04c1:00b9 — HomeConnect IDSL Modem

This is the USB identifier for a HomeConnect IDSL Modem manufactured by U.S. Robotics (3Com). The vendor ID 04c1 is registered to U.S. Robotics (3Com) with the USB Implementers Forum, and 00b9 is the product ID that U.S. Robotics (3Com) assigned to this particular model. When you run lsusb on Linux, this device appears as 04c1:00b9 U.S. Robotics (3Com) HomeConnect IDSL Modem.

Linux

$ lsusb
Bus 001 Device 004: ID 04c1:00b9 U.S. Robotics (3Com) HomeConnect IDSL Modem

You can filter directly with lsusb -d 04c1:00b9, or get the full descriptor dump with lsusb -v -d 04c1:00b9. Kernel messages from dmesg show the same pair as idVendor=04c1, idProduct=00b9.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_04C1&PID_00B9
USB\VID_04C1&PID_00B9&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_04C1&PID_00B9"

macOS

$ system_profiler SPUSBDataType
    HomeConnect IDSL Modem:
      Product ID: 0x00b9
      Vendor ID: 0x04c1  (U.S. Robotics (3Com))

Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.

The exact lines this page is generated from, in the upstream source file:

04c1  U.S. Robotics (3Com)
	00b9  HomeConnect IDSL Modem

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See all 10 devices from U.S. Robotics (3Com) →