Combined analog and digital communications device

A communications device, comprising:

• a first connector adapted for coupling to a POTS telephone line;
• a second connector adapted for coupling to an ISDN telephone line and configured to provide an ISDN U interface;
• a third connector adapted for coupling to an ISDN telephone line and configured to provide an ISDN S/T interface;
• a digital signal processing (DSP) core, wherein the DSP core is configured to perform:
• analog modem functions in an analog transfer mode;
• ISDN signal processing functions along with ISDN S/T and U interface functions during an ISDN U transfer mode;
• and
• ISDN signal processing functions and ISDN S/T interface functions during an ISDN S/T transfer mode;
• a digital data path multiplexer coupled to the DSP core, wherein the digital data path multiplexer includes autosense logic determines a data transfer mode, and wherein the data transfer mode is:
• the analog transfer mode when the first connector is coupled to a POTS telephone line;
• the ISDN U transfer mode when the second connector is coupled to an ISDN telephone line;
• and
• the ISDN S/T transfer mode functions when the third connector is coupled to an ISDN telephone line;
• a memory unit coupled to the DSP core and configured to store programs and data;
• and
• interface logic, wherein the interface logic is coupled between the digital data multiplexer and the first, second, and third connectors, and wherein the interface logic receives digital signals produced by the DSP core, produces output signals, and provides the output signals to:
• the first connector when the first connector is coupled to a POTS telephone line;
• the second connector when the second connector is coupled to an ISDN telephone line;
• and
• the third connector when the third connector is coupled to an ISDN telephone line.

A communications device, comprising:

• a first connector adapted for coupling to a POTS telephone line;
• a second connector adapted for coupling to an ISDN telephone line and configured to provide an ISDN U interface;
• a third connector adapted for coupling to an ISDN telephone line and configured to provide an ISDN S/T interface;
• a digital signal processing (DSP) core, wherein the DSP core is configured to perform analog modem functions in an analog transfer mode, and wherein the DSP core is configured to perform ISDN signal processing functions along with ISDN S/T and U interface functions during an ISDN U transfer mode, and wherein the DSP core is configured to perform ISDN signal processing functions and ISDN S/T interface functions during an ISDN S/T transfer mode;
• a digital data path multiplexer coupled to the DSP core, wherein the digital data path multiplexer includes autosense logic which monitors signals received from a telephone line connected to one of the first, second, and third connectors, and wherein the autosense logic determines a data transfer mode, and wherein the data transfer mode is:
• the analog transfer mode when signals are received from the first connector;
• the ISDN U transfer mode when signals are received from the second connector;
• and
• the ISDN S/T transfer mode when signals are received from the third connector;
• a memory unit coupled to the DSP core and configured to store programs and data;
• and
• interface logic, wherein the interface logic is coupled between the digital data multiplexer and the first, second, and third connectors, and wherein the interface logic receives digital signals produced by the DSP core, produces output signals, and provides the output signals to:
• the first connector when the first connector is coupled to a POTS telephone line;
• the second connector when the second connector is coupled to an ISDN telephone line;
• and
• the third connector when the third connector is coupled to an ISDN telephone line.