Patent ID: 7804888

Claim:
A system for providing an uninterrupted data connection between a client device and a data network via a Central Office (CO) when a Digital Subscriber Line (DSL) connection between the client device and the data network fails, comprising: a client-side sub-system coupled to the client device, said client-side sub-system comprising: a DSL modem modulating data input from said client device to a DSL band signal; a voice-band modem modulating data input from said client device to a voice-band-frequency signal; an amplitude modulator/demodulator, coupled to said voice-band modem, upshifting said voice-band-frequency signal to a shifted signal having a frequency higher than voice-band frequency; an interface, coupled to said DSL modem and said amplitude modulator/demodulator, routing one of said DSL band signal from said DSL modem and said shifted signal to said CO; and a controller configured to sense a failure of the DSL connection and, responsive to sensing the failure of the DSL connection, to switch the data connection from utilization of the DSL modem to utilization of said voice-band modem and said amplitude modulator/demodulator, said switching comprising configuring said interface to route said shifted signal instead of said DSL band signal from said DSL modem.