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UMODEM(4)		 BSD Kernel Interfaces Manual		     UMODEM(4)

NAME
     umodem — USB modem support

SYNOPSIS
     device umodem
     device ucom

DESCRIPTION
     The umodem driver provides support for USB modems in the Communication
     Device Class using the Abstract Control Model.  These modems are basi‐
     cally standard serial line modems, but they are accessed via USB instead.
     They support a regular AT command set.  The commands can either be multi‐
     plexed with the data stream or handled through separate pipes.  In the
     latter case the AT commands have to be given on a device separate from
     the data device.

     The device is accessed through the ucom(4) driver which makes it behave
     like a tty(4).

SEE ALSO
     tty(4), ucom(4), usb(4)

HISTORY
     The umodem driver appeared in NetBSD 1.5.	This manual page was adopted
     from NetBSD by Tom Rhodes ⟨trhodes@FreeBSD.org⟩ in April 2002.

BUGS
     Only modems with multiplexed commands and data are supported at the
     moment.

BSD			       November 20, 2006			   BSD

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