The System Link Cable is a 20' CAT5 Ethernet crossover cable, and is used primarily to link 2 Xboxes together.
If you plan to link more than 2 XBoxes together, you could still use System Link cables.
You would simply want to use a switch/hub that supported auto-crossover detection, like my SMC7004ABR router does.
That way, you don't have to worry about having straight-through or crossover cables. The switch/hub takes care of all that.
A *VERY* nice feature.
Without crossover detection, tho, you'll need to use straight-through cables.
IMHO, *ALL* SOHO level networking equipment should support auto-crossover.
BTW: Check the
BIG LIST - Xbox Deals thread for some cheap prices on long crossover cables.