HP 8100 Technical Reference Guide: HP Compaq 8100 Elite Series Business Deskto - Page 60

USB Connector, 6.2 USB Cable Data, Table 5-6., USB Connector Pinout, USB Cable Length Data

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Input/Output Interfaces 5.6.1 USB Connector These systems provide type-A USB ports as shown in Figure 5-7. 1 2 3 4 Figure 5-7. Universal Serial Bus Connector (as viewed from rear of chassis) Table 5-6. USB Connector Pinout Pin Signal Description Pin Signal Description 1 Vcc +5 VDC 3 USB+ Data (plus) 2 USB- Data (minus) 4 GND Ground 5.6.2 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 5-7. 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. Table 5-8. USB Color Code Signal Insulation color Signal Insulation Color Data + Green Vcc Red Data - White Ground Black 5-10 www.hp.com Technical Reference Guide

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5-10
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Technical Reference Guide
Input/Output Interfaces
5.6.1 USB Connector
These systems provide type-A USB ports as shown in Figure 5-7.
Figure 5-7.
Universal Serial Bus Connector (as viewed from rear of chassis)
5.6.2 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).
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.
Table 5-6.
USB Connector Pinout
Pin
Signal
Description
Pin
Signal
Description
1
Vcc
+5 VDC
3
USB+
Data (plus)
2
USB-
Data (minus)
4
GND
Ground
1
2
3
4
Table 5-7.
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)
Table 5-8.
USB Color Code
Signal
Insulation color
Signal
Insulation Color
Data +
Green
Vcc
Red
Data -
White
Ground
Black