| 摘要 |
An integrated services digital network (ISDN) terminal adapter comprises: a terminal adapter board within a personal computer (PC), the terminal adapter (TA) board including a digital signal processor (DSP) for carrying out modulation-demodulation of a modem and data processing for ISDN and a dial access arrangement (DAA) utilizing DSP as a modem function; and a digital service unit (DSU) outside the PC, employing a plurality of analog port interfaces and a plurality of S/T interfaces, the analog port interface and the S/T interface being connected to the TA board and, in addition, performing interfacing with the U point of an ISDN circuit, where various functions of the DSU analog port interface re controlled by a tone generation function of the TA board through a telephony application interface (TAPI) between a communication application and an operating system (OS).
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