DTN 2 way to space dual carriage way on one road

[Amali De Silva - Mitchell]

I listened foe several hours to the CNN broad cast of the mission around the moon.

I heard the DTN as they chatted into space. 

What I want to know is can't we have 2 parallel DTN lines. Each line is exclusive to a one way. Similar to a dual carriage way road. 

Each line could seamlessly talk it wa only when they changes ove there was a delay..Hence if each has their own we listen to one channel and speak from the other 2 streams rather than switching 

Houda is this possible   ? 

Amali