Multi-Tech Systems Troubleshooting USB Issues in Windows 95/98: Installing usbsupp.exe and Resolving uhcd.sys Errors
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MultiModemUSB User Guide

Windows 95/98 Troubleshooting

If after installing the Microsoft USB supplement (usbsupp.exe), Windows Plug-and-Play does not auto-detect the modem, perform the following steps:

1.Open the System icon from the control panel and select the Device Manager Tab.

2.Double-click the Universal Serial Bus Controller icon.

3.Make sure that both the ROOT HUB and HOST Controller are listed. If only the HOST Controller is listed, remove it and reboot.

4.Open the System Properties dialog box from the control panel and select the Device Manager Tab. Check for a device labeled ? UNKNOWN. Double click UNKNOWN and check for a HOST Controller or ROOT HUB. If listed, remove them and reboot. If, after rebooting, the Add Hardware Wizard finds the USB devices and requires new drivers, such as uhcd.sys, the drivers can be found in the /windows/system directory.

Determining Why USB Support Is Not Present

This section is for Windows 95 users only. The DETAILS button in USBREADY can help you determine what is preventing USB support.

1.Click the DETAILS button. If the USB Class Host Controller window reads, “No USB Host Controller Found” then the necessary hardware, a USB Host Controller, has not been detected. If your PC does not have USB connectors, then this system will not support USB regardless of the Windows version.

2.You will need to purchase a PCI USB controller card.

3.If your PC does have USB connectors, verify that the USB hardware is enabled in your system BIOS configuration.

4.If the USB Class Host Controller window displays any other message, such as “Standard,” “Intel,” “Universal,” or “Open” Host Controller, then hardware support is present, but an incompatible version of Windows is currently installed.

5.If the Test Results Details dialog shows Windows 95 version 4.0.1111, which is Windows 95 OSR.2, proceed to “Installing Microsoft USB Support”. You will need to upgrade to OSR 2.1 by installing the USB supplement before installing the modem.

Installing Microsoft USB Support

This section is for Windows 95 users only. Microsoft provides a supplemental program (usbsupp.exe) to allow users to upgrade Windows 95 version OSR2 to support the Universal Serial Bus. To install:

1.Insert your Windows 95 CD into your CD ROM drive.

2.In the START menu, select RUN.

3.Type <CD drive letter>:\other\usb\usbsupp.

4.Follow the instructions on the screen.

5.After rebooting, go back to step 1 in “Verifying That Your System Supports USB” in Chapter 2 of this manual.

6.Ensure that the Test Results Details (from the Details button in the USB System Checker dialog) displays Windows 95 version 4.1212 or higher.

Note: Windows 95 version 4.0.950 or 4.0.950a does not support the upgrade path to USB. Microsoft does not provide an upgrade path to OSR2 from earlier versions of Windows. OSR2 must be preinstalled by your PC vendor. Contact your PC vendor for more information.

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Contents MultiModemUSB Model MT4X56USB User GuideUser Guide Record of RevisionsPatents TrademarksContents Glossary of Terms Index Introduction and Description Introduction FeaturesMultiModemUSB User Guide Technical Specifications InstallationPreview of this Guide Introduction and DescriptionRelated Documentation Front Panel Modem Ports Ports 1, 2, 3,Hub SystemRJ-ll Modem Connector USB Type a Upstream ConnectorUSB Type B Downstream Connector Power ConnectorInstallation Safety Warning Telecom UnpackingInstallation Cabling your MT4X56USBMT4X56USB Software Loading and Configuration Loading your Driver Software System USB SupportMT4X56USB Drivers for Windows Software Loading and Configuration Uninstalling MultiModemUSB in Windows MT4X56USB Drivers for Windows Uninstalling MultiModemUSB in Windows MultiModemUSB Drivers Install dialog box displays Click Next MT4X56USB Drivers for Windows NTSelect Add/Remove Programs Uninstalling MultiModemUSB in Windows NTAdd/Remove MT4X56USB Drivers for Windows Click Finish Software Loading and Configuration Select Add/Remove Hardware Installing Your V.90 Modems Click Start Settings Control Panel ModemsRead Carefully Software Loading and Configuration MT4X56USB Installing Your V.90 Modems Windows Click Start Settings Control Panel Phone and Modems optionMT4X56USB Software Loading and Configuration Windows 95/98 Configuration Utility MT4X56USB Windows NT 4.0/2000 Configuration Utility MT4X56USB MT4X56USB AT Commands, S-Registers and Result Codes AT Command Summary Command Enter KeyRepeat Last Command AnswerAT Commands, S-Registers and Result Codes Return Online to Data Mode Result Codes Enable/DisableInformation Request Modulation HandshakeModem Reset Load Factory SettingsTone Dialing Result Code FormatCommunications Mode Asynchronous Communications ModeTest Commands Display Current SettingsStore Current Configuration Select Stored Configuration for Hard ResetCommand &Zy=x Store Dialing Command \An Select Maximum MNP Block Size\Nn Error Correction Mode Selection \Tn Inactivity Timer\Kn Break Control \Qn Flow Control SelectionCommand %DCn AT Command Control Command %En Fallback and Fall Forward ControlEnter Setup Password Command #S=x Store Setup PasswordCommand +++ATCR Escape Sequence Command %%%ATCRRemote Configuration Escape SequenceRegister Unit Range Default Description RegistersS38 Upstream data ratesResult Codes Terse Verbose DescriptionFor more information on scripting, click the Help button Remote Configuration Setup Remote Configuration ProcedureChanging the Setup Password Remote Configuration and Management Remote Configuration CommandsChanging the Remote Escape Character MT4X56USB Troubleshooting Modem Does Not Respond to Commands None of the Indicators LightModem Dials But Cannot Connect Troubleshooting Modem Disconnects While OnlineModem Cannot Connect When Answering Loopback TestsModem Doesn’t Work with Caller ID Fax and Data Software Can’t Run at the Same TimeTest procedure Local Analog Loopback Test V.54 LoopRemote Digital Loopback Test V.54 Loop Remote digital loopback testLocal Digital Loopback Test V.54 Loop Local digital loopback testWindows 95/98 Troubleshooting Determining Why USB Support Is Not PresentInstalling Microsoft USB Support Double-click the Universal Serial Bus Controller iconUpgrade Procedure Upgrade Overview Identify the MT4X56USB FirmwareIdentify the Current Firmware Version Multi-Tech Web SiteDownload the Upgrade File Extract the Upgrade FilesUpgrade Procedure Clear Your Stored ParamentersUpgrade the Modem’s Firmware Restore Your ParametersService, Warranty and Tech Support Software User License Agreement Limited Warranty On-line Warranty RegistrationService, Warranty and Tech Support Tech SupportService Contacting Tech Support via E-mailAppendices Appendix a Regulatory Information Class B StatementFCC Part Industry CanadaFCC Part 68 Telecom AppendicesFAX Branding Statement Canadian Limitations NoticeEMC, Safety and Terminal Directive Compliance Commission Decision CTR21New Zealand Telecom Warning Notice International Modem RestrictionsAppendix B V.90 Support TroubleshootingIntroduction Glossary of Terms MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Glossary MT4X56USB Index IndexConfiguration MT4X56USB Software user license agreement Speed
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