As far as I can tell based on a search of the web, TCDconnect is a service of the Trinity College in Dublin, Ireland. As such, it is a proprietary service or facility, and there are likely not many people on this site who know much about it unless they've been students there.
Did you look through the documentation provided by TCD? http://isservices.tcd.ie/network/tcdconnect.php
I didn't read it, but there is a guide to the connection process here http://isservices.tcd.ie/network/tcdconnect-process.php
for both wireless and wired connections.