Compaq DC7600 HP Compaq dx 7200 and dc7600 Personal Computers, Technical Refer - Page 109

USB Cable Data, Table 5-23., 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 5-23. 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 Technical Reference Guide www.hp.com 5-29

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Technical Reference Guide
www.hp.com
5-29
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 5-23.
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