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CDCE(4)		       FreeBSD Kernel Interfaces Manual		       CDCE(4)

NAME
     cdce -- USB Communication Device Class Ethernet driver

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

	   device uhci
	   device ohci
	   device usb
	   device cdce

	  Alternatively, to load the
     cdce driver 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 end-
     points.

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

HARDWARE
     The following devices are supported by the	cdce driver:

     +o	 Prolific PL-2501 Host-to-Host Bridge Controller
     +o	 Sharp Zaurus PDA
     +o	 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 descrip-
     tor.

     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 ven-
     dor/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.

FreeBSD	6.0		      September	17, 2005		   FreeBSD 6.0

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS | CAVEATS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=cdce&sektion=4&manpath=FreeBSD+6.0-RELEASE>

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