An underground alternative to the wired Internet
Data Interfaces for Wireless Communications
Data must be moved from the comptuer system, transformed into a "wireless friendly" bit stream, and fed into the radio.  This section will focus on how this is done, and the equipment performing this task.

Packet Modems

YAM 9k6 - Yet Another 9k6 Modem, a very nice project to build and get you onto 9600 baud packet.
TNC/Radio/Computer Interfaces
TNC to Radio Interfaces
TNC to Computer Interfaces