when looking into the 3G-324M protocol i noticed it currently seems to work over max one 64 kbps channel. There was a line saying that the use of several channels to enchance preformance was something for further study. the document containing this info was from 1999 and the latest released. How can i find out if any study has been done about this? And seeing how this was the latest version i can assume that offically still only one channel is used?