Ethernet Connection Drop issue

I am having trouble when it's actually ethernet card is realtec RTL8139\810x,i'm connected via university using telnet.the internet is falling every 5-20 minutes...
My connection drops on average about 15mins, with torrent, skype, and msn running. it's really annoying to have to troubleshoot every 15-20mins!!.. anyone found a solution to this??

What ethernet card you have, what router model, firmware and the rest of the obvious network information and anything else pertinent about this issue, the more detail the better

mod may want to merge this thread with about 2 others, just from today alone, and probably a few more could be found just from the past week. Am wondering if this is really a big issue or is it all user/system/network specific.