Answer Posted / silpa
The purpose of a Terminal Adapter is to connect items of equipment that are not ISDN-aware to the ISDN network.
An ISDN telephone, for example, is ISDN-aware, and can be connected directly to the ISDN network.
The serial port on a PC, on the other hand, is not ISDN-aware, and will therefore require a Terminal Adapter to provide the appropriate interface between the PC and the ISDN network.

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