hello there, i am a newbie with cisco routers. i was able to connect to 2 buildings using 1600 on the one end and a 1700 series router on the other end thru a copper lease line. i just found a cisco 878 router in the market and it has a g.shdsl wan port, can i use it on both ends? what would be the requirements? is the copper lease line enough? thank you so much in advance.