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NAME
       cdce — USB Communication Device Class Ethernet driver


SYNOPSIS
       To compile this driver into the kernel, place the following lines in your kernel configuration file:

             device uhci
             device ohci
             device usb
             device cdce

       Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

             if_cdce_load="YES"


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

       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, and USB 2.0 speeds of up to 480Mbps.

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

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


HARDWARE
       The following devices are supported by the cdce driver:

       •   Prolific PL-2501 Host-to-Host Bridge Controller
       •   Sharp Zaurus PDA
       •   Terayon TJ-715 DOCSIS Cable Modem


DIAGNOSTICS
       cdce%d: no union descriptor  The driver could not 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.

       cdce%d: watchdog timeout  A packet was queued for transmission and a transmit command was issued, however
       the device failed to acknowledge the transmission before a timeout expired.

       cdce%d: no memory for rx list -- packet dropped!  Memory allocation through MGETHDR or MCLGET failed, the
       system is running low on mbufs.

       cdce%d: abort/close rx/tx pipe failed
       cdce%d: rx/tx list init failed
       cdce%d: open rx/tx pipe failed
       cdce%d: usb error on rx/tx


SEE ALSO
       arp(4), intro(4), netintro(4), usb(4), 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, NetBSD 3.0 and FreeBSD 6.0.


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.

Debian                                         September 17, 2005                                        CDCE(4)