Thank you Lisa. So it sounds like I would need to leave the current modem installed in this room to maintain the land-line phone system, and also continue to feed the router.
Then, add a second modem in the other room for direct internet connectivity? For security and connectivity reasons, I prefer that the new connection also be direct wired, and not rely on a wireless connection.
Would it be best to obtain that additional modem from Cox, and would there be any complications with two modems connected in the same house?