0 Replies; Views. Icon Aug 03 PM; By: Drivers · Icon. New Replies, Icon Sweex External K USB ISDN Adapter · Drivers · Icon · 0 Replies; The external USB ISDN adapter is an ideal solution if you cannot or do not want to use an internal card. The adapter is simple to connect to the. Brand:Sweex, Product:Modem, Model: CBOS: Windows XP. Sweex External K USB ISDN Adapter CB Driver Windows XP was collected from.