Terminal adapter
(重定向自ISDN modem)
In ISDN terminology, a terminal adapter or TA is a device that connects a terminal (computer) to the ISDN network.
The TA therefore fulfills a similar function to the ones a modem has on the POTS network, and is therefore sometimes called an ISDN modem. The latter term, however, is partially misleading as there is no modulation or demodulation performed.