The IMBD FAQ page for Terra Nova has the following -
How can the commander communicate with the alternate 2149 if it's a one way portal and in a different timeline?
According to creator Craig Silverstein, the commander can communicate with the people in 2149 only while the portal is open . Only while it is open can he order more supplies, communicate info back and forth. The main drawback with this is that if he orders medical supplies, he has to wait till the next opening to get them.
(So, does this mean the trip isn't really 'one-way'?)
