Samba + Radius

Hi I have one group of samba servers what I try to configure to auth. the windows 7 workstations using one central radius server. I found documentation about how to make other way around - like radius to use samba or krb database, but I don't want that – (In the next stage this radius server will be used by other network equipment too - so I don’t want my Cisco router to use samba database for auth :) ) Is any way how can I configure my samba servers to use one radius auth server ? Thank You, Szilard Gyorgy