Originally posted by HBK
I agree, you can. It won't be easy at times, but it will be do'able. I hear the netcode for Q3 is good, and it's been tweaked(if I remember correctly). If you're only concerned with a 4 player(small) game that should help to. Stick to dedicated servers(they're usually the best) and of course those close to you. Maybe try and find friends or other people who also have 56K.
Host a game and you'll always have the lowest ping.
Good luck, have fun.
quake 3 and good netcode? HA
quake 3 is a definite LPB game, look at Half-Life, that is good netcode