ISDN-based high speed communication system

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition facsimile and modem functions on said data stored in said shared memory;
• a direct memory access (DMA) interrupt and refresh controller coupled to said protocol processor for controlling the transfer of data to and from said terminal computer and said ISDN interface to said shared memory;
• and
• wherein said protocol processor, said digital signal processor and said computer interface circuit are each coupled to address and data bus buffers, said ISDN interface further comprising at least one arbitration circuit to selectively enable said address and data buffers.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• and
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• wherein said digital signal processor performs said modem function by scaling and converting incoming digital data from u-Law or a-Law format to a linear digital format, whereby said digital signal processor is used to convert digital data in the EMS memory directly to digital data representing the analog signal.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• and
• an expanded memory addressing interface coupled to said shared memory device and said computer interface circuit, said terminal computer being operable to access said shared memory device using expanded memory address.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• and
• wherein said protocol processor, said digital signal processor and said terminal computer each comprise programmable input/output (I/O) pins and are operable to use corresponding ones of said I/O pins to interrupt each other.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• and
• an arbitration circuit for arbitrating accesses to said shared memory device by said protocol processor, said terminal computer, and said digital signal processor.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• and
• a second serial communications circuit configured to employ link access protocols for controlling link access procedures associated with said ISDN.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• and
• an ISDN U interface detachably mountable on a card comprising said shared memory device, said computer interface circuit, said protocol processor, said serial communications circuit, said ISDN interface, and said digital signal processor, said ISDN U interface comprising line protection circuitry and a U interface control circuit to provide a direct connection between said card and a two-binary, one-quaternary (2B1Q) U interface line from a central office couple to said ISDN interface, said U interface control circuit being operable to receive data from said card over said ISDN bus, to encode and transmit said card data to said central office, and to decode data received from said central office and supply said central office data to said ISDN bus.

A system for interfacing a terminal computer with an integrated services digital network (ISDN) comprising:

• a shared memory device;
• a computer interface circuit for coupling said terminal computer to said shared memory device;
• a protocol processor coupled to said shared memory device;
• a serial communications circuit coupled to said protocol processor;
• an ISDN interface for transferring data from said serial communications circuit to said shared memory under control of said protocol processor;
• a digital signal processor coupled to said shared memory performing at least one of a plurality of operations comprising data compression, data encryption, voice recognition, facsimile and modem functions on said data stored in said shared memory;
• wherein said digital signal processor performs said modem function by scaling and converting incoming digital data from u-Law or a-Law format to a linear digital format, whereby said digital signal processor is used to convert digital data in the EMS memory directly to digital data representing the analog signal;
• wherein said protocol processor, said digital signal processor, and said computer interface circuit are each coupled to address and data bus buffers;
• a direct memory access (DMA) interrupt and refresh controller coupled to said protocol processor for controlling the transfer of data to and from said terminal computer and said ISDN interface to said shared memory;
• an arbitration circuit for arbitrating accesses to said shared memory device by said protocol processor, said terminal computer, and said digital signal processor and to selectively address said address and data buffers;
• a rate adaption circuit for allowing a serial communication port coupled to said ISDN interfacing system to transfer data over said ISDN;
• and
• an ISDN U interface detachably mountable on a card comprising said shared memory device, said computer interface circuit, said protocol processor, said serial communications circuit, said ISDN interface, and said digital signal processor, said ISDN U interface comprising line protection circuitry and a U interface control circuit to provide a direct connection between said card and a two-binary, one-quaternary (2B1Q) U interface line from a central office couple to said ISDN interface, said U interface control circuit being operable to receive data from said card over said ISDN bus, to encode and transmit said card data to said central office, and to decode data received from said central office and supply said central office data to said ISDN bus.