MICROCOMPUTER INTEGRATING A DIGITAL SUBSCRIBER TERMINAL FOR AN INTEGRATED SERVICE DIGITAL NETWORK

摘要

ABSTRACT OF THE DISCLOSUREA microcomputer integrates a Digital SubscriberTerminal (DST) adapted to an Integrated Services DigitalNetwork (ISDN). In addition to the electronic circuitboards that ensure all the normal data processing andmanagement functions (central processing unit, input/outputcircuits, ROM and RAM circuits), the microcomputer isequipped with an additional set of circuit boards forinterfacing with an ISDN system, so as to constitute amicrocomputer-contained DST for an ISDN. According to theinvention, the management and switching of data concerningthe ISDN system are provided by the additional set ofcircuits, so that the DST function is achieved withoutcalling on the resources of the microcomputer's centralprocessing unit. In this way, the essential telephoneswitching function is obtained without calling on the PC'scentral processing unit, while the integration of the DSTwithin the PC makes it possible to benefit from thecomputer's data processing functions with a minimum amountof equipment for a maximum number of functions.