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A terminal adapter (TA) is a device that allows a terminal to be connected to an interface on which it can not be operated directly.
ISDN
In ISDN terminology, a terminal adapter or TA is a device that connects a terminal (computer) to the ISDN network.
Mobile Networks
In Mobile networks, the terminal adapter is used by the Terminal equipment to access the Mobile termination, using AT commands.
Automation industry
In the automation industry, a terminal adapter is a passive device that converts a connector like the 8P8C (RJ-45) modular connector or 9 pin D-Sub into a terminal block to facilitate wiring. It is often used when daisy-chain wiring is necessary on a multi-node serial communication network like RS-485 or RS-422.