Hp DC5850 Uživatelský manuál stáhnout pdf (Strana 62)

5-12 www.hp.com Technical Reference Guide

Input/Output Interfaces

5.7.2 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 5-8.

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 5-9.

USB Color Code

Signal Insulation color

Data + Green

Data - White

Vcc Red

Ground Black

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 113 114

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Hp DC5850 Uživatelský manuál Strana 62