Compaq 8000 Technical Reference Guide: HP Compaq 8000 Elite Series Business De - Page 60

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

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Input/Output Interfaces 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 Data + Green Data - White Vcc Red Ground Black 5-10 www.hp.com Technical Reference Guide

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www.hp.com
Technical Reference Guide
Input/Output Interfaces
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
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
Data +
Green
Data -
White
Vcc
Red
Ground
Black