rum driver troubles

i have a problem: my usb wi-fi adapter "Edimax EW-7318USG" is said to be supported in FreeBSD by the "rum" driver. In my kernel it is supported by default, as i have the following lines in a config:
device ehci
device uhci
device ohci
device usb
device rum
device wlan
device wlan_amrr


More than that, in system load log i can find the adapter load entry (according to the name of chip, on which this adapter is based on). But somehow "ifconfig" doesn't give a proper name of "rum0" interface. as i type:
ifconfig rum0 create
i receive an error (currently, i don't have the exact text of message, but if it is needed - I'll post it this evening). What should i do to make this interface appear?

I've used examples from "man rum" (http://www.freebsd.org/cgi/man.cgi?query=rum&sektion=4&manpath=FreeBSD+7.0-RELEASE). while trying to execute them - received messages about the absence of "rum0" interface.
 
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