Microcom 226 Users Guide - Manual (Page 63)

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TXD (Transmit Data) - An essential signal that carries data from the DTE to the DCE for 2-
way RS-232 serial communication. Also known as TX and TD.
USB (Universal Serial Bus) - A high-speed asynchronous serial interface, typically
transfers up to 12M bits/second, used for connecting host computers to various peripherals.