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Unfortunately ADSL modem routers will not work with cable. I'd suggest you ebay it, and instead buy your self just a straight forward stand alone router. If you ever go back to ADSL the router woudl work fine, all you'd have to do is connect and adsl modem to the router.
There's lots of suitable routers out there. Linksys seems especially popular for most CF users, although D-link, and netgeear are also good too.