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5.7.3 USB CONNECTOR
The USB interface provides two series-A connectors on the rear panel.
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
0.057
0.091
0.145
0.232
Signal
Insulation color
Data +
Green
Data -
White
Vcc
Red
Ground
Black
Compaq Deskpro EX Series of Personal Computers
First Edition - August 2000
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)
Description
Data (plus)
Ground
5-23
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