1f28:0020 — CDMA USB Modem A600

Cal-Comp

Vendor ID: 1f28
Product ID: 0020
Combined: 1f28:0020
Decimal: 7976:32

What is this device?

This is the USB identifier for a CDMA USB Modem A600 manufactured by Cal-Comp. The vendor ID 1f28 is registered to Cal-Comp with the USB Implementers Forum, and 0020 is the product ID that Cal-Comp assigned to this particular model. When you run lsusb on Linux, this device appears as 1f28:0020 Cal-Comp CDMA USB Modem A600.

How to identify it on your system

Linux

$ lsusb
Bus 001 Device 004: ID 1f28:0020 Cal-Comp CDMA USB Modem A600

You can filter directly with lsusb -d 1f28:0020, or get the full descriptor dump with lsusb -v -d 1f28:0020. Kernel messages from dmesg show the same pair as idVendor=1f28, idProduct=0020.

Windows

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

USB\VID_1F28&PID_0020
USB\VID_1F28&PID_0020&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_1F28&PID_0020"

macOS

$ system_profiler SPUSBDataType
    CDMA USB Modem A600:
      Product ID: 0x0020
      Vendor ID: 0x1f28  (Cal-Comp)

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:

1f28  Cal-Comp
	0020  CDMA USB Modem A600