HP Compaq dc7100 CMT User Manual

Technical Reference Guide 361834-001 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

HP Compaq dc7100 CMT Specifications

General

Memory	Up to 4 GB DDR2 SDRAM
Operating System	Windows XP Professional
Processor	Intel Pentium 4
Chipset	Intel 915G Express
Storage	40GB to 160GB SATA HDD
Graphics	Integrated Intel Graphics Media Accelerator 900
Optical Drive	DVD-ROM, CD-RW, DVD+/-RW
Network	Integrated Gigabit Ethernet
Form Factor	Convertible Minitower
Expansion Slots	1 PCI Express x16, 3 PCI
Ports	USB 2.0, serial, parallel, PS/2, audio in/out

Summary

2 System Overview

2.4 System Architecture

Details the system architecture based on Intel Pentium 4 processor and 915G chipset.

2.5 Specifications

Provides environmental, electrical, and physical specifications for the systems.

3 Processor/Memory Subsystem

3.2 Pentium 4 Processor

Details the Intel Pentium 4 processor features and architecture.

3.3 Memory Subsystem

Describes the DDR memory architecture and DIMM configurations.

4 System Support

4.2 PCI Bus Overview

4.5 System Management

Covers security, power management, temperature, and overall system status.

5 Input/Output Interfaces

5.2 PATA/SATA Interfaces

5.6 Keyboard/Pointing Device Interface

5.7 Universal Serial Bus Interface

Describes the USB interface, ports, and data formats.

5.9 Network Interface Controller

6 Integrated Graphics Subsystem

6.2 Functional Description

Describes the Intel integrated graphics controller (IGC) functions.

6.4 Upgrading Graphics

7 Power and Signal Distribution

7.2 Power Supply Assembly/Control

Details on the power supply assembly and its control mechanisms.

7.3 Power Distribution

8 BIOS ROM

8.3 Boot Functions

Covers functions related to the boot process, including boot device order.

8.4 Setup Utility

Describes how to configure system functions using the Setup utility.

8.5 Client Management Functions

A Error Messages and Codes

A.3 Power-On Self Test (POST) Messages

Lists POST messages and their probable causes.

A.5 Memory Error Messages (2xx-xx)