If you have the same phoneline in yoru office a syou do downstairs, meanign the same number is wired up, you can go with phoneline networking equipment.

I recommend linksys as they are easy to configure, and work well.

You can then share your cable connection with both computers without interrupting your telephone service.

Best part is, you only need a phoneline router, and one phoneline network card for your computer. the downstairs system will still use its ethernet card to connect to the router.

E-mail me if you want me to work up some more detailed information for you.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U