System and method for processing an input signal communicated on a telephone line

A POTS splitter for processing an input signal communicated on a telephone line, the input signal comprising an analog telephone signal below approximately 4 kHz, tax/billing tones at either approximately 12 kHz or approximately 16 kHz, and a digital data signal above approximately 25 kHz, the POTS splitter comprising:

• a first filter operable to receive the input signal and to pass a first signal substantially comprising the tax/billing tones;
• a second filter operable to receive the input signal and to pass a second signal substantially comprising the telephone and data signals;
• a third filter operable to receive the second signal and to pass a third signal substantially comprising the telephone signal according to an input capacitance of a fourth filter that limits the ability of the third filter to pass the tax/billing tones.

A method for processing an input signal communicated on a telephone line, the input signal comprising a first component associated with a first frequency band, a second component associated with a second frequency band higher than the first frequency band, and a third component associated with a third frequency band higher than the second frequency band, the method comprising:

• using a first filter to receive the input signal and pass a first signal substantially comprising the second component;
• using a second filter to receive the input signal and pass a second signal substantially comprising the first and third components;
• using a third filter to receive the second signal and pass a third signal substantially comprising the first component according to an input capacitance of a fourth filter that limits the ability of the third filter to pass the second component.

Circuitry for processing an input signal communicated on a telephone line, the input signal comprising a first component associated with a first frequency band, a second component associated with a second frequency band higher than the first frequency band, and a third component associated with a third frequency band higher than the second frequency band, when operated the circuitry operable to:

• use a first filter to receive the input signal and pass a first signal substantially comprising the second component;
• use a second filter to receive the input signal and pass a second signal substantially comprising the first and third components;
• use a third filter to receive the second signal and pass a third signal substantially comprising the first component according to an input capacitance of a fourth filter that limits the ability of the third filter to pass the second component.