Содержание Deskpro EXS
Страница 2: ......
Страница 4: ......
Страница 6: ......
Страница 252: ...This page is intentionally blank...