05dd:ff91 — 2Wire PC Port Phoneline 10Mbps Adapter

This is the USB identifier for a 2Wire PC Port Phoneline 10Mbps Adapter manufactured by Delta Electronics, Inc.. The vendor ID 05dd is registered to Delta Electronics, Inc. with the USB Implementers Forum, and ff91 is the product ID that Delta Electronics, Inc. assigned to this particular model. When you run lsusb on Linux, this device appears as 05dd:ff91 Delta Electronics, Inc. 2Wire PC Port Phoneline 10Mbps Adapter.

Linux

$ lsusb
Bus 001 Device 004: ID 05dd:ff91 Delta Electronics, Inc. 2Wire PC Port Phoneline 10Mbps Adapter

You can filter directly with lsusb -d 05dd:ff91, or get the full descriptor dump with lsusb -v -d 05dd:ff91. Kernel messages from dmesg show the same pair as idVendor=05dd, idProduct=ff91.

Windows

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

USB\VID_05DD&PID_FF91
USB\VID_05DD&PID_FF91&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_05DD&PID_FF91"

macOS

$ system_profiler SPUSBDataType
    2Wire PC Port Phoneline 10Mbps Adapter:
      Product ID: 0xff91
      Vendor ID: 0x05dd  (Delta Electronics, Inc.)

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:

05dd  Delta Electronics, Inc.
	ff91  2Wire PC Port Phoneline 10Mbps Adapter

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• 05dd:ff32 FriendlyNET AeroLAN AL2011
• 05dd:ff35 PCW 100 - Wireless 802.11b Adapter

See all 6 devices from Delta Electronics, Inc. →