HP Dc7700 HP Compaq dx7300 and dc7700 Business PC Technical Reference Guide, 1 - Page 104

USB Cable Data, Table 5-21., USB Cable Length Data

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Input/Output Interfaces 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 5-21. 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 5-26 www.hp.com Technical Reference Guide

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5-26
www.hp.com
Technical Reference Guide
Input/Output Interfaces
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).
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 5-21.
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)
Color code
Signal
Insulation color
Data +
Green
Data -
White
Vcc
Red
Ground
Black