I'd be 99% certain that this can't be used with a TCL cable modem.
In most routers with built in ADSL modem the router only operates between the ADSL connection and LAN, you can't use an external ethernet device such as a cable modem.
I think I asked this with our netgear DG834G a while ago, but the answer that I got back from everyone was that it needed to have a physical WAN or Router plug on the back of the router. I hink thats what I got back.
The only thing you could do is use the 604 as a wireless bridge, and configure your static IP on the Wireless interface on your PC. However it's far from ideal.
Again to re-iterate, I recommend you get a Linksys WRT54GL, load DD-WRT, and you would be done!.
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