The 3Com 3C920B EMB WNM Integrated Fast Ethernet Controller provides a wired network connection through a compatible computer’s built-in Ethernet port. Its driver allows Windows to recognize the controller and manage communication with your local network, router, or other connected equipment.

Key Features

• Wired Ethernet connectivity: Enables the controller’s 10/100 Mbps Ethernet functions for everyday network access, file transfers, and internet use.
• Windows hardware recognition: Helps the operating system identify the integrated 3Com adapter correctly rather than leaving it listed as an unknown Ethernet controller.
• Network configuration access: Makes supported adapter settings available through Windows networking tools and Device Manager.
• Driver recovery: A matching driver can restore adapter functionality after an operating system reinstall or resolve problems caused by a missing or incorrect driver.

How to Install

1. Identify your adapter and Windows version. Open Device Manager and check under Network adapters or Other devices. Confirm that the hardware is the 3Com 3C920B EMB WNM Integrated Fast Ethernet Controller, then check whether your Windows installation is 32-bit or 64-bit.

1. Verify package compatibility before downloading. For Windows 11, 10, 8, or 7, check the driver package’s stated operating system support and hardware IDs. This is a legacy controller, so a compatible driver may not be available for every Windows version, particularly newer releases.

1. Download and extract the matching package. If the affected computer cannot access the internet, use another device and transfer the files with a USB drive. Extract compressed files before starting installation.

1. Install the driver. Run the included installer if available. Alternatively, right-click the controller in Device Manager, select Update driver, choose Browse my computer for drivers, and point Windows to the extracted folder.

1. Restart and test the connection. Reboot if prompted, connect an Ethernet cable, and confirm that the adapter appears without a warning icon. If installation fails or connectivity worsens, use Roll Back Driver when available and recheck the package’s compatibility rather than forcing an unsupported driver.

Common Issues and Fixes

• Install fails or reports “no compatible driver”: Older 3Com packages may not match the integrated EMB OEM ID. Extract the download, run setup as administrator, or use Device Manager > Update driver > Browse > Let me pick > Have Disk and point to the INF. Match 32-bit/64-bit Windows.
• Device not detected: Enable the onboard LAN in BIOS, check Device Manager for a disabled or hidden adapter, and rescan hardware. If it remains missing, use