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).
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.
Signal
Data +
Data -
Vcc
Ground
5-26
Table 5-21.
USB Cable Length Data
Resistance
0.036 Ω
0.057 Ω
0.091 Ω
0.145 Ω
0.232 Ω
Color code
Insulation color
Green
White
Red
Black
www.hp.com
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)
Technical Reference Guide