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TNC -- a terminal node controller (TNC) is a device used by amateur radio operators to participate in AX.25 packet radio networks. It is similar in function to the Packet Assembler/Disassemblers used on X.25 networks, with the addition of a modem to convert baseband digital signals to audio tones.

The TNC was originally developed by Doug Lockhart (VE7APU), of Vancouver, British Columbia, and popularized by TAPR with the TNC-1 and TNC-2.

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