Universal Serial Bus K. Jonas Svensson Support Professional CSO Platforms Microsoft Corporation

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Universal Serial BusK. Jonas SvenssonSupport
ProfessionalCSO PlatformsMicrosoft Corporation
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Introduction

• This presentation describes troubleshooting steps
  to help solve problems that may occur with USB
  devices in Windows Millennium Edition (Me).

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Overview

• What is USB?
• Benefits of using USB
• USB requirements/topology
• Windows Millennium Edition and USB
• Common USB issues
• Basic steps to resolve USB issues

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What is Universal Serial Bus?

• Industry standard extension to the PC
• Goals for USB include
• Ease of use for PC peripheral expansion
• Transfer rates up to 12 Mbps
• Support for real-time data for voice, audio, and
  compressed video
• Enable new classes of devices that augment the PC
  capabilities

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Benefits of USB

• Consistent with the PC Plug and Play architecture
• Simplified cabling
• Self-identifying devices
• Dynamically attachable and reconfigurable
  peripherals
• Support for up to 127 physical devices

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Benefits of USBContinued

• USB devices use no IRQs, I/O addresses, or DMA
  connections
• New classes of devices
• Audio Device Class
• Communications Device Class
• Monitor Control Class
• Mass Storage Device Class
• Image Device Class

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USB RequirementsGeneral Topology

• Three pieces to every USB system
• Host
• Hub
• Function (Device)

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USB RequirementsGeneral Topology
Cable Type A
Cable Type B
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Windows Me and USBWhats New?

• USB 1.1 compliant
• Increased support for scanners and cameras
• USB content security
• USB legacy mappers

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Windows Me and USBTroubleshooting Tools

• USB Bandwidth Tool
• USB Power Tool

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Common USB Issues

• Bandwidth issues
• Power issues
• Enumeration issues
• Driver issues
• Hardware configuration issues
• Secure content issues

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Resolving USB IssuesBandwidth Issues

• Support for 127 devices
• 1.5 Mbps or 12 Mbps usage per device
• System reserved bandwidth
• Bandwidth Usage Tool

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Resolving USB IssuesPower Issues

• Passive vs. active hub
• Host controller can supply 500 mA total
• Passive hub 100 mA per port
• Active hub 500 mA per port
• Power Usage Tool

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Common USB IssuesEnumeration Issues

• Slow enumeration
• No enumeration

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Common USB IssuesDriver Issues

• USB host controllers
• Legacy mapper products

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Resolving USB IssuesMalfunctioning or
Incorrectly Configured Hardware

• Mismatched cabling
• Out-of-date firmware or BIOS
• Incorrectly configured root hub

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Resolving USB IssuesSecure Content

• New to Windows Me
• Works with Digital Rights Management (DRM)
• Transfer vs. transcode

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Resolving USB IssuesIssues Specific to Windows Me

• Microsoft Knowledge Base
• Q266014 No Drive Letter Assigned to USB or IEEE
  1394 Storage Device
• Q265876 Eject Option for USB Floppy Disk Drives
  and LS-120 Drives May Not Work
• Q264338 USB Web Cameras May Cause Hibernate to
  Work Improperly

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Resolving USB IssuesIssues Specific to Windows Me

• Microsoft Knowledge Base
• Q269138 Error Message The Driver NT1003.SYS Is
  Not Compatible with Windows Me
• Q268146 Windows Millennium Edition Detects
  Floppy Disk Drive When One Is Not Present
• Q267491 MP3 Audio Skips When Copying Files with
  USB Devices

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Resolving USB IssuesIssues Specific to Windows Me

• Microsoft Knowledge Base
• Q261696 Out of Bandwidth Message with USB
  Audio Device
• Q256300 USB Input Devices Do Not Work in Safe
  Mode or Real Mode
• Q254901 USB Power Exceeded Error Message When
  Connecting USB Devices

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