Cisco CLI question

Hello there, i am having an issue that i hope someone here might have an answer for. My current setup is a WRT54G wireless router, running off a port to a hub that then repeates to two PC’s. I have been wanting to learn the CLI of this router, and i have tried using HyperTerminal, Putty, and the Windows Command Line to telnet/ssh into the router and i get errors stating i cannot connect. I have been thus far unable to locate any documentation online stating the particular routers compatability with CLI, any help here would be very appreciated. Wanting to dig into some command line interface.

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