ASI, Asynchronous serial interface

REF: https://en.wikipedia.org/wiki/Asynchronous_serial_interface

Asynchronous Serial Interface, or ASI, is a physical (connector and electrical) definition for serial data over 75-ohm coaxial cable at rates at or less than 270 megabits per second. Electrically, the signal is typically around 1 volt.^[1]

ASI has one purpose only: the transmission of an MPEG Transport Stream (MPEG-TS).^[2] [3] ASI is designed for that one purpose: the transport of the MPEG transport stream over coaxial cable, usually as part of its run within a transmission facility before conversion to fiber or wireless carriage.