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CDCE(4)                      Device Drivers Manual                     CDCE(4)

NAME
     cdce - USB Communication Device Class Ethernet driver

SYNOPSIS
     cdce*  at uhub? port ?

DESCRIPTION
     The cdce driver provides support for USB Host-to-Host (aka USB-to-USB)
     bridges and USB-to-Ethernet adapters based on the USB Communication
     Device Class (CDC) and Ethernet subclass, including the following:

     ⊕   Acer Labs USB 2.0 Data Link
     ⊕   Anker A7611
     ⊕   Club 3D Adapter LAN-Adapter (CAC-1420)
     ⊕   DIEWU USB-DW8152
     ⊕   G.Mate YP3X00
     ⊕   Huawei E5573s-320s
     ⊕   Motorola USBNET
     ⊕   NetChip EthernetGadget
     ⊕   Prolific PL-2501
     ⊕   Realtek RTL8152B, RTL8156, and RTL8156B Ethernet controllers
     ⊕   Sharp Zaurus

     The USB bridge appears as a regular network interface on both sides,
     transporting Ethernet frames.

     For more information on configuring this device, see ifconfig(8).

     USB 1.x bridges support speeds of up to 12Mbps, USB 2.0 speeds of up to
     480Mbps, and USB 3.0 speeds of up to 5Gbps.

     Packets are received and transmitted over separate USB bulk transfer
     endpoints.

     The cdce driver does not support different media types or options.

DIAGNOSTICS
     cdce%d: no union descriptor  The driver couldn't fetch an interface
     descriptor from the USB device.  For a manually added USB vendor/product,
     the CDCE_NO_UNION flag can be tried to work around the missing
     descriptor.

     cdce%d: no data interface
     cdce%d: could not read endpoint descriptor
     cdce%d: unexpected endpoint
     cdce%d: could not find data bulk in/out  For a manually added USB
     vendor/product, these errors indicate that the bridge is not compatible
     with the driver.

     Also see usbnet(4) for diagnostics.

SEE ALSO
     arp(4), intro(4), netintro(4), usb(4), usbnet(4), ifconfig.if(5),
     ifconfig(8)

     Universal Serial Bus Class Definitions for Communication Devices,
     http://www.usb.org/developers/devclass_docs/usbcdc11.pdf.

     Data sheet Prolific PL-2501 Host-to-Host Bridge/Network Controller,
     http://tech.prolific.com.tw/visitor/fcabdl.asp?fid=20679530.

HISTORY
     The cdce device driver first appeared in OpenBSD 3.6 and NetBSD 3.0.

AUTHORS
     The cdce driver was written by Craig Boston <craig@tobuj.gank.org> based
     on the aue(4) driver written by Bill Paul <wpaul@windriver.com> and
     ported to OpenBSD by Daniel Hartmeier <dhartmei@openbsd.org>.

CAVEATS
     Many USB devices notoriously fail to report their class and interfaces
     correctly.  Undetected products might work flawlessly when their vendor
     and product IDs are added to the driver manually.

NetBSD 10.99                   November 5, 2023                   NetBSD 10.99