04c1:00a9 — ISDN Pro TA-U
U.S. Robotics (3Com)
- Vendor ID
- 04c1
- Product ID
- 00a9
- Combined
- 04c1:00a9
- Decimal
- 1217:169
What is this device?
This is the USB identifier for a ISDN Pro TA-U manufactured by U.S. Robotics (3Com). The vendor ID 04c1 is registered to U.S. Robotics (3Com) with the USB Implementers Forum, and 00a9 is the product ID that U.S. Robotics (3Com) assigned to this particular model. When you run lsusb on Linux, this device appears as 04c1:00a9 U.S. Robotics (3Com) ISDN Pro TA-U.
How to identify it on your system
Linux
$ lsusb Bus 001 Device 004: ID 04c1:00a9 U.S. Robotics (3Com) ISDN Pro TA-U
You can filter directly with lsusb -d 04c1:00a9, or get the full descriptor dump with lsusb -v -d 04c1:00a9. Kernel messages from dmesg show the same pair as idVendor=04c1, idProduct=00a9.
Windows
In Device Manager, open the device, go to Details → Hardware Ids. This device reports:
USB\VID_04C1&PID_00A9 USB\VID_04C1&PID_00A9&REV_0100
From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_04C1&PID_00A9"
macOS
$ system_profiler SPUSBDataType
ISDN Pro TA-U:
Product ID: 0x00a9
Vendor ID: 0x04c1 (U.S. Robotics (3Com))Driver help
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.
Raw usb.ids entry
The exact lines this page is generated from, in the upstream source file:
04c1 U.S. Robotics (3Com) 00a9 ISDN Pro TA-U