Skip the intro - FF to 5:14 (but think about clicking the Pig).
Actually TNC-Pi 9.6k - Mark Griffith KD0QYN has upgraded the TNC Pi to 9600 bps... if you're signal is strong enough. Lots of details in this talk that puts the P back in TAPR.
Radio Rating: C. Keep in mind that this is not rating the quality of the program, just how much you lose (or keep) without the video. So lots of charts and graphs, but pretty well explained.